fix(user-flow): close offline-queue, export, session, ban & realtime gaps

Comprehensive user-flow review across guest/host/admin roles, then fixes with
e2e regression guards. Highlights:

- Offline upload queue auto-resumes on reconnect: network errors keep items
  pending (not error), 4xx are terminal (no infinite retry), quota exhaustion
  returns a distinct 413; queue cap + dedup.
- Export lifecycle: release atomically locks uploads; reopen invalidates and
  re-release regenerates the keepsake; workers claim their job atomically so a
  reopen->re-release can't corrupt the ZIP; startup re-spawns interrupted
  exports.
- Sessions slide on activity (no 30-day cliff); JWT expiry deferred to the
  revocable session row; sign-out-everywhere + revoke-on-PIN-reset.
- Ban always hides content (v_feed / find_visible_media / export filter
  is_banned) but stays a read-only ban per USER_JOURNEYS §10 — sessions are
  not revoked, read access + keepsake download preserved.
- Realtime: server-clock SSE delta cursor; event-closed/opened drive the UI
  live; feed_delta rate-limited; like returns {liked, like_count} to fix
  multi-device drift; lightbox live comments; diashow delta backfill.
- Forgotten-PIN in-app request flow; simultaneous same-name join returns 409;
  quota increment is transactional; operator floor.

Adds e2e/specs/10-flow-review/ (offline resume, export integrity, deterministic
anti-race guard) and updates existing specs for the new contracts.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.env.example

@@ -4,11 +4,17 @@ DOMAIN=my-event.example.com
 
 # ── App server ────────────────────────────────────────────────────────────────
 APP_PORT=3000
+# Set to `production` in real deployments. This activates the secret guard that
+# refuses to boot with placeholder JWT_SECRET / ADMIN_PASSWORD_HASH values.
+# (docker-compose.yml already sets APP_ENV=production for the app service.)
+APP_ENV=production
 
 # ── Database ──────────────────────────────────────────────────────────────────
-DATABASE_URL=postgres://eventsnap:secret@db:5432/eventsnap
+# Set a strong password and keep it in sync between DATABASE_URL and
+# POSTGRES_PASSWORD. Generate one with: openssl rand -hex 24
+DATABASE_URL=postgres://eventsnap:CHANGE_ME_use_a_strong_password@db:5432/eventsnap
 POSTGRES_USER=eventsnap
-POSTGRES_PASSWORD=secret
+POSTGRES_PASSWORD=CHANGE_ME_use_a_strong_password
 POSTGRES_DB=eventsnap
 
 # ── Authentication ────────────────────────────────────────────────────────────
@@ -26,6 +32,9 @@ EVENT_SLUG=max-maria-2026
 
 # ── Storage ───────────────────────────────────────────────────────────────────
 MEDIA_PATH=/media
+# Export archives (Gallery.zip / Memories.zip). MUST be outside MEDIA_PATH —
+# /media is publicly served, so exports here would be downloadable without auth.
+EXPORT_PATH=/exports
 
 # ── Upload limits ─────────────────────────────────────────────────────────────
 DEFAULT_MAX_IMAGE_SIZE_MB=20

.env.test

@@ -1,45 +0,0 @@
-# ── Domain ────────────────────────────────────────────────────────────────────
-# Public domain Caddy will serve and obtain a TLS certificate for.
-DOMAIN=my-event.example.com
-
-# ── App server ────────────────────────────────────────────────────────────────
-APP_PORT=3000
-
-# ── Database ──────────────────────────────────────────────────────────────────
-DATABASE_URL=postgres://eventsnap:secret@db:5432/eventsnap
-POSTGRES_USER=eventsnap
-POSTGRES_PASSWORD=secret
-POSTGRES_DB=eventsnap
-
-# ── Authentication ────────────────────────────────────────────────────────────
-# Generate with: openssl rand -hex 64
-JWT_SECRET=change_me_to_a_random_64_byte_hex_string
-SESSION_EXPIRY_DAYS=30
-
-# Admin dashboard password (bcrypt hash).
-# Generate with: htpasswd -bnBC 12 "" yourpassword | tr -d ':\n'
-ADMIN_PASSWORD_HASH=$2y$12$placeholder_replace_me
-
-# ── Event ─────────────────────────────────────────────────────────────────────
-EVENT_NAME=Max & Maria's Wedding
-EVENT_SLUG=max-maria-2026
-
-# ── Storage ───────────────────────────────────────────────────────────────────
-MEDIA_PATH=/media
-
-# ── Upload limits ─────────────────────────────────────────────────────────────
-DEFAULT_MAX_IMAGE_SIZE_MB=20
-DEFAULT_MAX_VIDEO_SIZE_MB=500
-
-# ── Rate limiting ─────────────────────────────────────────────────────────────
-DEFAULT_UPLOAD_RATE_PER_HOUR=10
-DEFAULT_FEED_RATE_PER_MIN=60
-DEFAULT_EXPORT_RATE_PER_DAY=3
-
-# ── Capacity ──────────────────────────────────────────────────────────────────
-DEFAULT_ESTIMATED_GUEST_COUNT=100
-# Fraction of total storage that triggers the "low storage" warning (0.0–1.0)
-DEFAULT_QUOTA_TOLERANCE=0.75
-
-# ── Workers ───────────────────────────────────────────────────────────────────
-COMPRESSION_WORKER_CONCURRENCY=2

.gitignore

@@ -1,5 +1,7 @@
 # Environment secrets — never commit the real .env
 .env
+# Stale local scratch copy of .env.example; nothing in the test stack reads it.
+.env.test
 
 # Rust
 backend/target/
@@ -20,6 +22,9 @@ e2e/playwright-report/
 e2e/test-results/
 e2e/.cache/
 e2e/.env.test
+# Playwright artifacts when run from the repo root instead of e2e/
+/test-results/
+/playwright-report/
 
 # OS
 .DS_Store

Caddyfile

@@ -1,26 +1,42 @@
 {$DOMAIN} {
-    encode zstd gzip
+	# Compress everything EXCEPT the SSE stream — gzip buffering delays
+	# "real-time" likes/comments until the ~30s keep-alive tick.
+	@compressible not path /api/v1/stream
+	encode @compressible zstd gzip
 
-    # SvelteKit frontend — static assets with long-lived cache (content-hashed filenames)
-    @hashed_assets path_regexp hashed /_app/immutable/.*\.[a-f0-9]{8,}\.(js|css|woff2)$
-    header @hashed_assets Cache-Control "public, max-age=31536000, immutable"
+	# Site-wide security headers (defense-in-depth). HSTS is free since Caddy
+	# already terminates TLS. nosniff also covers all of /media/*.
+	header {
+		Strict-Transport-Security "max-age=31536000; includeSubDomains"
+		X-Content-Type-Options "nosniff"
+		X-Frame-Options "DENY"
+		Referrer-Policy "strict-origin-when-cross-origin"
+	}
 
-    # Media previews and thumbnails
-    @previews path /media/previews/* /media/thumbnails/*
-    header @previews Cache-Control "public, max-age=3600"
+	# SvelteKit frontend — static assets with long-lived cache (content-hashed filenames)
+	@hashed_assets path_regexp hashed /_app/immutable/.*\.[a-f0-9]{8,}\.(js|css|woff2)$
+	header @hashed_assets Cache-Control "public, max-age=31536000, immutable"
 
-    # Original media files (private — only host can download)
-    @originals path /media/originals/*
-    header @originals Cache-Control "private, max-age=86400"
+	# Preview/thumbnail images. These are now served by the app through a
+	# visibility-checked alias (/api/v1/upload/{id}/{preview,thumbnail}) so moderation
+	# can revoke access; direct /media/previews|thumbnails is 404-blocked at the app.
+	# Privately cacheable for a short window (the app sets the same header; this is the
+	# edge carve-out from the blanket no-store below). Kept short so a moderated image
+	# stops being served to a direct-URL holder promptly.
+	@media_api path /api/v1/upload/*/preview /api/v1/upload/*/thumbnail
+	header @media_api Cache-Control "private, max-age=300"
 
-    # API — never cache
-    @api path /api/*
-    header @api Cache-Control "no-store"
+	# API — never cache, EXCEPT the gated image routes above.
+	@api {
+		path /api/*
+		not path /api/v1/upload/*/preview /api/v1/upload/*/thumbnail
+	}
+	header @api Cache-Control "no-store"
 
-    # Route API and media requests to the Rust backend
-    reverse_proxy /api/* app:3000
-    reverse_proxy /media/* app:3000
+	# Route API and media requests to the Rust backend
+	reverse_proxy /api/* app:3000
+	reverse_proxy /media/* app:3000
 
-    # Everything else goes to SvelteKit frontend
-    reverse_proxy frontend:3001
+	# Everything else goes to SvelteKit frontend
+	reverse_proxy frontend:3001
 }

FOLLOWUPS.md

@@ -46,6 +46,90 @@ is the smallest patch.
 - [frontend/src/lib/components/Toaster.svelte](frontend/src/lib/components/Toaster.svelte) — add passthrough marker (if approach 2) or move to a portal (if approach 1)
 - [frontend/src/app.html](frontend/src/app.html) — add `<div id="modal-root">` (if approach 1)
 
+## Feed — DOM-windowing virtualization (IMPLEMENTED — residual validation owed)
+
+**Status.** Implemented in [frontend/src/lib/components/VirtualFeed.svelte](frontend/src/lib/components/VirtualFeed.svelte)
+using `@tanstack/svelte-virtual`'s `createWindowVirtualizer`. Both the **list**
+view (dynamic `measureElement` heights, keyed by upload id with `anchorTo:'start'`
+so an SSE prepend doesn't yank a scrolled-down reader) and the **grid** view
+(three measured square tiles per row) now keep only the on-screen window (+overscan)
+in the DOM instead of one node per upload. The window virtualizer scrolls the
+document, so the sticky header, pull-to-refresh, the infinite-scroll sentinel and
+the bottom nav are untouched. The earlier `content-visibility` band-aid was removed
+from `FeedListCard` (it interferes with real-height measurement), and the old
+`FeedGrid.svelte` was deleted (its sole consumer migrated to `VirtualFeed`).
+
+**Verified.** `svelte-check` 0 errors, production build clean. The integration
+follows the library's documented window-virtualizer contract (confirmed against
+`virtual-core` source: item `start` includes `scrollMargin`, `getTotalSize()`
+excludes it; the SSR path is guarded by `getScrollElement()` returning null).
+
+**Residual validation owed (needs the running app — could not be done headless).**
+- Manual scroll testing on a ~1000-item event: confirm no jank, correct scrollbar
+  size, and that an SSE `new-upload` / `feed-delta` prepend while scrolled down does
+  not jump the viewport (the `anchorTo:'start'` + id-key path).
+- `scrollMargin` re-measure when grid filter chips change the header height (handled
+  reactively via the `uploads`-length-driven effect, but unverified visually).
+- A new e2e spec that scrolls far down, likes an item via SSE, and asserts scroll
+  position is retained — the existing suite only asserts a single card is visible,
+  so it cannot catch a scroll regression.
+
+**Files.**
+- [frontend/src/lib/components/VirtualFeed.svelte](frontend/src/lib/components/VirtualFeed.svelte) — new windowing component (list + grid)
+- [frontend/src/routes/feed/+page.svelte](frontend/src/routes/feed/+page.svelte) — renders `VirtualFeed` for both views
+- [frontend/src/lib/components/FeedListCard.svelte](frontend/src/lib/components/FeedListCard.svelte) — `content-visibility` removed
+
+**Known limitations (surfaced in the post-commit review, left as-is — low impact).**
+- **Grid prepend reflows tiles.** Grid rows are index-keyed and pack 3 tiles each, so
+  an SSE `new-upload` shifts every tile by one position; `anchorTo:'start'` can only
+  anchor a scrolled grid reader when the prepend crosses a 3-item boundary (it adds a
+  *row*). List view is unaffected (one id-keyed row per upload). A fix would key rows
+  by the first tile's id and accept partial-row churn; not worth it for the rarer
+  "new upload while browsing the grid" case.
+- **Filtered grid can auto-load the whole feed.** When a grid filter matches few items
+  the `VirtualFeed` is short, so the infinite-scroll sentinel sits in-viewport and
+  `loadMore()` fires until `nextCursor` is null — pulling all pages to widen the
+  client-side search. This is pre-existing (the old `FeedGrid` had the same shape, and
+  the empty-filter copy even says "scrolle weiter"), not a virtualization regression.
+  If undesired, gate auto-load to list view or to actual user scroll.
+
+## Feed — comment deletion leaves a stale live count
+
+**Problem.** `add_comment` now broadcasts a fresh `comment_count` so feed clients patch
+the card in place, but `delete_comment` and `host_delete_comment`
+([backend/src/handlers/social.rs](backend/src/handlers/social.rs),
+[host.rs](backend/src/handlers/host.rs)) soft-delete without broadcasting any
+count/event. So a deletion leaves the count too high on every client until a full
+refetch (pull-to-refresh or an unrelated `upload-processed` merge). `toggle_like`
+already broadcasts on both add and remove, so likes are fine — the gap is
+comments-on-delete. Pre-existing, but the in-place-patch scheme makes it observable.
+
+**Fix.** Emit a `new-comment` (or a `comment-deleted`) event carrying the refreshed
+`comment_count` from both delete paths, the same best-effort way `add_comment` does;
+the frontend `patchCount(..., 'comment_count')` handler already consumes it.
+
+**Note — count ordering.** The broadcast count is read just after the (auto-committed)
+mutation, not inside it, so under concurrent likes/comments on one upload the SSE
+messages are last-write-wins. The frontend *replaces* (not increments) the count, so
+steady state is correct and self-healing; only document this if strict per-event
+ordering is ever required (then compute the count in-tx with a monotonic sequence).
+
+## Feed — per-image exact CLS reservation
+
+**Problem.** `FeedListCard` now reserves a default `aspect-[4/5]` box for photos so
+the card doesn't collapse to height 0 and reflow as images stream in (matching
+`Skeleton`). But no image dimensions are stored anywhere (not on `FeedUpload`, the
+`upload` table, or any migration), so the box is a uniform guess that crops to fit —
+the original is one tap away in the lightbox.
+
+**Acceptance criterion.** Extract image width/height during the compression worker,
+store them on `upload`, expose them on `FeedUpload`, and have the card reserve the
+*true* aspect ratio (no crop, zero shift).
+
+**Files to touch.**
+- backend: `services/compression.rs`, `models/upload.rs`, `handlers/feed.rs`, a migration
+- [frontend/src/lib/types.ts](frontend/src/lib/types.ts), [FeedListCard.svelte](frontend/src/lib/components/FeedListCard.svelte)
+
 ## Smaller nits, optional
 
 - **Auto-submit on retried 4th digit.** [recover/+page.svelte](frontend/src/routes/recover/+page.svelte), [join/+page.svelte](frontend/src/routes/join/+page.svelte) — after a wrong PIN, deleting one digit and retyping triggers an immediate submit. Backend's 3-attempts/15-min lockout makes this safe; could feel hair-trigger after a typo. Consider gating the second auto-submit per input session behind an explicit button press.

README.md

@@ -77,6 +77,7 @@ eventsnap/
 │   ├── svelte.config.js
 │   └── Dockerfile
 ├── docker-compose.yml
+├── docker-compose.dev.yml   # opt-in dev overlay (publishes Postgres on the host)
 ├── Caddyfile
 └── .env.example
 ```
@@ -93,9 +94,9 @@ eventsnap/
 ### Deploy on a fresh VPS
 
 ```bash
-# 1. Clone the repository
-git clone https://git.mc02.dev/fabi/EventSnap.git
-cd EventSnap
+# 1. Clone the repository (into a lowercase dir, matching the paths used below)
+git clone https://git.mc02.dev/fabi/EventSnap.git eventsnap
+cd eventsnap
 
 # 2. Configure environment
 cp .env.example .env
@@ -107,6 +108,13 @@ docker compose up -d
 
 Caddy automatically obtains a Let's Encrypt certificate on first start. The app is live at `https://DOMAIN` within ~30 seconds.
 
+> **If the site never comes up:** with `APP_ENV=production` the backend **refuses to boot** while `JWT_SECRET`/`ADMIN_PASSWORD_HASH` still hold the `.env.example` placeholders (this is deliberate — a publicly-known signing key is worse than downtime). Caddy then waits on the unhealthy `app` container and never serves. Check `docker compose logs app` — a "Refusing to start … placeholder …" line means you skipped step 2. Rotate the secrets (see below) and restart.
+
+> **Production note:** `docker compose up -d` does **not** expose the database — Postgres is reachable only on the internal Docker network. For local development where you need host access to Postgres, opt into the dev overlay explicitly:
+> ```bash
+> docker compose -f docker-compose.yml -f docker-compose.dev.yml up
+> ```
+
 ### Generate required secrets
 
 ```bash

backend/Dockerfile

@@ -20,8 +20,18 @@ FROM alpine:3.21
 
 RUN apk add --no-cache ca-certificates ffmpeg
 
+# Run as a non-root user. Pre-create and chown the media + export mount paths so
+# the fresh named volumes inherit the non-root ownership (Docker seeds an empty
+# named volume from the image directory, preserving its uid/gid) and uploads +
+# export archives can be written. Exports live OUTSIDE /media on purpose so the
+# public media ServeDir can't reach them.
+RUN addgroup -S app && adduser -S app -G app
+
 WORKDIR /app
 COPY --from=builder /app/target/release/eventsnap-backend ./
 
+RUN mkdir -p /media /exports && chown -R app:app /app /media /exports
+USER app
+
 EXPOSE 3000
 CMD ["./eventsnap-backend"]

backend/migrations/010_review_indexes.down.sql

@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS idx_comment_hashtag_hashtag;
+DROP INDEX IF EXISTS idx_comment_user;
+DROP INDEX IF EXISTS idx_upload_event_created_id;

backend/migrations/010_review_indexes.up.sql

@@ -0,0 +1,17 @@
+-- Composite feed index with an id tiebreaker so keyset pagination
+-- (ORDER BY created_at DESC, id DESC) stays index-covered and stable when
+-- multiple uploads share a created_at timestamp.
+CREATE INDEX idx_upload_event_created_id
+    ON upload(event_id, created_at DESC, id DESC)
+    WHERE deleted_at IS NULL;
+
+-- A user's own comments (moderation, "who commented"). The sibling
+-- idx_upload_user already exists for uploads; comment(user_id) was missing.
+CREATE INDEX idx_comment_user
+    ON comment(user_id)
+    WHERE deleted_at IS NULL;
+
+-- Hashtag filtering over comments — mirrors idx_upload_hashtag_hashtag, which
+-- only covered upload_hashtag.
+CREATE INDEX idx_comment_hashtag_hashtag
+    ON comment_hashtag(hashtag_id);

backend/migrations/011_ban_hides_and_pin_reset.down.sql

@@ -0,0 +1,25 @@
+DROP TABLE IF EXISTS pin_reset_request;
+
+-- Restore v_feed without the is_banned filter.
+CREATE OR REPLACE VIEW v_feed AS
+SELECT
+    u.id,
+    u.event_id,
+    u.user_id,
+    usr.display_name             AS uploader_name,
+    usr.is_banned,
+    usr.uploads_hidden,
+    u.preview_path,
+    u.thumbnail_path,
+    u.mime_type,
+    u.caption,
+    u.created_at,
+    COUNT(DISTINCT l.user_id)    AS like_count,
+    COUNT(DISTINCT c.id)         AS comment_count
+FROM upload u
+JOIN "user" usr ON u.user_id = usr.id
+LEFT JOIN "like" l  ON l.upload_id = u.id
+LEFT JOIN comment c ON c.upload_id = u.id AND c.deleted_at IS NULL
+WHERE u.deleted_at IS NULL
+  AND usr.uploads_hidden = FALSE
+GROUP BY u.id, usr.display_name, usr.is_banned, usr.uploads_hidden;

backend/migrations/011_ban_hides_and_pin_reset.up.sql

@@ -0,0 +1,39 @@
+-- Ban now ALWAYS hides: exclude banned uploaders from the feed view. Previously ban and
+-- hide were decoupled (a host could ban without hiding), leaving a banned user's photos on
+-- the feed and baked into the export. `find_visible_media` and the export query get the
+-- same `is_banned = FALSE` filter in code.
+CREATE OR REPLACE VIEW v_feed AS
+SELECT
+    u.id,
+    u.event_id,
+    u.user_id,
+    usr.display_name             AS uploader_name,
+    usr.is_banned,
+    usr.uploads_hidden,
+    u.preview_path,
+    u.thumbnail_path,
+    u.mime_type,
+    u.caption,
+    u.created_at,
+    COUNT(DISTINCT l.user_id)    AS like_count,
+    COUNT(DISTINCT c.id)         AS comment_count
+FROM upload u
+JOIN "user" usr ON u.user_id = usr.id
+LEFT JOIN "like" l  ON l.upload_id = u.id
+LEFT JOIN comment c ON c.upload_id = u.id AND c.deleted_at IS NULL
+WHERE u.deleted_at IS NULL
+  AND usr.uploads_hidden = FALSE
+  AND usr.is_banned = FALSE
+GROUP BY u.id, usr.display_name, usr.is_banned, usr.uploads_hidden;
+
+-- pin_reset_request: a guest who forgot their PIN (localStorage was the only copy) can ask
+-- a host to reset it in-app, instead of being permanently orphaned. One pending request per
+-- user; cleared when the host resets the PIN or dismisses it, and cascades if the user/event
+-- is removed.
+CREATE TABLE pin_reset_request (
+    id          UUID        PRIMARY KEY DEFAULT gen_random_uuid(),
+    event_id    UUID        NOT NULL REFERENCES event(id) ON DELETE CASCADE,
+    user_id     UUID        NOT NULL REFERENCES "user"(id) ON DELETE CASCADE,
+    created_at  TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    UNIQUE (user_id)
+);

backend/src/auth/handlers.rs

@@ -37,8 +37,8 @@ pub async fn join(
     Json(body): Json<JoinRequest>,
 ) -> Result<(StatusCode, Json<JoinResponse>), AppError> {
     let ip = client_ip(&headers, "unknown");
-    let rate_limits_on = config::get_bool(&state.pool, "rate_limits_enabled", true).await;
-    let join_rate_on = config::get_bool(&state.pool, "join_rate_enabled", true).await;
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let join_rate_on = config::get_bool(&state.config_cache, "join_rate_enabled", true).await;
     if rate_limits_on && join_rate_on
         && !state.rate_limiter.check(format!("join:{ip}"), 5, Duration::from_secs(60))
     {
@@ -83,7 +83,19 @@ pub async fn join(
     let pin_hash =
         bcrypt::hash(&pin, 12).map_err(|e| AppError::Internal(anyhow::anyhow!(e)))?;
 
-    let user = User::create(&state.pool, event.id, display_name, &pin_hash).await?;
+    // The pre-check above is racy: two simultaneous joins with the same name can both
+    // pass it, and the DB's unique index then rejects the loser. Map that unique
+    // violation to the same clean 409 the pre-check returns, not a generic 500.
+    let user = match User::create(&state.pool, event.id, display_name, &pin_hash).await {
+        Ok(u) => u,
+        Err(sqlx::Error::Database(db)) if db.is_unique_violation() => {
+            return Err(AppError::Conflict(format!(
+                "Der Name \"{}\" ist bereits vergeben.",
+                display_name
+            )));
+        }
+        Err(e) => return Err(e.into()),
+    };
 
     let token = jwt::create_token(
         user.id,
@@ -121,6 +133,18 @@ pub struct RecoverResponse {
     pub user_id: Uuid,
 }
 
+/// A real cost-12 bcrypt hash of a fixed dummy value, computed once and cached. Used
+/// to run a constant-time-ish verify on the "unknown display name" branch of
+/// [`recover`], so that branch costs the same as a real (user-exists) verify and can't
+/// be told apart by timing.
+fn dummy_pin_hash() -> &'static str {
+    static HASH: std::sync::OnceLock<String> = std::sync::OnceLock::new();
+    HASH.get_or_init(|| {
+        bcrypt::hash("eventsnap-dummy-not-a-real-pin", 12)
+            .expect("bcrypt hashing of a static dummy value cannot fail")
+    })
+}
+
 pub async fn recover(
     State(state): State<AppState>,
     headers: HeaderMap,
@@ -134,8 +158,8 @@ pub async fn recover(
     // every 15 minutes, indefinitely. 5 attempts per 15 minutes per (IP, name)
     // softens that into a real cost.
     let ip = client_ip(&headers, "unknown");
-    let rate_limits_on = config::get_bool(&state.pool, "rate_limits_enabled", true).await;
-    let recover_rate_on = config::get_bool(&state.pool, "recover_rate_enabled", true).await;
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let recover_rate_on = config::get_bool(&state.config_cache, "recover_rate_enabled", true).await;
     if rate_limits_on && recover_rate_on {
         let name_key = display_name.to_lowercase();
         if !state.rate_limiter.check(
@@ -158,9 +182,13 @@ pub async fn recover(
         User::find_by_event_and_name(&state.pool, event.id, display_name).await?;
 
     if users.is_empty() {
-        return Err(AppError::NotFound(
-            "Kein Benutzer mit diesem Namen gefunden.".into(),
-        ));
+        // No user with this name. Run a throwaway bcrypt verify so this branch takes
+        // the same time as the user-exists path, and return the SAME error as a wrong
+        // PIN — so "no such name" and "wrong PIN" are indistinguishable by response or
+        // timing. Display names are already public on the feed, but this still closes
+        // the /recover enumeration + timing oracle.
+        let _ = bcrypt::verify(&body.pin, dummy_pin_hash());
+        return Err(AppError::Unauthorized("PIN ist falsch.".into()));
     }
 
     for user in &users {
@@ -238,6 +266,10 @@ pub struct AdminLoginRequest {
 #[derive(Serialize)]
 pub struct AdminLoginResponse {
     pub jwt: String,
+    /// The admin's user id + display name, so the client can populate a real identity
+    /// (own-post affordances, a name on the Account page) instead of a blank session.
+    pub user_id: Uuid,
+    pub display_name: String,
 }
 
 pub async fn admin_login(
@@ -256,8 +288,8 @@ pub async fn admin_login(
     // a long-running guess campaign. 5 attempts / minute / IP is plenty for
     // honest typos.
     let ip = client_ip(&headers, "unknown");
-    let rate_limits_on = config::get_bool(&state.pool, "rate_limits_enabled", true).await;
-    let admin_rate_on = config::get_bool(&state.pool, "admin_login_rate_enabled", true).await;
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let admin_rate_on = config::get_bool(&state.config_cache, "admin_login_rate_enabled", true).await;
     if rate_limits_on && admin_rate_on
         && !state.rate_limiter.check(
             format!("admin_login:{ip}"),
@@ -325,7 +357,11 @@ pub async fn admin_login(
     let expires_at = Utc::now() + chrono::Duration::days(1);
     Session::create(&state.pool, admin_user.id, &token_hash, expires_at).await?;
 
-    Ok(Json(AdminLoginResponse { jwt: token }))
+    Ok(Json(AdminLoginResponse {
+        jwt: token,
+        user_id: admin_user.id,
+        display_name: admin_user.display_name,
+    }))
 }
 
 pub async fn logout(
@@ -335,3 +371,77 @@ pub async fn logout(
     Session::delete_by_token_hash(&state.pool, &auth.token_hash).await?;
     Ok(StatusCode::NO_CONTENT)
 }
+
+/// "Sign out everywhere" — revoke every session for the caller, not just the current one.
+/// A single leaked/kept-alive device (a shared phone, a laptop recovered via PIN) can then
+/// be cut from any of the user's devices.
+pub async fn logout_all(
+    State(state): State<AppState>,
+    auth: AuthUser,
+) -> Result<StatusCode, AppError> {
+    Session::delete_all_for_user(&state.pool, auth.user_id).await?;
+    Ok(StatusCode::NO_CONTENT)
+}
+
+#[derive(Deserialize)]
+pub struct PinResetRequestBody {
+    pub display_name: String,
+}
+
+/// A guest who forgot their PIN asks a host to reset it in-app. Unauthenticated (they
+/// can't log in without the PIN) and rate-limited. Always returns 204 regardless of
+/// whether the name exists, so it can't enumerate display names beyond what the public
+/// feed already exposes.
+pub async fn request_pin_reset(
+    State(state): State<AppState>,
+    headers: HeaderMap,
+    Json(body): Json<PinResetRequestBody>,
+) -> Result<StatusCode, AppError> {
+    let display_name = body.display_name.trim();
+    let ip = client_ip(&headers, "unknown");
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    if rate_limits_on {
+        let name_key = display_name.to_lowercase();
+        if !state.rate_limiter.check(
+            format!("pin_reset_req:{ip}:{name_key}"),
+            3,
+            Duration::from_secs(15 * 60),
+        ) {
+            return Err(AppError::TooManyRequests(
+                "Zu viele Anfragen. Bitte warte kurz und versuche es erneut.".into(),
+                None,
+            ));
+        }
+    }
+    if display_name.is_empty() {
+        return Ok(StatusCode::NO_CONTENT);
+    }
+
+    // Single statement so the existing-name and unknown-name paths do IDENTICAL work
+    // (same event+user index scans, an INSERT that matches 0 rows for an unknown name) —
+    // no timing oracle despite the always-204 contract. Admins recover via password, so
+    // they're excluded from the join and never get a reset request queued.
+    let _ = sqlx::query(
+        "INSERT INTO pin_reset_request (event_id, user_id)
+         SELECT e.id, u.id
+         FROM event e
+         JOIN \"user\" u
+           ON u.event_id = e.id
+          AND lower(u.display_name) = lower($2)
+          AND u.role <> 'admin'
+         WHERE e.slug = $1
+         ON CONFLICT (user_id) DO NOTHING",
+    )
+    .bind(&state.config.event_slug)
+    .bind(display_name)
+    .execute(&state.pool)
+    .await;
+
+    // Broadcast unconditionally (carries no per-name info) so an online host's request
+    // badge updates without revealing whether the name existed.
+    let _ = state
+        .sse_tx
+        .send(crate::state::SseEvent::new("pin-reset-requested", "{}"));
+
+    Ok(StatusCode::NO_CONTENT)
+}

backend/src/auth/jwt.rs

@@ -46,10 +46,20 @@ pub fn create_token(
 }
 
 pub fn verify_token(token: &str, secret: &str) -> Result<Claims, jsonwebtoken::errors::Error> {
+    // We deliberately do NOT enforce the JWT's own `exp`. The authoritative session
+    // lifetime lives in the `session` row (`expires_at > NOW()`), which SLIDES forward on
+    // every authenticated request (see `Session::touch_and_renew`). Enforcing the JWT's
+    // fixed +Nd `exp` here would hard-log-out an actively-used client on day N+1 even
+    // though its session was renewed — the "30-day cliff" from the review. With server-
+    // side sliding sessions, the token is a signature-checked bearer credential and its
+    // lifetime is revocable (logout / expiry / ban all delete the row), which is strictly
+    // stronger than a stateless non-revocable exp.
+    let mut validation = Validation::default();
+    validation.validate_exp = false;
     let data = jsonwebtoken::decode::<Claims>(
         token,
         &DecodingKey::from_secret(secret.as_bytes()),
-        &Validation::default(),
+        &validation,
     )?;
     Ok(data.claims)
 }

backend/src/auth/middleware.rs

@@ -1,4 +1,4 @@
-use axum::extract::{FromRequestParts, State};
+use axum::extract::FromRequestParts;
 use axum::http::request::Parts;
 use uuid::Uuid;
 
@@ -13,6 +13,10 @@ pub struct AuthUser {
     pub user_id: Uuid,
     pub event_id: Uuid,
     pub role: UserRole,
+    /// Live ban flag. Banned users keep *read* access (per USER_JOURNEYS §10), so
+    /// the base extractor does NOT reject them — write handlers and the
+    /// Require{Host,Admin} extractors enforce the ban instead.
+    pub is_banned: bool,
     pub token_hash: String,
 }
 
@@ -33,31 +37,49 @@ impl FromRequestParts<AppState> for AuthUser {
             .strip_prefix("Bearer ")
             .ok_or_else(|| AppError::Unauthorized("Ungültiges Token-Format.".into()))?;
 
-        let claims = jwt::verify_token(token, &state.config.jwt_secret)
+        // Verify the JWT's signature. Expiry is deliberately NOT enforced here (see
+        // `jwt::verify_token`) — the authoritative, sliding session lifetime lives in the
+        // `session` row read below. We also don't trust the token's role/ban claims; the
+        // live user row is authoritative, so the decoded claims aren't needed beyond this.
+        jwt::verify_token(token, &state.config.jwt_secret)
             .map_err(|_| AppError::Unauthorized("Token ungültig oder abgelaufen.".into()))?;
 
         let token_hash = jwt::hash_token(token);
 
-        let session = Session::find_by_token_hash(&state.pool, &token_hash)
+        // Single round-trip: resolve the session token to its *live* user row. A
+        // role/ban stored in the token would survive a demote/ban for the full session
+        // lifetime (up to 30d), so we always re-read the user (a demoted host loses host
+        // powers immediately). We do NOT reject banned users here — they retain read
+        // access by design; writes and host/admin actions enforce the ban downstream.
+        let user = Session::find_user_by_token_hash(&state.pool, &token_hash)
             .await
             .map_err(|e| AppError::Internal(e.into()))?
             .ok_or_else(|| AppError::Unauthorized("Sitzung nicht gefunden oder abgelaufen.".into()))?;
 
-        // Update last_seen_at in the background (fire-and-forget). Failures are
-        // non-fatal but worth surfacing — silent swallowing hides DB connection
-        // pressure that would otherwise be the first symptom of a real problem.
+        // Touch last_seen_at AND slide the session's expiry forward (fire-and-forget), so
+        // an active client's session renews instead of hitting the fixed 30-day cliff.
+        // Admin sessions keep their tighter 1-day window (they renew on activity but still
+        // lapse a day after the admin goes idle). Failures are non-fatal but worth
+        // surfacing — silent swallowing hides DB connection pressure that would otherwise
+        // be the first symptom of a real problem.
         let pool = state.pool.clone();
-        let session_id = session.id;
+        let touch_hash = token_hash.clone();
+        let expiry_days = if user.role == UserRole::Admin {
+            1
+        } else {
+            state.config.session_expiry_days
+        };
         tokio::spawn(async move {
-            if let Err(e) = Session::touch(&pool, session_id).await {
-                tracing::warn!(error = ?e, session_id = %session_id, "session touch failed");
+            if let Err(e) = Session::touch_and_renew(&pool, &touch_hash, expiry_days).await {
+                tracing::warn!(error = ?e, "session touch/renew failed");
             }
         });
 
         Ok(Self {
-            user_id: claims.sub,
-            event_id: claims.event_id,
-            role: claims.role,
+            user_id: user.id,
+            event_id: user.event_id,
+            role: user.role,
+            is_banned: user.is_banned,
             token_hash,
         })
     }
@@ -74,6 +96,9 @@ impl FromRequestParts<AppState> for RequireHost {
         state: &AppState,
     ) -> Result<Self, Self::Rejection> {
         let auth = AuthUser::from_request_parts(parts, state).await?;
+        if auth.is_banned {
+            return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+        }
         match auth.role {
             UserRole::Host | UserRole::Admin => Ok(Self(auth)),
             _ => Err(AppError::Forbidden("Nur für Hosts und Admins.".into())),
@@ -92,6 +117,9 @@ impl FromRequestParts<AppState> for RequireAdmin {
         state: &AppState,
     ) -> Result<Self, Self::Rejection> {
         let auth = AuthUser::from_request_parts(parts, state).await?;
+        if auth.is_banned {
+            return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+        }
         match auth.role {
             UserRole::Admin => Ok(Self(auth)),
             _ => Err(AppError::Forbidden("Nur für Admins.".into())),

backend/src/config.rs

@@ -6,6 +6,47 @@ use anyhow::{anyhow, Context, Result};
 /// we refuse to start with this value; otherwise we warn loudly.
 const DEV_JWT_SECRET_SENTINEL: &str = "dev_secret_do_not_use_in_production_32byteslong_aaaa";
 
+/// A secret is "placeholder-ish" if it's the shipped dev sentinel or still carries
+/// the tell-tale scaffolding substrings from `.env.example`. Length alone is not
+/// enough — the shipped `change_me_...` placeholder is >32 chars.
+fn looks_placeholder(s: &str) -> bool {
+    let lower = s.to_ascii_lowercase();
+    s == DEV_JWT_SECRET_SENTINEL
+        || lower.contains("change_me")
+        || lower.contains("dev_secret")
+        || lower.contains("placeholder")
+}
+
+/// Enforce secret hygiene. In production every guard is hard-fail: a booting app
+/// with a publicly-known signing key is worse than one that refuses to start.
+/// Outside production the dev sentinel is tolerated (warned) so local dev is frictionless.
+fn validate_secrets(is_prod: bool, jwt_secret: &str, admin_password_hash: &str) -> Result<()> {
+    if is_prod {
+        if looks_placeholder(jwt_secret) {
+            return Err(anyhow!(
+                "Refusing to start in production with a placeholder JWT_SECRET — \
+                 rotate it (openssl rand -hex 64)."
+            ));
+        }
+        if jwt_secret.len() < 32 {
+            return Err(anyhow!("JWT_SECRET must be at least 32 characters."));
+        }
+        if admin_password_hash.is_empty() || looks_placeholder(admin_password_hash) {
+            return Err(anyhow!(
+                "Refusing to start in production without a real ADMIN_PASSWORD_HASH — \
+                 generate one (htpasswd -bnBC 12 '' <password> | tr -d ':\\n')."
+            ));
+        }
+    } else if jwt_secret == DEV_JWT_SECRET_SENTINEL {
+        tracing::warn!(
+            "JWT_SECRET is the dev sentinel — fine for local development, NEVER ship this."
+        );
+    } else if jwt_secret.len() < 32 {
+        return Err(anyhow!("JWT_SECRET must be at least 32 characters."));
+    }
+    Ok(())
+}
+
 #[derive(Clone, Debug)]
 pub struct AppConfig {
     pub database_url: String,
@@ -15,7 +56,13 @@ pub struct AppConfig {
     pub event_name: String,
     pub event_slug: String,
     pub media_path: PathBuf,
+    /// Where export archives are written. MUST be outside `media_path` — that
+    /// directory is served by a public `ServeDir`, so a predictable archive name
+    /// under it would leak the whole gallery to anonymous visitors.
+    pub export_path: PathBuf,
     pub app_port: u16,
+    /// Number of concurrent media compression workers (read once at boot).
+    pub compression_concurrency: usize,
 }
 
 impl AppConfig {
@@ -25,19 +72,9 @@ impl AppConfig {
         let is_prod = app_env.eq_ignore_ascii_case("production");
 
         let jwt_secret = std::env::var("JWT_SECRET").context("JWT_SECRET must be set")?;
-        if jwt_secret == DEV_JWT_SECRET_SENTINEL {
-            if is_prod {
-                return Err(anyhow!(
-                    "Refusing to start in production with the well-known dev JWT_SECRET — \
-                     rotate it (openssl rand -hex 64)."
-                ));
-            }
-            tracing::warn!(
-                "JWT_SECRET is the dev sentinel — fine for local development, NEVER ship this."
-            );
-        } else if jwt_secret.len() < 32 {
-            return Err(anyhow!("JWT_SECRET must be at least 32 characters."));
-        }
+        let admin_password_hash = std::env::var("ADMIN_PASSWORD_HASH").unwrap_or_default();
+
+        validate_secrets(is_prod, &jwt_secret, &admin_password_hash)?;
 
         Ok(Self {
             database_url: std::env::var("DATABASE_URL")
@@ -47,8 +84,7 @@ impl AppConfig {
                 .unwrap_or_else(|_| "30".to_string())
                 .parse()
                 .context("SESSION_EXPIRY_DAYS must be a number")?,
-            admin_password_hash: std::env::var("ADMIN_PASSWORD_HASH")
-                .unwrap_or_default(),
+            admin_password_hash,
             event_name: std::env::var("EVENT_NAME")
                 .unwrap_or_else(|_| "EventSnap".to_string()),
             event_slug: std::env::var("EVENT_SLUG")
@@ -56,10 +92,80 @@ impl AppConfig {
             media_path: PathBuf::from(
                 std::env::var("MEDIA_PATH").unwrap_or_else(|_| "/media".to_string()),
             ),
+            export_path: PathBuf::from(
+                std::env::var("EXPORT_PATH").unwrap_or_else(|_| "/exports".to_string()),
+            ),
             app_port: std::env::var("APP_PORT")
                 .unwrap_or_else(|_| "3000".to_string())
                 .parse()
                 .context("APP_PORT must be a number")?,
+            compression_concurrency: std::env::var("COMPRESSION_WORKER_CONCURRENCY")
+                .ok()
+                .and_then(|v| v.parse().ok())
+                .filter(|&n| n >= 1)
+                .unwrap_or(2),
         })
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const REAL_SECRET: &str = "a1b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2";
+    const REAL_HASH: &str = "$2y$12$abcdefghijklmnopqrstuv.wxyzABCDEFGHIJKLMNOPQRSTUVWXYZ012";
+
+    #[test]
+    fn prod_rejects_shipped_placeholder_secret() {
+        // The exact string shipped in `.env` — >32 chars, so it must be caught by
+        // the substring guard, not the length check.
+        let err = validate_secrets(true, "change_me_to_a_random_64_byte_hex_string", REAL_HASH);
+        assert!(err.is_err(), "placeholder JWT_SECRET must be rejected in prod");
+    }
+
+    #[test]
+    fn prod_rejects_dev_sentinel_and_short_secret() {
+        assert!(validate_secrets(true, DEV_JWT_SECRET_SENTINEL, REAL_HASH).is_err());
+        assert!(validate_secrets(true, "tooshort", REAL_HASH).is_err());
+    }
+
+    #[test]
+    fn prod_rejects_missing_or_placeholder_admin_hash() {
+        assert!(validate_secrets(true, REAL_SECRET, "").is_err());
+        assert!(validate_secrets(true, REAL_SECRET, "$2y$12$placeholder_replace_me").is_err());
+    }
+
+    #[test]
+    fn prod_accepts_real_secrets() {
+        assert!(validate_secrets(true, REAL_SECRET, REAL_HASH).is_ok());
+    }
+
+    #[test]
+    fn non_prod_tolerates_dev_sentinel() {
+        assert!(validate_secrets(false, DEV_JWT_SECRET_SENTINEL, "").is_ok());
+    }
+
+    #[test]
+    fn non_prod_still_rejects_short_non_sentinel_secret() {
+        assert!(validate_secrets(false, "tooshort", "").is_err());
+    }
+
+    #[test]
+    fn placeholder_detection_is_case_insensitive() {
+        // looks_placeholder lowercases before matching — an upper/mixed-case
+        // placeholder must still be rejected in prod.
+        assert!(validate_secrets(true, "CHANGE_ME_TO_A_RANDOM_64_BYTE_HEX_STRING", REAL_HASH).is_err());
+        assert!(validate_secrets(true, REAL_SECRET, "$2Y$12$PLACEHOLDER_replace_me").is_err());
+    }
+
+    #[test]
+    fn prod_len_boundary_at_32() {
+        // Exactly 32 non-placeholder chars is the minimum accepted; 31 is rejected.
+        const LEN_32: &str = "abcdefghijklmnopqrstuvwxyz012345";
+        const LEN_31: &str = "abcdefghijklmnopqrstuvwxyz01234";
+        assert_eq!(LEN_32.len(), 32);
+        assert_eq!(LEN_31.len(), 31);
+        assert!(validate_secrets(true, LEN_32, REAL_HASH).is_ok());
+        assert!(validate_secrets(true, LEN_31, REAL_HASH).is_err());
+    }
+}

backend/src/error.rs

@@ -10,6 +10,10 @@ pub enum AppError {
     Conflict(String),
     /// Second field: optional retry-after seconds to include in the response.
     TooManyRequests(String, Option<u64>),
+    /// Per-user storage quota exhausted. Distinct from `TooManyRequests` (rate limit) so
+    /// the client can treat it as *terminal* (413, no retry) instead of backing off and
+    /// retrying a permanently-failing upload forever.
+    QuotaExceeded(String),
     Internal(anyhow::Error),
 }
 
@@ -22,6 +26,7 @@ impl AppError {
             Self::NotFound(_) => (StatusCode::NOT_FOUND, "not_found"),
             Self::Conflict(_) => (StatusCode::CONFLICT, "conflict"),
             Self::TooManyRequests(..) => (StatusCode::TOO_MANY_REQUESTS, "too_many_requests"),
+            Self::QuotaExceeded(_) => (StatusCode::PAYLOAD_TOO_LARGE, "quota_exceeded"),
             Self::Internal(_) => (StatusCode::INTERNAL_SERVER_ERROR, "internal_error"),
         }
     }
@@ -34,6 +39,7 @@ impl AppError {
             | Self::NotFound(msg)
             | Self::Conflict(msg) => msg.clone(),
             Self::TooManyRequests(msg, _) => msg.clone(),
+            Self::QuotaExceeded(msg) => msg.clone(),
             Self::Internal(err) => {
                 tracing::error!("internal error: {err:#}");
                 "Ein interner Fehler ist aufgetreten.".to_string()

backend/src/handlers/admin.rs

@@ -1,11 +1,10 @@
 use std::collections::HashMap;
 use std::time::Duration;
 
-use axum::extract::State;
+use axum::extract::{Query, State};
 use axum::http::{HeaderMap, StatusCode};
 use axum::Json;
 use serde::{Deserialize, Serialize};
-use sysinfo::System;
 
 use crate::auth::middleware::RequireAdmin;
 use crate::error::AppError;
@@ -68,23 +67,12 @@ pub async fn get_stats(
     .fetch_one(&state.pool)
     .await?;
 
-    // Disk usage via sysinfo
-    let mut sys = System::new();
-    sys.refresh_all();
-
-    let media_path = state.config.media_path.to_string_lossy().to_string();
-    let (disk_total, disk_free) = sysinfo::Disks::new_with_refreshed_list()
-        .iter()
-        .find(|d| media_path.starts_with(d.mount_point().to_string_lossy().as_ref()))
-        .map(|d| (d.total_space(), d.available_space()))
-        .unwrap_or_else(|| {
-            // Fall back to the root disk
-            sysinfo::Disks::new_with_refreshed_list()
-                .iter()
-                .find(|d| d.mount_point().to_string_lossy() == "/")
-                .map(|d| (d.total_space(), d.available_space()))
-                .unwrap_or((0, 0))
-        });
+    // Disk usage from the shared cache (unknown mount → zeros, same as before).
+    let (disk_total, disk_free) = state
+        .disk_cache
+        .snapshot(&state.config.media_path)
+        .map(|d| (d.total, d.free))
+        .unwrap_or((0, 0));
 
     let disk_used = disk_total.saturating_sub(disk_free);
 
@@ -121,15 +109,18 @@ pub async fn patch_config(
     // Numeric keys validated as f64; boolean keys validated as truthy strings; the
     // privacy note is free text. Splitting these explicitly is verbose but makes the
     // failure mode for typos obvious (`Unbekannter Schlüssel: ...`).
-    const NUMERIC_KEYS: &[&str] = &[
-        "max_image_size_mb",
-        "max_video_size_mb",
-        "upload_rate_per_hour",
-        "feed_rate_per_min",
-        "export_rate_per_day",
-        "quota_tolerance",
-        "estimated_guest_count",
-        "compression_concurrency",
+    // (key, integer_only, min, max). Ranges reject values that `parse::<f64>` would
+    // accept but that silently revert to the hardcoded default at read time
+    // (get_usize/get_i64 can't parse negatives/NaN/fractionals). `compression_concurrency`
+    // is intentionally absent — it's read once at boot, so a live edit was a no-op.
+    const NUMERIC_SPECS: &[(&str, bool, f64, f64)] = &[
+        ("max_image_size_mb", true, 1.0, 1024.0),
+        ("max_video_size_mb", true, 1.0, 10240.0),
+        ("upload_rate_per_hour", true, 1.0, 100_000.0),
+        ("feed_rate_per_min", true, 1.0, 100_000.0),
+        ("export_rate_per_day", true, 1.0, 100_000.0),
+        ("quota_tolerance", false, 0.0, 1.0),
+        ("estimated_guest_count", true, 1.0, 1_000_000.0),
     ];
     const BOOL_KEYS: &[&str] = &[
         "rate_limits_enabled",
@@ -146,12 +137,30 @@ pub async fn patch_config(
 
     let mut privacy_note_changed = false;
 
+    // Validate every key first so a bad value in the batch can't leave a partial
+    // update behind — validation must fully precede any write.
     for (key, value) in &body {
         let key_str = key.as_str();
-        if NUMERIC_KEYS.contains(&key_str) {
-            if value.parse::<f64>().is_err() {
+        if let Some(&(_, integer_only, min, max)) =
+            NUMERIC_SPECS.iter().find(|(k, ..)| *k == key_str)
+        {
+            let n = value.trim().parse::<f64>().ok().filter(|n| n.is_finite());
+            let n = match n {
+                Some(n) => n,
+                None => {
+                    return Err(AppError::BadRequest(format!(
+                        "Ungültiger Wert für {key}: muss eine Zahl sein."
+                    )))
+                }
+            };
+            if integer_only && n.fract() != 0.0 {
                 return Err(AppError::BadRequest(format!(
-                    "Ungültiger Wert für {key}: muss eine Zahl sein."
+                    "Ungültiger Wert für {key}: muss eine ganze Zahl sein."
+                )));
+            }
+            if n < min || n > max {
+                return Err(AppError::BadRequest(format!(
+                    "Wert für {key} liegt außerhalb des zulässigen Bereichs ({min}–{max})."
                 )));
             }
         } else if BOOL_KEYS.contains(&key_str) {
@@ -164,7 +173,9 @@ pub async fn patch_config(
                 }
             }
         } else if TEXT_KEYS.contains(&key_str) {
-            if value.len() > PRIVACY_NOTE_MAX_LEN {
+            // Count characters, not bytes — the message says "Zeichen" and a
+            // multi-byte grapheme shouldn't count against the limit multiple times.
+            if value.chars().count() > PRIVACY_NOTE_MAX_LEN {
                 return Err(AppError::BadRequest(format!(
                     "Wert für {key} ist zu lang (max. {PRIVACY_NOTE_MAX_LEN} Zeichen)."
                 )));
@@ -177,16 +188,26 @@ pub async fn patch_config(
                 "Unbekannter Konfigurationsschlüssel: {key}"
             )));
         }
+    }
 
+    // Apply all writes in one transaction — the batch is all-or-nothing.
+    let mut tx = state.pool.begin().await?;
+    for (key, value) in &body {
         sqlx::query(
             "INSERT INTO config (key, value, updated_at) VALUES ($1, $2, NOW())
              ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()",
         )
         .bind(key)
         .bind(value)
-        .execute(&state.pool)
+        .execute(&mut *tx)
         .await?;
     }
+    tx.commit().await?;
+
+    // The config cache must reflect this write on the very next read (tests PATCH then
+    // immediately assert the new value takes effect). Invalidate synchronously here —
+    // the TTL is only a backstop and must not be relied on for correctness.
+    state.config_cache.invalidate();
 
     // Notify all clients that a publicly-readable config value changed so their stores
     // (e.g. the privacy note in My Account) refresh without a manual reload.
@@ -223,11 +244,48 @@ pub async fn get_export_jobs(
 
 // ── Export download endpoints (authenticated guests) ─────────────────────────
 
+#[derive(Deserialize)]
+pub struct DownloadQuery {
+    pub ticket: String,
+}
+
+/// Mint a short-lived ticket for a browser-driven export download. The download
+/// is a top-level navigation so the multi-GB ZIP streams straight to disk instead
+/// of being buffered in memory by `fetch()` + `blob()` — but a navigation can't
+/// carry an `Authorization` header, so the client exchanges its Bearer token for
+/// an opaque ticket here, then hits `/export/zip?ticket=...`. Reuses the same
+/// single-use, 30s-TTL store as the SSE stream.
+pub async fn export_ticket(
+    State(state): State<AppState>,
+    auth: crate::auth::middleware::AuthUser,
+) -> Json<serde_json::Value> {
+    // NOTE: intentionally NOT gated on `is_banned`. A banned user keeps *read* access
+    // by design (USER_JOURNEYS §10.3, FEATURES: "Can still download the export once
+    // released — Spec design choice"). The export is read-only, so it stays available
+    // to them, consistent with the read-only-ban model.
+    let ticket = state.sse_tickets.issue(auth.token_hash);
+    Json(serde_json::json!({ "ticket": ticket }))
+}
+
+/// Validate a download ticket (single-use) and confirm its session still exists.
+async fn authenticate_download_ticket(state: &AppState, ticket: &str) -> Result<(), AppError> {
+    let token_hash = state
+        .sse_tickets
+        .consume(ticket)
+        .ok_or_else(|| AppError::Unauthorized("Ticket ungültig oder abgelaufen.".into()))?;
+    crate::models::session::Session::find_by_token_hash(&state.pool, &token_hash)
+        .await
+        .map_err(|e| AppError::Internal(e.into()))?
+        .ok_or_else(|| AppError::Unauthorized("Sitzung nicht gefunden.".into()))?;
+    Ok(())
+}
+
 pub async fn download_zip(
     State(state): State<AppState>,
-    _auth: crate::auth::middleware::AuthUser,
+    Query(q): Query<DownloadQuery>,
     headers: HeaderMap,
 ) -> Result<axum::response::Response, AppError> {
+    authenticate_download_ticket(&state, &q.ticket).await?;
     enforce_export_rate(&state, &headers).await?;
 
     let event = crate::models::event::Event::find_by_slug(&state.pool, &state.config.event_slug)
@@ -240,7 +298,7 @@ pub async fn download_zip(
         ));
     }
 
-    let path = state.config.media_path.join("exports").join("Gallery.zip");
+    let path = state.config.export_path.join("Gallery.zip");
     if !path.exists() {
         return Err(AppError::NotFound("Exportdatei nicht gefunden.".into()));
     }
@@ -250,9 +308,10 @@ pub async fn download_zip(
 
 pub async fn download_html(
     State(state): State<AppState>,
-    _auth: crate::auth::middleware::AuthUser,
+    Query(q): Query<DownloadQuery>,
     headers: HeaderMap,
 ) -> Result<axum::response::Response, AppError> {
+    authenticate_download_ticket(&state, &q.ticket).await?;
     enforce_export_rate(&state, &headers).await?;
 
     let event = crate::models::event::Event::find_by_slug(&state.pool, &state.config.event_slug)
@@ -265,7 +324,7 @@ pub async fn download_html(
         ));
     }
 
-    let path = state.config.media_path.join("exports").join("Memories.zip");
+    let path = state.config.export_path.join("Memories.zip");
     if !path.exists() {
         return Err(AppError::NotFound("Exportdatei nicht gefunden.".into()));
     }
@@ -342,13 +401,13 @@ pub async fn export_status(
 /// switch + per-endpoint switch + numeric value, all stored in `config` and read on
 /// each request.
 async fn enforce_export_rate(state: &AppState, headers: &HeaderMap) -> Result<(), AppError> {
-    let rate_limits_on = config::get_bool(&state.pool, "rate_limits_enabled", true).await;
-    let export_rate_on = config::get_bool(&state.pool, "export_rate_enabled", true).await;
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let export_rate_on = config::get_bool(&state.config_cache, "export_rate_enabled", true).await;
     if !(rate_limits_on && export_rate_on) {
         return Ok(());
     }
     let ip = client_ip(headers, "unknown");
-    let limit = config::get_usize(&state.pool, "export_rate_per_day", 3).await;
+    let limit = config::get_usize(&state.config_cache, "export_rate_per_day", 3).await;
     if !state
         .rate_limiter
         .check(format!("export:{ip}"), limit, Duration::from_secs(86400))

backend/src/handlers/feed.rs

@@ -62,10 +62,10 @@ pub async fn feed(
     Query(q): Query<FeedQuery>,
 ) -> Result<Json<FeedResponse>, AppError> {
     let ip = client_ip(&headers, "unknown");
-    let rate_limits_on = config::get_bool(&state.pool, "rate_limits_enabled", true).await;
-    let feed_rate_on = config::get_bool(&state.pool, "feed_rate_enabled", true).await;
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let feed_rate_on = config::get_bool(&state.config_cache, "feed_rate_enabled", true).await;
     if rate_limits_on && feed_rate_on {
-        let rate_limit = config::get_usize(&state.pool, "feed_rate_per_min", 60).await;
+        let rate_limit = config::get_usize(&state.config_cache, "feed_rate_per_min", 60).await;
         if !state
             .rate_limiter
             .check(format!("feed:{ip}"), rate_limit, Duration::from_secs(60))
@@ -79,6 +79,17 @@ pub async fn feed(
 
     let limit = q.limit.unwrap_or(20).min(100);
 
+    // Resolve the cursor to a (created_at, id) position. The pair is compared as a
+    // tuple so ties on created_at break on id — keyset pagination on created_at
+    // alone would silently drop rows sharing a timestamp across a page boundary.
+    let (cursor_time, cursor_id) = match q.cursor {
+        Some(c) => match get_cursor_pos(&state.pool, c).await {
+            Some((t, id)) => (Some(t), Some(id)),
+            None => (None, None),
+        },
+        None => (None, None),
+    };
+
     let rows = if let Some(hashtag) = &q.hashtag {
         let tag = hashtag.trim().trim_start_matches('#').to_lowercase();
         sqlx::query_as::<_, FeedRow>(
@@ -88,19 +99,14 @@ pub async fn feed(
              JOIN upload_hashtag uh ON uh.upload_id = v.id
              JOIN hashtag h ON h.id = uh.hashtag_id AND h.tag = $1
              WHERE v.event_id = $2
-               AND ($3::timestamptz IS NULL OR v.created_at < $3)
-             ORDER BY v.created_at DESC
-             LIMIT $4",
+               AND ($3::timestamptz IS NULL OR (v.created_at, v.id) < ($3, $4))
+             ORDER BY v.created_at DESC, v.id DESC
+             LIMIT $5",
         )
         .bind(&tag)
         .bind(auth.event_id)
-        .bind(
-            if let Some(cursor) = q.cursor {
-                get_cursor_time(&state.pool, cursor).await
-            } else {
-                None
-            },
-        )
+        .bind(cursor_time)
+        .bind(cursor_id)
         .bind(limit + 1)
         .fetch_all(&state.pool)
         .await?
@@ -110,18 +116,13 @@ pub async fn feed(
                     mime_type, caption, like_count, comment_count, created_at
              FROM v_feed
              WHERE event_id = $1
-               AND ($2::timestamptz IS NULL OR created_at < $2)
-             ORDER BY created_at DESC
-             LIMIT $3",
+               AND ($2::timestamptz IS NULL OR (created_at, id) < ($2, $3))
+             ORDER BY created_at DESC, id DESC
+             LIMIT $4",
         )
         .bind(auth.event_id)
-        .bind(
-            if let Some(cursor) = q.cursor {
-                get_cursor_time(&state.pool, cursor).await
-            } else {
-                None
-            },
-        )
+        .bind(cursor_time)
+        .bind(cursor_id)
         .bind(limit + 1)
         .fetch_all(&state.pool)
         .await?
@@ -138,8 +139,17 @@ pub async fn feed(
     let uploads = rows
         .into_iter()
         .map(|r| {
-            let preview_url = r.preview_path.map(|p| format!("/media/{p}"));
-            let thumbnail_url = r.thumbnail_path.map(|p| format!("/media/{p}"));
+            // Gated media aliases (visibility-checked, direct /media blocked). Emit the
+            // URL only when the variant actually exists — the URL is what signals the
+            // client which variant to load.
+            let preview_url = r
+                .preview_path
+                .as_ref()
+                .map(|_| format!("/api/v1/upload/{}/preview", r.id));
+            let thumbnail_url = r
+                .thumbnail_path
+                .as_ref()
+                .map(|_| format!("/api/v1/upload/{}/thumbnail", r.id));
             FeedUpload {
                 liked_by_me: liked_set.contains(&r.id),
                 id: r.id,
@@ -171,6 +181,16 @@ pub struct DeltaQuery {
 pub struct DeltaResponse {
     pub uploads: Vec<FeedUpload>,
     pub deleted_ids: Vec<Uuid>,
+    /// True when the upload query hit `DELTA_LIMIT`: the response carries only the
+    /// newest slice of the gap, so the client must fall back to a full feed refresh
+    /// rather than merging (the older missed uploads are absent and unrecoverable
+    /// via a later delta, which advances `since` past them).
+    pub truncated: bool,
+    /// The server's clock at the moment this delta was computed. The client advances its
+    /// reconnect cursor from THIS, never `new Date()` — a browser clock even seconds fast
+    /// would otherwise silently skip uploads whose server `created_at` falls in the skew
+    /// window (they'd never reappear without a hard refresh).
+    pub server_time: DateTime<Utc>,
 }
 
 pub async fn feed_delta(
@@ -178,18 +198,55 @@ pub async fn feed_delta(
     auth: AuthUser,
     Query(q): Query<DeltaQuery>,
 ) -> Result<Json<DeltaResponse>, AppError> {
+    // Rate-limit the delta the same way as the paginated feed. Without this, ~100 clients
+    // reconnecting at once (post-outage, or a flapping network) each fire an unbounded
+    // delta fetch — a reconnect stampede. Keyed per-user so one client can't starve others
+    // behind a shared NAT.
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let feed_rate_on = config::get_bool(&state.config_cache, "feed_rate_enabled", true).await;
+    if rate_limits_on && feed_rate_on {
+        let rate_limit = config::get_usize(&state.config_cache, "feed_rate_per_min", 60).await;
+        if !state.rate_limiter.check(
+            format!("feed_delta:{}", auth.user_id),
+            rate_limit,
+            Duration::from_secs(60),
+        ) {
+            return Err(AppError::TooManyRequests(
+                "Zu viele Anfragen. Bitte warte kurz und versuche es erneut.".into(),
+                None,
+            ));
+        }
+    }
+
+    // Anchor the next cursor to the DB clock, captured *before* the queries so an upload
+    // committed during this handler is re-fetched next time rather than skipped (a
+    // duplicate id merges idempotently on the client; a miss is unrecoverable).
+    let server_time: DateTime<Utc> = sqlx::query_scalar("SELECT NOW()")
+        .fetch_one(&state.pool)
+        .await?;
+
+    // Bounded like the paginated feed: a stale `since` could otherwise pull the
+    // entire event's uploads in one response. If a client hits the cap it should
+    // fall back to a full feed refresh rather than another delta.
+    const DELTA_LIMIT: i64 = 200;
     let rows = sqlx::query_as::<_, FeedRow>(
         "SELECT id, user_id, uploader_name, preview_path, thumbnail_path,
                 mime_type, caption, like_count, comment_count, created_at
          FROM v_feed
          WHERE event_id = $1 AND created_at > $2
-         ORDER BY created_at DESC",
+         ORDER BY created_at DESC, id DESC
+         LIMIT $3",
     )
     .bind(auth.event_id)
     .bind(q.since)
+    .bind(DELTA_LIMIT)
     .fetch_all(&state.pool)
     .await?;
 
+    // Hit the cap => this is only the newest slice of a larger gap. Signal the
+    // client to full-refresh instead of merging a partial delta.
+    let truncated = rows.len() as i64 >= DELTA_LIMIT;
+
     let deleted_ids: Vec<(Uuid,)> = sqlx::query_as(
         "SELECT id FROM upload
          WHERE event_id = $1 AND deleted_at IS NOT NULL AND deleted_at > $2",
@@ -209,8 +266,14 @@ pub async fn feed_delta(
             id: r.id,
             user_id: r.user_id,
             uploader_name: r.uploader_name,
-            preview_url: r.preview_path.map(|p| format!("/media/{p}")),
-            thumbnail_url: r.thumbnail_path.map(|p| format!("/media/{p}")),
+            preview_url: r
+                .preview_path
+                .as_ref()
+                .map(|_| format!("/api/v1/upload/{}/preview", r.id)),
+            thumbnail_url: r
+                .thumbnail_path
+                .as_ref()
+                .map(|_| format!("/api/v1/upload/{}/thumbnail", r.id)),
             mime_type: r.mime_type,
             caption: r.caption,
             like_count: r.like_count,
@@ -222,6 +285,8 @@ pub async fn feed_delta(
     Ok(Json(DeltaResponse {
         uploads,
         deleted_ids: deleted_ids.into_iter().map(|r| r.0).collect(),
+        truncated,
+        server_time,
     }))
 }
 
@@ -249,14 +314,17 @@ pub async fn hashtags(
     ))
 }
 
-async fn get_cursor_time(pool: &sqlx::PgPool, cursor_id: Uuid) -> Option<DateTime<Utc>> {
-    let row: Option<(DateTime<Utc>,)> =
-        sqlx::query_as("SELECT created_at FROM upload WHERE id = $1")
+/// Resolve a cursor id to its `(created_at, id)` position. Both are needed:
+/// `created_at` alone isn't unique, so pagination must break ties on `id` to
+/// avoid silently dropping rows that share a timestamp across a page boundary.
+async fn get_cursor_pos(pool: &sqlx::PgPool, cursor_id: Uuid) -> Option<(DateTime<Utc>, Uuid)> {
+    let row: Option<(DateTime<Utc>, Uuid)> =
+        sqlx::query_as("SELECT created_at, id FROM upload WHERE id = $1")
             .bind(cursor_id)
             .fetch_optional(pool)
             .await
             .ok()?;
-    row.map(|r| r.0)
+    row
 }
 
 async fn get_liked_set(

backend/src/handlers/host.rs

@@ -9,6 +9,7 @@ use crate::auth::middleware::RequireHost;
 use crate::error::AppError;
 use crate::models::comment::Comment;
 use crate::models::event::Event;
+use crate::models::session::Session;
 use crate::models::upload::Upload;
 use crate::models::user::UserRole;
 use crate::state::{AppState, SseEvent};
@@ -35,11 +36,27 @@ pub struct EventStatus {
     pub export_released: bool,
 }
 
-#[derive(Deserialize)]
-pub struct BanRequest {
-    pub hide_uploads: bool,
+/// Count non-banned hosts/admins in the event OTHER than `excluding` — the operators
+/// who would remain if `excluding` were demoted or banned. Used to enforce the "an event
+/// always keeps at least one operator" floor.
+async fn remaining_operators(
+    state: &AppState,
+    event_id: Uuid,
+    excluding: Uuid,
+) -> Result<i64, AppError> {
+    let count = sqlx::query_scalar::<_, i64>(
+        "SELECT COUNT(*) FROM \"user\"
+         WHERE event_id = $1 AND id != $2
+           AND role IN ('host', 'admin') AND is_banned = FALSE",
+    )
+    .bind(event_id)
+    .bind(excluding)
+    .fetch_one(&state.pool)
+    .await?;
+    Ok(count)
 }
 
+
 #[derive(Deserialize)]
 pub struct SetRoleRequest {
     pub role: String,
@@ -93,8 +110,8 @@ pub async fn ban_user(
     State(state): State<AppState>,
     RequireHost(auth): RequireHost,
     Path(user_id): Path<Uuid>,
-    Json(body): Json<BanRequest>,
 ) -> Result<StatusCode, AppError> {
+    // The ban request carries no body — ban always hides (no per-request options).
     // Cannot ban yourself or another host/admin
     if user_id == auth.user_id {
         return Err(AppError::BadRequest("Du kannst dich nicht selbst sperren.".into()));
@@ -112,19 +129,46 @@ pub async fn ban_user(
         return Err(AppError::Forbidden("Du kannst diesen Benutzer nicht sperren.".into()));
     }
 
+    // Floor: never leave the event with zero operators. Banning removes the target from
+    // the active-operator pool, so refuse if they're the last non-banned host/admin.
+    if target.0 == "host" && remaining_operators(&state, auth.event_id, user_id).await? == 0 {
+        return Err(AppError::BadRequest(
+            "Der letzte Host kann nicht gesperrt werden.".into(),
+        ));
+    }
+
+    // Ban ALWAYS hides: a banned user's content is "gone" everywhere. The visibility
+    // views/queries now also filter on `is_banned` (defense in depth), and we set
+    // `uploads_hidden` so the existing `user-hidden` live-eviction path fires too. The old
+    // opt-out checkbox is gone — `hide_uploads` in the request is ignored.
+    //
+    // We deliberately do NOT revoke the banned user's sessions. This is a *read-only ban*
+    // by design (USER_JOURNEYS §10.3): the user keeps read access to the feed and can still
+    // download the released export — writes and host/admin actions are what the ban blocks
+    // (enforced live on the write handlers + Require{Host,Admin}). Revoking sessions would
+    // contradict that model, break the documented "banned guest can still download the
+    // keepsake" flow, and be ineffective anyway (the user could just /recover a new session).
     sqlx::query(
-        "UPDATE \"user\" SET is_banned = TRUE, uploads_hidden = $2 WHERE id = $1",
+        "UPDATE \"user\" SET is_banned = TRUE, uploads_hidden = TRUE WHERE id = $1 AND event_id = $2",
     )
     .bind(user_id)
-    .bind(body.hide_uploads)
+    .bind(auth.event_id)
     .execute(&state.pool)
     .await?;
 
+    // Evict their content live from every feed + the diashow so it disappears without
+    // each viewer having to reload. (Their own SSE stream is separately dropped by the
+    // is_banned revalidation in `sse::stream`, so they stop receiving live pushes while
+    // retaining plain read access.)
+    let _ = state.sse_tx.send(SseEvent::new(
+        "user-hidden",
+        serde_json::json!({ "user_id": user_id }).to_string(),
+    ));
+
     tracing::info!(
         actor_user_id = %auth.user_id,
         target_user_id = %user_id,
         event_id = %auth.event_id,
-        hide_uploads = body.hide_uploads,
         "host: ban_user"
     );
 
@@ -136,8 +180,30 @@ pub async fn unban_user(
     RequireHost(auth): RequireHost,
     Path(user_id): Path<Uuid>,
 ) -> Result<StatusCode, AppError> {
+    // Mirror the ban guard: a host may only lift bans on guests, never on hosts or
+    // admins. Without this a host could override an admin's ban of another host,
+    // which is asymmetric with `ban_user` and lets a host escalate a peer back in.
+    let target = sqlx::query_as::<_, (String,)>(
+        "SELECT role::text FROM \"user\" WHERE id = $1 AND event_id = $2",
+    )
+    .bind(user_id)
+    .bind(auth.event_id)
+    .fetch_optional(&state.pool)
+    .await?
+    .ok_or_else(|| AppError::NotFound("Benutzer nicht gefunden.".into()))?;
+
+    if target.0 == "admin"
+        || (target.0 == "host" && auth.role != crate::models::user::UserRole::Admin)
+    {
+        return Err(AppError::Forbidden(
+            "Du kannst diesen Benutzer nicht entsperren.".into(),
+        ));
+    }
+
+    // Unban restores visibility too: ban set `uploads_hidden = TRUE`, so clearing only
+    // `is_banned` would leave their content invisible. Clear both.
     let result = sqlx::query(
-        "UPDATE \"user\" SET is_banned = FALSE WHERE id = $1 AND event_id = $2",
+        "UPDATE \"user\" SET is_banned = FALSE, uploads_hidden = FALSE WHERE id = $1 AND event_id = $2",
     )
     .bind(user_id)
     .bind(auth.event_id)
@@ -189,9 +255,25 @@ pub async fn set_role(
     .await?
     .ok_or_else(|| AppError::NotFound("Benutzer nicht gefunden.".into()))?;
 
-    if target.0 == "admin" {
+    // Admins are untouchable by hosts. A plain host also may not demote another
+    // *host*: without this guard a host could demote a peer host to guest and then
+    // ban / PIN-reset (→ account-takeover via /recover) them — the ban/pin-reset peer
+    // guards key off the target's *current* role, so a prior demotion would launder
+    // past them. Only an admin may change a host's role.
+    if target.0 == "admin" || (target.0 == "host" && auth.role != UserRole::Admin) {
         return Err(AppError::Forbidden(
-            "Admins können nicht geändert werden.".into(),
+            "Du darfst die Rolle dieses Benutzers nicht ändern.".into(),
+        ));
+    }
+
+    // Floor: demoting the last non-banned host/admin to guest would leave the event with
+    // no operator. Refuse.
+    if new_role == "guest"
+        && target.0 == "host"
+        && remaining_operators(&state, auth.event_id, user_id).await? == 0
+    {
+        return Err(AppError::BadRequest(
+            "Der letzte Host kann nicht zum Gast gemacht werden.".into(),
         ));
     }
 
@@ -263,15 +345,26 @@ pub async fn reset_user_pin(
     sqlx::query(
         "UPDATE \"user\"
          SET recovery_pin_hash = $1,
-             pin_failed_attempts = 0,
+             failed_pin_attempts = 0,
              pin_locked_until = NULL
-         WHERE id = $2",
+         WHERE id = $2 AND event_id = $3",
     )
     .bind(&pin_hash)
     .bind(user_id)
+    .bind(auth.event_id)
     .execute(&state.pool)
     .await?;
 
+    // A PIN reset means the old credential is compromised/forgotten — revoke every
+    // existing session so old devices must re-authenticate with the new PIN.
+    let _ = Session::delete_all_for_user(&state.pool, user_id).await;
+
+    // Resolve any pending in-app "I forgot my PIN" request for this user.
+    let _ = sqlx::query("DELETE FROM pin_reset_request WHERE user_id = $1")
+        .bind(user_id)
+        .execute(&state.pool)
+        .await;
+
     // Notify the *recipient* device(s) if they happen to be online so they can clear
     // their cached local PIN. They'll save the new one on the next /recover.
     let _ = state.sse_tx.send(SseEvent::new(
@@ -289,6 +382,48 @@ pub async fn reset_user_pin(
     Ok(Json(PinResetResponse { pin }))
 }
 
+#[derive(Serialize, sqlx::FromRow)]
+pub struct PinResetRequestSummary {
+    pub id: Uuid,
+    pub user_id: Uuid,
+    pub display_name: String,
+    pub created_at: DateTime<Utc>,
+}
+
+/// List pending in-app PIN-reset requests so a host can action them (via the existing
+/// `reset_user_pin`, which also clears the request).
+pub async fn list_pin_reset_requests(
+    State(state): State<AppState>,
+    RequireHost(auth): RequireHost,
+) -> Result<Json<Vec<PinResetRequestSummary>>, AppError> {
+    let rows = sqlx::query_as::<_, PinResetRequestSummary>(
+        "SELECT r.id, r.user_id, u.display_name, r.created_at
+         FROM pin_reset_request r
+         JOIN \"user\" u ON u.id = r.user_id
+         WHERE r.event_id = $1
+         ORDER BY r.created_at ASC",
+    )
+    .bind(auth.event_id)
+    .fetch_all(&state.pool)
+    .await?;
+    Ok(Json(rows))
+}
+
+/// Dismiss a PIN-reset request without resetting (e.g. the host couldn't verify the
+/// requester's identity).
+pub async fn dismiss_pin_reset_request(
+    State(state): State<AppState>,
+    RequireHost(auth): RequireHost,
+    Path(id): Path<Uuid>,
+) -> Result<StatusCode, AppError> {
+    sqlx::query("DELETE FROM pin_reset_request WHERE id = $1 AND event_id = $2")
+        .bind(id)
+        .bind(auth.event_id)
+        .execute(&state.pool)
+        .await?;
+    Ok(StatusCode::NO_CONTENT)
+}
+
 pub async fn host_delete_upload(
     State(state): State<AppState>,
     RequireHost(auth): RequireHost,
@@ -328,6 +463,10 @@ pub async fn host_delete_comment(
     if !deleted {
         return Err(AppError::NotFound("Kommentar nicht gefunden.".into()));
     }
+    let _ = state.sse_tx.send(SseEvent::new(
+        "comment-deleted",
+        serde_json::json!({ "comment_id": comment_id }).to_string(),
+    ));
     tracing::info!(
         actor_user_id = %auth.user_id,
         event_id = %auth.event_id,
@@ -341,14 +480,18 @@ pub async fn close_event(
     State(state): State<AppState>,
     RequireHost(_auth): RequireHost,
 ) -> Result<StatusCode, AppError> {
-    sqlx::query(
+    let result = sqlx::query(
         "UPDATE event SET uploads_locked_at = NOW() WHERE slug = $1 AND uploads_locked_at IS NULL",
     )
     .bind(&state.config.event_slug)
     .execute(&state.pool)
     .await?;
 
-    let _ = state.sse_tx.send(SseEvent::new("event-closed", "{}"));
+    // Only broadcast when this call actually flipped the lock — closing an
+    // already-closed event is a no-op and shouldn't spam listeners.
+    if result.rows_affected() > 0 {
+        let _ = state.sse_tx.send(SseEvent::new("event-closed", "{}"));
+    }
 
     Ok(StatusCode::NO_CONTENT)
 }
@@ -357,14 +500,25 @@ pub async fn open_event(
     State(state): State<AppState>,
     RequireHost(_auth): RequireHost,
 ) -> Result<StatusCode, AppError> {
-    sqlx::query(
-        "UPDATE event SET uploads_locked_at = NULL WHERE slug = $1",
+    // Reopening also invalidates any prior release: the keepsake was snapshotted at
+    // release time, so allowing new uploads afterwards would silently diverge the live
+    // feed from the frozen export. Clearing `export_released_at` (and the readiness
+    // flags) lets the host re-release later to regenerate a correct, complete keepsake.
+    let result = sqlx::query(
+        "UPDATE event
+         SET uploads_locked_at = NULL,
+             export_released_at = NULL,
+             export_zip_ready = FALSE,
+             export_html_ready = FALSE
+         WHERE slug = $1 AND (uploads_locked_at IS NOT NULL OR export_released_at IS NOT NULL)",
     )
     .bind(&state.config.event_slug)
     .execute(&state.pool)
     .await?;
 
-    let _ = state.sse_tx.send(SseEvent::new("event-opened", "{}"));
+    if result.rows_affected() > 0 {
+        let _ = state.sse_tx.send(SseEvent::new("event-opened", "{}"));
+    }
 
     Ok(StatusCode::NO_CONTENT)
 }
@@ -373,39 +527,55 @@ pub async fn release_gallery(
     State(state): State<AppState>,
     RequireHost(_auth): RequireHost,
 ) -> Result<StatusCode, AppError> {
+    // Atomic claim: the conditional UPDATE is the sole gate, so two concurrent
+    // release calls can't both pass a check-then-set and double-enqueue exports.
+    // rows_affected == 0 means someone already released.
+    //
+    // Releasing also locks uploads in the same statement (release ⇒ lock). Otherwise a
+    // guest whose offline upload reconnects *after* the export snapshot would land in the
+    // live feed but not in the downloaded keepsake — a silent, non-regenerable data loss.
+    // `COALESCE` preserves an earlier explicit lock time rather than overwriting it.
+    let result = sqlx::query(
+        "UPDATE event
+         SET export_released_at = NOW(),
+             uploads_locked_at = COALESCE(uploads_locked_at, NOW())
+         WHERE slug = $1 AND export_released_at IS NULL",
+    )
+    .bind(&state.config.event_slug)
+    .execute(&state.pool)
+    .await?;
+    if result.rows_affected() == 0 {
+        // Distinguish "no such event" from "already released" for a clean error.
+        let exists = Event::find_by_slug(&state.pool, &state.config.event_slug)
+            .await?
+            .is_some();
+        return Err(if exists {
+            AppError::BadRequest("Galerie wurde bereits freigegeben.".into())
+        } else {
+            AppError::NotFound("Event nicht gefunden.".into())
+        });
+    }
+
+    // Release locked uploads too — tell any open composer to flip to the locked UI live
+    // rather than discovering it via a rejected upload.
+    let _ = state.sse_tx.send(SseEvent::new("event-closed", "{}"));
+
+    // We won the claim — load the event for its id/name to enqueue export jobs.
     let event = Event::find_by_slug(&state.pool, &state.config.event_slug)
         .await?
         .ok_or_else(|| AppError::NotFound("Event nicht gefunden.".into()))?;
 
-    if event.export_released_at.is_some() {
-        return Err(AppError::BadRequest("Galerie wurde bereits freigegeben.".into()));
-    }
-
-    sqlx::query("UPDATE event SET export_released_at = NOW() WHERE slug = $1")
-        .bind(&state.config.event_slug)
-        .execute(&state.pool)
-        .await?;
-
-    // Enqueue export jobs
-    for export_type in ["zip", "html"] {
-        sqlx::query(
-            "INSERT INTO export_job (event_id, type) VALUES ($1, $2::export_type)
-             ON CONFLICT (event_id, type) DO NOTHING",
-        )
-        .bind(event.id)
-        .bind(export_type)
-        .execute(&state.pool)
-        .await?;
-    }
-
-    // Spawn export workers
-    crate::services::export::spawn_export_jobs(
+    // Enqueue + spawn via the shared path so a re-release (after reopen) regenerates
+    // cleanly and startup recovery uses identical logic.
+    crate::services::export::enqueue_and_spawn_exports(
         event.id,
         event.name,
         state.pool.clone(),
         state.config.media_path.clone(),
+        state.config.export_path.clone(),
         state.sse_tx.clone(),
-    );
+    )
+    .await?;
 
     Ok(StatusCode::NO_CONTENT)
 }

backend/src/handlers/me.rs

@@ -55,6 +55,12 @@ pub struct MeContextDto {
     pub privacy_note: String,
     pub quota_enabled: bool,
     pub storage_quota_enabled: bool,
+    /// Uploads are locked (event closed) — the composer should show a locked state live
+    /// instead of letting a guest compose an upload only to eat a 403.
+    pub uploads_locked: bool,
+    /// The gallery has been released and the export snapshotted — uploads are permanently
+    /// closed for this run (release ⇒ lock, and reopening regenerates).
+    pub gallery_released: bool,
 }
 
 pub async fn get_context(
@@ -65,9 +71,14 @@ pub async fn get_context(
         .await?
         .ok_or_else(|| AppError::NotFound("Benutzer nicht gefunden.".into()))?;
 
-    let privacy_note = config::get_str(&state.pool, "privacy_note", "").await;
-    let quota_enabled = config::get_bool(&state.pool, "quota_enabled", true).await;
-    let storage_quota_enabled = config::get_bool(&state.pool, "storage_quota_enabled", true).await;
+    let privacy_note = config::get_str(&state.config_cache, "privacy_note", "").await;
+    let quota_enabled = config::get_bool(&state.config_cache, "quota_enabled", true).await;
+    let storage_quota_enabled = config::get_bool(&state.config_cache, "storage_quota_enabled", true).await;
+
+    let event = crate::models::event::Event::find_by_slug(&state.pool, &state.config.event_slug)
+        .await?;
+    let uploads_locked = event.as_ref().map(|e| e.uploads_locked_at.is_some()).unwrap_or(false);
+    let gallery_released = event.as_ref().map(|e| e.export_released_at.is_some()).unwrap_or(false);
 
     Ok(Json(MeContextDto {
         user_id: user.id,
@@ -76,5 +87,7 @@ pub async fn get_context(
         privacy_note,
         quota_enabled,
         storage_quota_enabled,
+        uploads_locked,
+        gallery_released,
     }))
 }

backend/src/handlers/mod.rs

@@ -2,6 +2,7 @@ pub mod admin;
 pub mod feed;
 pub mod host;
 pub mod me;
+pub mod public;
 pub mod social;
 pub mod sse;
 pub mod test_admin;

backend/src/handlers/public.rs

@@ -0,0 +1,24 @@
+//! Unauthenticated, read-only endpoints safe to expose before a user has joined.
+
+use axum::extract::State;
+use axum::Json;
+use serde::Serialize;
+
+use crate::state::AppState;
+
+#[derive(Serialize)]
+pub struct PublicEventDto {
+    pub name: String,
+    pub slug: String,
+}
+
+/// Public event identity, used by the pre-auth join/recover screens so a guest can
+/// see *which* event they're joining. Only the display name and slug are exposed —
+/// nothing user-scoped — so this is safe without a token. Served straight from the
+/// instance config (no DB round-trip needed).
+pub async fn get_public_event(State(state): State<AppState>) -> Json<PublicEventDto> {
+    Json(PublicEventDto {
+        name: state.config.event_name.clone(),
+        slug: state.config.event_slug.clone(),
+    })
+}

backend/src/handlers/social.rs

@@ -2,20 +2,32 @@ use axum::extract::{Path, Query, State};
 use axum::http::StatusCode;
 use axum::Json;
 use chrono::{DateTime, Utc};
-use serde::Deserialize;
+use serde::{Deserialize, Serialize};
 use uuid::Uuid;
 
 use crate::auth::middleware::AuthUser;
 use crate::error::AppError;
 use crate::models::comment::{Comment, CommentDto};
 use crate::models::hashtag::{self, Hashtag};
+use crate::models::upload::Upload;
 use crate::state::AppState;
 
+#[derive(Serialize)]
+pub struct LikeResponse {
+    /// The caller's like state *after* this toggle. The client sets `liked_by_me` from
+    /// this rather than blind-inverting local state — otherwise a second device (same
+    /// recovered user) drifts, since the `like-update` broadcast only carries `like_count`.
+    pub liked: bool,
+    /// Fresh like count, or `null` if the (best-effort) count query hiccuped. The client
+    /// keeps its current count when this is null rather than adopting a wrong number.
+    pub like_count: Option<i64>,
+}
+
 pub async fn toggle_like(
     State(state): State<AppState>,
     auth: AuthUser,
     Path(upload_id): Path<Uuid>,
-) -> Result<StatusCode, AppError> {
+) -> Result<Json<LikeResponse>, AppError> {
     // Check if user is banned
     let user = crate::models::user::User::find_by_id(&state.pool, auth.user_id)
         .await?
@@ -24,7 +36,17 @@ pub async fn toggle_like(
         return Err(AppError::Forbidden("Du bist gesperrt.".into()));
     }
 
-    // Try to insert; if conflict, delete (toggle)
+    // Event-scope: the upload must belong to the caller's event (404 otherwise),
+    // matching the host handlers' find_by_id_and_event pattern.
+    Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
+        .await?
+        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
+
+    // NOTE: liking is intentionally allowed while the event is locked. Locking
+    // ("Event schließen") freezes *new uploads* only — likes, comments and
+    // browsing stay open (USER_JOURNEYS §9.3, FEATURES capability matrix).
+
+    // Try to insert; if conflict, delete (toggle). `liked` = the caller's state afterwards.
     let result = sqlx::query(
         "INSERT INTO \"like\" (upload_id, user_id) VALUES ($1, $2)
          ON CONFLICT (upload_id, user_id) DO NOTHING",
@@ -34,7 +56,8 @@ pub async fn toggle_like(
     .execute(&state.pool)
     .await?;
 
-    if result.rows_affected() == 0 {
+    let liked = result.rows_affected() > 0;
+    if !liked {
         // Already liked — remove
         sqlx::query("DELETE FROM \"like\" WHERE upload_id = $1 AND user_id = $2")
             .bind(upload_id)
@@ -43,13 +66,30 @@ pub async fn toggle_like(
             .await?;
     }
 
-    // Broadcast SSE
-    let _ = state.sse_tx.send(crate::state::SseEvent {
-        event_type: "like-update".to_string(),
-        data: serde_json::json!({ "upload_id": upload_id }).to_string(),
-    });
+    // Fresh count so feed clients can patch the single card in place instead of
+    // refetching page 1 (mirrors v_feed.like_count = COUNT(DISTINCT user_id)). The like
+    // itself is already committed, so a failed count must not fail the request — but we
+    // also must NOT broadcast/return a bogus 0 (that would push like_count: 0 to every
+    // client until the next event). On error we skip the broadcast and return null.
+    let like_count = sqlx::query_scalar::<_, i64>(
+        "SELECT COUNT(DISTINCT user_id) FROM \"like\" WHERE upload_id = $1",
+    )
+    .bind(upload_id)
+    .fetch_one(&state.pool)
+    .await
+    .ok();
 
-    Ok(StatusCode::NO_CONTENT)
+    if let Some(count) = like_count {
+        // Broadcast the new count so other clients patch their card. Only `like_count` is
+        // shared — each client's own `liked_by_me` only changes via its own toggle (which
+        // now reads it straight from this response).
+        let _ = state.sse_tx.send(crate::state::SseEvent {
+            event_type: "like-update".to_string(),
+            data: serde_json::json!({ "upload_id": upload_id, "like_count": count }).to_string(),
+        });
+    }
+
+    Ok(Json(LikeResponse { liked, like_count }))
 }
 
 #[derive(Deserialize, Default)]
@@ -64,10 +104,15 @@ const COMMENT_PAGE_SIZE: i64 = 50;
 
 pub async fn list_comments(
     State(state): State<AppState>,
-    _auth: AuthUser,
+    auth: AuthUser,
     Path(upload_id): Path<Uuid>,
     Query(q): Query<ListCommentsQuery>,
 ) -> Result<Json<Vec<CommentDto>>, AppError> {
+    // Event-scope: only list comments for an upload in the caller's event.
+    Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
+        .await?
+        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
+
     let comments =
         Comment::list_for_upload(&state.pool, upload_id, q.before, COMMENT_PAGE_SIZE).await?;
     Ok(Json(comments))
@@ -91,6 +136,15 @@ pub async fn add_comment(
         return Err(AppError::Forbidden("Du bist gesperrt.".into()));
     }
 
+    // Event-scope: only comment on an upload that belongs to the caller's event.
+    Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
+        .await?
+        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
+
+    // NOTE: commenting is intentionally allowed while the event is locked. Locking
+    // freezes *new uploads* only — likes, comments and browsing stay open
+    // (USER_JOURNEYS §9.3, FEATURES capability matrix).
+
     let text = body.body.trim();
     let text_chars = text.chars().count();
     if text_chars == 0 || text_chars > 500 {
@@ -99,26 +153,41 @@ pub async fn add_comment(
         ));
     }
 
-    let comment = Comment::create(&state.pool, upload_id, auth.user_id, text).await?;
-
-    // Process hashtags in comment body
+    // Insert the comment and link its hashtags atomically, so a crash mid-loop
+    // can't leave a committed comment with only some of its tags indexed.
     let tags = hashtag::extract_hashtags(text);
+    let mut tx = state.pool.begin().await?;
+    let comment = Comment::create(&mut *tx, upload_id, auth.user_id, text).await?;
     for tag in &tags {
-        let h = Hashtag::upsert(&state.pool, auth.event_id, tag).await?;
+        let h = Hashtag::upsert(&mut *tx, auth.event_id, tag).await?;
         sqlx::query(
             "INSERT INTO comment_hashtag (comment_id, hashtag_id) VALUES ($1, $2) ON CONFLICT DO NOTHING",
         )
         .bind(comment.id)
         .bind(h.id)
-        .execute(&state.pool)
+        .execute(&mut *tx)
         .await?;
     }
+    tx.commit().await?;
 
-    // Broadcast SSE
-    let _ = state.sse_tx.send(crate::state::SseEvent {
-        event_type: "new-comment".to_string(),
-        data: serde_json::json!({ "upload_id": upload_id }).to_string(),
-    });
+    // Fresh count so feed clients can patch the single card in place instead of
+    // refetching page 1 (mirrors v_feed.comment_count = COUNT(DISTINCT c.id); COUNT(*)
+    // over the same deleted_at filter is identical since comment.id is the PK). The
+    // count + broadcast are a UI optimisation — the comment is already committed, so a
+    // failure here must not fail the request. Swallow the error and skip the broadcast.
+    if let Ok(comment_count) = sqlx::query_scalar::<_, i64>(
+        "SELECT COUNT(*) FROM comment WHERE upload_id = $1 AND deleted_at IS NULL",
+    )
+    .bind(upload_id)
+    .fetch_one(&state.pool)
+    .await
+    {
+        let _ = state.sse_tx.send(crate::state::SseEvent {
+            event_type: "new-comment".to_string(),
+            data: serde_json::json!({ "upload_id": upload_id, "comment_count": comment_count })
+                .to_string(),
+        });
+    }
 
     let dto = CommentDto {
         id: comment.id,
@@ -137,6 +206,10 @@ pub async fn delete_comment(
     auth: AuthUser,
     Path(comment_id): Path<Uuid>,
 ) -> Result<StatusCode, AppError> {
+    // Banned users keep read access but cannot mutate (USER_JOURNEYS §10).
+    if auth.is_banned {
+        return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+    }
     let comment = Comment::find_by_id(&state.pool, comment_id)
         .await?
         .ok_or_else(|| AppError::NotFound("Kommentar nicht gefunden.".into()))?;
@@ -145,6 +218,15 @@ pub async fn delete_comment(
         return Err(AppError::Forbidden("Nur eigene Kommentare löschen.".into()));
     }
 
-    Comment::soft_delete(&state.pool, comment_id).await?;
+    // Event-scope: soft_delete_in_event only matches comments whose upload is in
+    // the caller's event, so a cross-event comment_id resolves to a 404 here.
+    let deleted = Comment::soft_delete_in_event(&state.pool, comment_id, auth.event_id).await?;
+    if !deleted {
+        return Err(AppError::NotFound("Kommentar nicht gefunden.".into()));
+    }
+    let _ = state.sse_tx.send(crate::state::SseEvent::new(
+        "comment-deleted",
+        serde_json::json!({ "comment_id": comment_id, "upload_id": comment.upload_id }).to_string(),
+    ));
     Ok(StatusCode::NO_CONTENT)
 }

backend/src/handlers/sse.rs

@@ -6,6 +6,7 @@ use axum::response::sse::{Event, KeepAlive, Sse};
 use axum::Json;
 use futures::stream::Stream;
 use serde::{Deserialize, Serialize};
+use tokio_stream::wrappers::errors::BroadcastStreamRecvError;
 use tokio_stream::wrappers::BroadcastStream;
 use tokio_stream::StreamExt;
 
@@ -22,6 +23,10 @@ pub struct SseQuery {
 #[derive(Serialize)]
 pub struct StreamTicketResponse {
     pub ticket: String,
+    /// Server clock at mint time — the client seeds its SSE reconnect cursor from this
+    /// instead of `new Date()`, so a skewed browser clock can't drop uploads. See
+    /// `DeltaResponse::server_time`.
+    pub server_time: chrono::DateTime<chrono::Utc>,
 }
 
 /// Mint a short-lived single-use SSE ticket. The browser's `EventSource` cannot
@@ -32,9 +37,12 @@ pub struct StreamTicketResponse {
 pub async fn issue_ticket(
     State(state): State<AppState>,
     auth: AuthUser,
-) -> Json<StreamTicketResponse> {
+) -> Result<Json<StreamTicketResponse>, AppError> {
     let ticket = state.sse_tickets.issue(auth.token_hash);
-    Json(StreamTicketResponse { ticket })
+    let server_time = sqlx::query_scalar("SELECT NOW()")
+        .fetch_one(&state.pool)
+        .await?;
+    Ok(Json(StreamTicketResponse { ticket, server_time }))
 }
 
 /// SSE stream endpoint. Authenticates via a single-use ticket (see
@@ -48,19 +56,57 @@ pub async fn stream(
         .consume(&q.ticket)
         .ok_or_else(|| AppError::Unauthorized("Ticket ungültig oder abgelaufen.".into()))?;
 
+    // NOTE: this authenticates via ticket→session, not the `AuthUser` extractor. The
+    // SSE stream is read-only, and under the read-only-ban model (USER_JOURNEYS §10)
+    // banned users retain read access — so both minting a ticket and holding a stream
+    // open are intentionally allowed for banned users; only writes are blocked.
     Session::find_by_token_hash(&state.pool, &token_hash)
         .await
         .map_err(|e| AppError::Internal(e.into()))?
         .ok_or_else(|| AppError::Unauthorized("Sitzung nicht gefunden.".into()))?;
 
     let rx = state.sse_tx.subscribe();
-    let stream = BroadcastStream::new(rx).filter_map(|msg| match msg {
+    let events = BroadcastStream::new(rx).filter_map(|msg| match msg {
         Ok(sse_event) => Some(Ok(Event::default()
             .event(sse_event.event_type)
             .data(sse_event.data))),
-        Err(_) => None,
+        // A consumer that falls behind the broadcast buffer would otherwise silently
+        // lose events, leaving its feed permanently stale. Instead of dropping the
+        // gap, tell the client to resync — the frontend responds by running a full
+        // feed-delta fetch (which reconciles both new uploads and deletions).
+        Err(BroadcastStreamRecvError::Lagged(n)) => {
+            tracing::warn!("SSE consumer lagged, dropped {n} event(s); emitting resync");
+            Some(Ok(Event::default().event("resync").data(n.to_string())))
+        }
     });
 
+    // The session is only checked once at open. Re-validate it periodically so a
+    // logged-out, expired, OR banned session's stream is closed rather than kept alive
+    // until the client happens to disconnect. Bounds a stale stream to ~60s. Banning
+    // already revokes the user's sessions (so the row is gone), but re-reading the live
+    // user row and dropping on `is_banned` is a cheap defense-in-depth. Only a
+    // *definitive* gone/expired/banned state ends the stream; a transient DB error just
+    // retries next tick.
+    let pool = state.pool.clone();
+    let session_hash = token_hash.clone();
+    let session_gone = async move {
+        let mut ticker = tokio::time::interval(Duration::from_secs(60));
+        ticker.tick().await; // consume the immediate first tick
+        loop {
+            ticker.tick().await;
+            match Session::find_user_by_token_hash(&pool, &session_hash).await {
+                Ok(Some(user)) if !user.is_banned => {} // still valid — keep streaming
+                Ok(Some(_)) => break,                   // banned — cut the stream
+                Ok(None) => break,                      // logged out or expired — stop
+                Err(e) => {
+                    tracing::warn!(error = ?e, "SSE session revalidation query failed; retrying");
+                }
+            }
+        }
+    };
+
+    let stream = futures::StreamExt::take_until(events, Box::pin(session_gone));
+
     Ok(Sse::new(stream).keep_alive(
         KeepAlive::new()
             .interval(Duration::from_secs(30))

backend/src/handlers/test_admin.rs

@@ -70,10 +70,21 @@ pub async fn truncate_all(
     let _ = tokio::fs::remove_dir_all(&state.config.media_path).await;
     let _ = tokio::fs::create_dir_all(&state.config.media_path).await;
 
+    // Wipe the export directory too. Exports moved OUT of media_path (CR2 fix), so
+    // the media wipe above no longer covers them — without this a real export in
+    // one test would leave Gallery.zip on disk and contaminate the next.
+    let _ = tokio::fs::remove_dir_all(&state.config.export_path).await;
+    let _ = tokio::fs::create_dir_all(&state.config.export_path).await;
+
     // The rate limiter holds an in-memory HashMap; clear it so a previous test's
     // counters don't leak into the next one.
     state.rate_limiter.clear();
 
+    // The reseed above wrote the `config` table directly (bypassing patch_config), so
+    // the cache must be invalidated too — otherwise the first request after a truncate
+    // could serve the previous test's toggles.
+    state.config_cache.invalidate();
+
     Ok(StatusCode::NO_CONTENT)
 }
 

backend/src/handlers/upload.rs

@@ -16,16 +16,37 @@ use crate::state::AppState;
 
 const MAX_CAPTION_LENGTH: usize = 2000;
 
+/// Allowlist of accepted media types, keyed by the MIME that `infer` derives from
+/// the file's magic bytes. The detected MIME (not the client-declared one) is what
+/// we trust, store, and hand to the compression pipeline — so a text-based payload
+/// (SVG/HTML/JS) can never be stored or served on-origin. Each entry maps to the
+/// server-controlled file extension we persist the original under.
+///
+/// HEIC/HEIF are deliberately excluded: the preview pipeline (`image` crate, and
+/// the bundled ffmpeg 6.1) cannot decode them, so accepting them would store files
+/// that never get a thumbnail. iOS Safari already transcodes HEIC→JPEG when a photo
+/// is selected via a file input, so this rejects only the rare HEIC-preserving
+/// upload path — with a clear error rather than a silently broken post.
+const ALLOWED_MEDIA: &[(&str, &str)] = &[
+    ("image/jpeg", "jpg"),
+    ("image/png", "png"),
+    ("image/webp", "webp"),
+    ("image/gif", "gif"),
+    ("video/mp4", "mp4"),
+    ("video/quicktime", "mov"),
+    ("video/webm", "webm"),
+];
+
 pub async fn upload(
     State(state): State<AppState>,
     auth: AuthUser,
     mut multipart: Multipart,
 ) -> Result<(StatusCode, Json<UploadDto>), AppError> {
     // Rate limit: N uploads per hour per user. Gated by master + per-endpoint toggles.
-    let rate_limits_on = config::get_bool(&state.pool, "rate_limits_enabled", true).await;
-    let upload_rate_on = config::get_bool(&state.pool, "upload_rate_enabled", true).await;
+    let rate_limits_on = config::get_bool(&state.config_cache, "rate_limits_enabled", true).await;
+    let upload_rate_on = config::get_bool(&state.config_cache, "upload_rate_enabled", true).await;
     if rate_limits_on && upload_rate_on {
-        let upload_rate = config::get_i64(&state.pool, "upload_rate_per_hour", 10).await as usize;
+        let upload_rate = config::get_i64(&state.config_cache, "upload_rate_per_hour", 10).await as usize;
         if let Err(retry_after_secs) = state.rate_limiter.check_with_retry(
             format!("upload:{}", auth.user_id),
             upload_rate,
@@ -56,54 +77,94 @@ pub async fn upload(
         drain_multipart(multipart).await;
         return Err(AppError::Forbidden("Uploads sind gesperrt.".into()));
     }
+    // Belt-and-suspenders on top of the lock (release ⇒ lock): once the gallery is
+    // released the export has been snapshotted, so a late upload could never make it into
+    // the keepsake. Reject it explicitly rather than silently diverging the live feed.
+    if event.export_released_at.is_some() {
+        drain_multipart(multipart).await;
+        return Err(AppError::Forbidden("Galerie wurde bereits freigegeben.".into()));
+    }
 
     // Read config limits from DB
-    let max_image_mb: i64 = config::get_i64(&state.pool, "max_image_size_mb", 20).await;
-    let max_video_mb: i64 = config::get_i64(&state.pool, "max_video_size_mb", 500).await;
+    let max_image_mb: i64 = config::get_i64(&state.config_cache, "max_image_size_mb", 20).await;
+    let max_video_mb: i64 = config::get_i64(&state.config_cache, "max_video_size_mb", 500).await;
 
-    let mut file_data: Option<Vec<u8>> = None;
-    let mut file_name: Option<String> = None;
-    let mut content_type: Option<String> = None;
+    // The uploaded file is streamed straight to a temp file on disk (never buffered
+    // whole in memory — a 500 MB video used to cost 500 MB of RAM per concurrent
+    // upload). We only keep the first ≤512 bytes in memory for magic-byte sniffing.
+    // On success the temp file is renamed into place under its detected extension.
+    let upload_id = Uuid::new_v4();
+    let event_slug = &state.config.event_slug;
+    let originals_dir = state.config.media_path.join(format!("originals/{event_slug}"));
+    let temp_abs = originals_dir.join(format!("{upload_id}.tmp"));
+
+    let mut streamed: Option<(i64, Vec<u8>)> = None; // (size, head bytes for sniffing)
     let mut caption: Option<String> = None;
     let mut hashtags_csv: Option<String> = None;
 
-    while let Some(field) = multipart.next_field().await.map_err(|e| AppError::BadRequest(e.to_string()))? {
-        let name = field.name().unwrap_or_default().to_string();
-        match name.as_str() {
-            "file" => {
-                file_name = field.file_name().map(|s| s.to_string());
-                content_type = field.content_type().map(|s| s.to_string());
-                file_data = Some(
-                    field.bytes().await
-                        .map_err(|e| AppError::BadRequest(format!("Datei konnte nicht gelesen werden: {e}")))?
-                        .to_vec(),
-                );
+    // Wrap the multipart read so any error after the temp file is created still cleans
+    // it up (a mid-stream parse failure must not leave a stray `.tmp` on disk).
+    let parse_result: Result<(), AppError> = async {
+        while let Some(field) = multipart
+            .next_field()
+            .await
+            .map_err(|e| AppError::BadRequest(e.to_string()))?
+        {
+            let name = field.name().unwrap_or_default().to_string();
+            match name.as_str() {
+                "file" => {
+                    // The client-declared Content-Type does NOT determine the stored
+                    // MIME/extension — those come from the file's magic bytes below. The
+                    // declared type only picks the streaming cap so an oversized body is
+                    // aborted early; a mislabelled type only makes the cap *stricter*
+                    // (safe), and the authoritative per-class check still runs on the
+                    // detected type.
+                    let declared = field.content_type().unwrap_or("").to_string();
+                    let cap_bytes = if declared.starts_with("video/") {
+                        (max_video_mb * 1024 * 1024) as usize
+                    } else if declared.starts_with("image/") {
+                        (max_image_mb * 1024 * 1024) as usize
+                    } else {
+                        (max_image_mb.max(max_video_mb) * 1024 * 1024) as usize
+                    };
+                    tokio::fs::create_dir_all(&originals_dir)
+                        .await
+                        .map_err(|e| AppError::Internal(e.into()))?;
+                    streamed = Some(stream_field_to_file(field, &temp_abs, cap_bytes).await?);
+                }
+                "caption" => {
+                    caption =
+                        Some(field.text().await.map_err(|e| AppError::BadRequest(e.to_string()))?);
+                }
+                "hashtags" => {
+                    hashtags_csv =
+                        Some(field.text().await.map_err(|e| AppError::BadRequest(e.to_string()))?);
+                }
+                _ => {}
             }
-            "caption" => {
-                caption = Some(
-                    field.text().await
-                        .map_err(|e| AppError::BadRequest(e.to_string()))?,
-                );
-            }
-            "hashtags" => {
-                hashtags_csv = Some(
-                    field.text().await
-                        .map_err(|e| AppError::BadRequest(e.to_string()))?,
-                );
-            }
-            _ => {}
         }
+        Ok(())
+    }
+    .await;
+
+    if let Err(e) = parse_result {
+        let _ = tokio::fs::remove_file(&temp_abs).await;
+        return Err(e);
     }
 
-    let data = file_data.ok_or_else(|| AppError::BadRequest("Keine Datei hochgeladen.".into()))?;
-    let mime = content_type.unwrap_or_else(|| "application/octet-stream".to_string());
-    let size = data.len() as i64;
+    // From here on the temp file may exist; every validation failure removes it before
+    // returning so a rejected upload never leaves bytes behind.
+    let (size, head) = match streamed {
+        Some(s) => s,
+        None => return Err(AppError::BadRequest("Keine Datei hochgeladen.".into())),
+    };
 
     // Validate caption length. Counted in chars (code points) to match the
     // "Zeichen" wording in the error message — `.len()` would be bytes and
     // reject perfectly valid German/emoji captions early.
     if let Some(ref cap) = caption {
         if cap.chars().count() > MAX_CAPTION_LENGTH {
+            let _ = tokio::fs::remove_file(&temp_abs).await;
             return Err(AppError::BadRequest(format!(
                 "Beschreibung ist zu lang. Maximum: {} Zeichen.",
                 MAX_CAPTION_LENGTH
@@ -111,30 +172,43 @@ pub async fn upload(
         }
     }
 
-    // Validate file MIME type using magic bytes
-    let detected_mime = infer::get(&data);
-    if let Some(detected) = detected_mime {
-        let detected_type = detected.mime_type();
-        // Ensure detected type is compatible with declared MIME type
-        let declared_category = mime.split('/').next().unwrap_or("");
-        let detected_category = detected_type.split('/').next().unwrap_or("");
-
-        // Only reject if categories don't match (e.g., image vs video)
-        if declared_category != "application" && declared_category != detected_category {
+    // Determine the file type from its magic bytes and require it to be on the
+    // allowlist. `infer` returns None for text-based payloads (SVG/HTML/JS), so
+    // those are rejected outright — closing the stored-XSS vector. Both the MIME
+    // we persist and the on-disk extension come from the detected type, never from
+    // client-supplied values.
+    let kind = match infer::get(&head) {
+        Some(k) => k,
+        None => {
+            let _ = tokio::fs::remove_file(&temp_abs).await;
+            return Err(AppError::BadRequest(
+                "Dateityp nicht erkannt oder nicht unterstützt.".into(),
+            ));
+        }
+    };
+    let (mime, ext) = match ALLOWED_MEDIA
+        .iter()
+        .find(|(allowed, _)| *allowed == kind.mime_type())
+        .map(|(m, e)| ((*m).to_string(), *e))
+    {
+        Some(v) => v,
+        None => {
+            let _ = tokio::fs::remove_file(&temp_abs).await;
             return Err(AppError::BadRequest(format!(
-                "Dateiinhalt entspricht nicht dem deklarierten Typ. Erwartet: {}, erkannt: {}",
-                mime, detected_type
+                "Dateityp wird nicht unterstützt: {}.",
+                kind.mime_type()
             )));
         }
-    }
+    };
 
-    // Validate file size
+    // Validate file size against the authoritative per-detected-class limit.
     let max_bytes = if mime.starts_with("video/") {
         max_video_mb * 1024 * 1024
     } else {
         max_image_mb * 1024 * 1024
     };
     if size > max_bytes {
+        let _ = tokio::fs::remove_file(&temp_abs).await;
         return Err(AppError::BadRequest(format!(
             "Datei ist zu groß. Maximum: {} MB.",
             max_bytes / (1024 * 1024)
@@ -144,56 +218,35 @@ pub async fn upload(
     // Per-user storage quota — dynamic formula based on available disk space and the
     // number of active uploaders. Gated by master + per-area toggles so the admin can
     // disable it on trusted instances.
-    let quota_on = config::get_bool(&state.pool, "quota_enabled", true).await;
-    let storage_quota_on = config::get_bool(&state.pool, "storage_quota_enabled", true).await;
+    let quota_on = config::get_bool(&state.config_cache, "quota_enabled", true).await;
+    let storage_quota_on = config::get_bool(&state.config_cache, "storage_quota_enabled", true).await;
+    // When quota is enforced, this holds the byte ceiling so the increment UPDATE below can
+    // enforce it atomically (`WHERE total + size <= limit`). Without that guard, two
+    // concurrent uploads from the same user (e.g. phone + laptop) both pass this stale
+    // pre-check and both increment, blowing past the quota. The pre-check stays as a
+    // fast path that avoids the disk write when the user is already clearly over.
+    let mut quota_limit: Option<i64> = None;
     if quota_on && storage_quota_on {
         let estimate = compute_storage_quota(&state).await;
         if let Some(limit) = estimate.limit_bytes {
+            quota_limit = Some(limit);
             let prospective_total = user.total_upload_bytes.saturating_add(size);
             if prospective_total > limit {
-                return Err(AppError::TooManyRequests(
+                let _ = tokio::fs::remove_file(&temp_abs).await;
+                return Err(AppError::QuotaExceeded(
                     "Du hast dein Upload-Limit für dieses Event erreicht.".into(),
-                    None,
                 ));
             }
         }
     }
 
-    // Determine file extension
-    let ext = file_name
-        .as_deref()
-        .and_then(|n| n.rsplit('.').next())
-        .unwrap_or(if mime.starts_with("video/") { "mp4" } else { "jpg" });
-
-    let upload_id = Uuid::new_v4();
-    let event_slug = &state.config.event_slug;
+    // All checks passed — atomically move the temp file to its final, extension-correct
+    // path (same directory, so the rename is cheap and atomic).
     let relative_path = format!("originals/{event_slug}/{upload_id}.{ext}");
     let absolute_path = state.config.media_path.join(&relative_path);
-
-    // Ensure directory exists and write file
-    if let Some(parent) = absolute_path.parent() {
-        tokio::fs::create_dir_all(parent).await.map_err(|e| AppError::Internal(e.into()))?;
-    }
-    tokio::fs::write(&absolute_path, &data).await.map_err(|e| AppError::Internal(e.into()))?;
-
-    // Update user's total upload bytes
-    sqlx::query("UPDATE \"user\" SET total_upload_bytes = total_upload_bytes + $2 WHERE id = $1")
-        .bind(auth.user_id)
-        .bind(size)
-        .execute(&state.pool)
-        .await?;
-
-    // Insert upload record
-    let upload = Upload::create(
-        &state.pool,
-        auth.event_id,
-        auth.user_id,
-        &relative_path,
-        &mime,
-        size,
-        caption.as_deref(),
-    )
-    .await?;
+    tokio::fs::rename(&temp_abs, &absolute_path)
+        .await
+        .map_err(|e| AppError::Internal(e.into()))?;
 
     // Process hashtags from caption and explicit CSV
     let mut tags: Vec<String> = Vec::new();
@@ -211,10 +264,66 @@ pub async fn upload(
     tags.sort();
     tags.dedup();
 
-    for tag in &tags {
-        let h = Hashtag::upsert(&state.pool, auth.event_id, tag).await?;
-        Hashtag::link_to_upload(&state.pool, upload.id, h.id).await?;
+    // Quota accounting, the upload row, and its hashtag links must be atomic: a
+    // crash between the bytes increment and the insert would permanently charge
+    // bytes with no row to reclaim them (silent quota erosion / spurious lockout).
+    let tx_result: Result<Upload, AppError> = async {
+        let mut tx = state.pool.begin().await?;
+        // Increment the user's byte total. When a quota is in force, guard it atomically
+        // (`total + size <= limit`) so two concurrent uploads can't both slip past the
+        // stale pre-check — the loser's UPDATE matches 0 rows and we abort with the same
+        // terminal quota error (the tx rolls back on drop; the on-disk file is cleaned by
+        // the error path below).
+        let inc = if let Some(limit) = quota_limit {
+            sqlx::query(
+                "UPDATE \"user\" SET total_upload_bytes = total_upload_bytes + $2
+                 WHERE id = $1 AND total_upload_bytes + $2 <= $3",
+            )
+            .bind(auth.user_id)
+            .bind(size)
+            .bind(limit)
+            .execute(&mut *tx)
+            .await?
+        } else {
+            sqlx::query("UPDATE \"user\" SET total_upload_bytes = total_upload_bytes + $2 WHERE id = $1")
+                .bind(auth.user_id)
+                .bind(size)
+                .execute(&mut *tx)
+                .await?
+        };
+        if inc.rows_affected() == 0 {
+            return Err(AppError::QuotaExceeded(
+                "Du hast dein Upload-Limit für dieses Event erreicht.".into(),
+            ));
+        }
+        let upload = Upload::create(
+            &mut *tx,
+            auth.event_id,
+            auth.user_id,
+            &relative_path,
+            &mime,
+            size,
+            caption.as_deref(),
+        )
+        .await?;
+        for tag in &tags {
+            let h = Hashtag::upsert(&mut *tx, auth.event_id, tag).await?;
+            Hashtag::link_to_upload(&mut *tx, upload.id, h.id).await?;
+        }
+        tx.commit().await?;
+        Ok(upload)
     }
+    .await;
+
+    // The file is already on disk at `absolute_path`. If the transaction failed, no DB
+    // row will ever reference it, so remove it now rather than orphan bytes on disk.
+    let upload = match tx_result {
+        Ok(u) => u,
+        Err(e) => {
+            let _ = tokio::fs::remove_file(&absolute_path).await;
+            return Err(e);
+        }
+    };
 
     // Spawn compression task
     state
@@ -257,7 +366,11 @@ pub async fn edit_upload(
     Path(upload_id): Path<Uuid>,
     Json(body): Json<EditUploadRequest>,
 ) -> Result<StatusCode, AppError> {
-    let upload = Upload::find_by_id(&state.pool, upload_id)
+    // Banned users keep read access but cannot mutate (USER_JOURNEYS §10).
+    if auth.is_banned {
+        return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+    }
+    let upload = Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
         .await?
         .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
 
@@ -265,17 +378,20 @@ pub async fn edit_upload(
         return Err(AppError::Forbidden("Nur eigene Uploads bearbeiten.".into()));
     }
 
+    // Caption update + hashtag wipe-then-relink in one transaction, so a crash
+    // mid-relink can't leave the upload with its hashtags stripped.
+    let mut tx = state.pool.begin().await?;
     if let Some(ref caption) = body.caption {
-        Upload::update_caption(&state.pool, upload_id, Some(caption)).await?;
+        Upload::update_caption(&mut *tx, upload_id, Some(caption)).await?;
     }
-
     if let Some(ref hashtags) = body.hashtags {
-        Hashtag::unlink_all_from_upload(&state.pool, upload_id).await?;
+        Hashtag::unlink_all_from_upload(&mut *tx, upload_id).await?;
         for tag in hashtags {
-            let h = Hashtag::upsert(&state.pool, auth.event_id, tag).await?;
-            Hashtag::link_to_upload(&state.pool, upload_id, h.id).await?;
+            let h = Hashtag::upsert(&mut *tx, auth.event_id, tag).await?;
+            Hashtag::link_to_upload(&mut *tx, upload_id, h.id).await?;
         }
     }
+    tx.commit().await?;
 
     Ok(StatusCode::OK)
 }
@@ -285,7 +401,11 @@ pub async fn delete_upload(
     auth: AuthUser,
     Path(upload_id): Path<Uuid>,
 ) -> Result<StatusCode, AppError> {
-    let upload = Upload::find_by_id(&state.pool, upload_id)
+    // Banned users keep read access but cannot mutate (USER_JOURNEYS §10).
+    if auth.is_banned {
+        return Err(AppError::Forbidden("Du bist gesperrt.".into()));
+    }
+    let upload = Upload::find_by_id_and_event(&state.pool, upload_id, auth.event_id)
         .await?
         .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
 
@@ -293,11 +413,83 @@ pub async fn delete_upload(
         return Err(AppError::Forbidden("Nur eigene Uploads löschen.".into()));
     }
 
-    Upload::soft_delete(&state.pool, upload_id).await?;
+    Upload::soft_delete_in_event(&state.pool, upload_id, auth.event_id).await?;
+
+    // Evict the card live on every other feed + the projector diashow — otherwise
+    // a self-deleted post lingers until each viewer manually reloads. Same event
+    // the host-delete path already emits and the frontend already handles.
+    let _ = state.sse_tx.send(crate::state::SseEvent::new(
+        "upload-deleted",
+        serde_json::json!({ "upload_id": upload_id }).to_string(),
+    ));
 
     Ok(StatusCode::NO_CONTENT)
 }
 
+/// Number of leading bytes retained in memory for magic-byte (`infer`) sniffing. Every
+/// allowed type's signature sits well within this; 512 is comfortably generous.
+const HEAD_SNIFF_BYTES: usize = 512;
+
+/// Stream a multipart field straight to `dest`, aborting with a 400 the moment it
+/// exceeds `max_bytes`. Only the first [`HEAD_SNIFF_BYTES`] bytes are kept in memory
+/// (for type detection); the rest goes chunk-by-chunk to disk, so peak memory is a
+/// single chunk rather than the whole file. Returns `(total_size, head_bytes)`. On any
+/// error the partial temp file is removed so no stray `.tmp` is left behind.
+async fn stream_field_to_file(
+    mut field: axum::extract::multipart::Field<'_>,
+    dest: &std::path::Path,
+    max_bytes: usize,
+) -> Result<(i64, Vec<u8>), AppError> {
+    use tokio::io::AsyncWriteExt;
+
+    let mut file = tokio::fs::File::create(dest)
+        .await
+        .map_err(|e| AppError::Internal(e.into()))?;
+    let mut total: usize = 0;
+    let mut head: Vec<u8> = Vec::with_capacity(HEAD_SNIFF_BYTES);
+
+    loop {
+        let chunk = match field.chunk().await {
+            Ok(Some(c)) => c,
+            Ok(None) => break,
+            Err(e) => {
+                let _ = file.shutdown().await;
+                let _ = tokio::fs::remove_file(dest).await;
+                return Err(AppError::BadRequest(format!(
+                    "Datei konnte nicht gelesen werden: {e}"
+                )));
+            }
+        };
+
+        total = total.saturating_add(chunk.len());
+        if total > max_bytes {
+            let _ = file.shutdown().await;
+            let _ = tokio::fs::remove_file(dest).await;
+            return Err(AppError::BadRequest(format!(
+                "Datei ist zu groß. Maximum: {} MB.",
+                max_bytes / (1024 * 1024)
+            )));
+        }
+
+        if head.len() < HEAD_SNIFF_BYTES {
+            let need = HEAD_SNIFF_BYTES - head.len();
+            head.extend_from_slice(&chunk[..need.min(chunk.len())]);
+        }
+
+        if let Err(e) = file.write_all(&chunk).await {
+            let _ = tokio::fs::remove_file(dest).await;
+            return Err(AppError::Internal(e.into()));
+        }
+    }
+
+    if let Err(e) = file.flush().await {
+        let _ = tokio::fs::remove_file(dest).await;
+        return Err(AppError::Internal(e.into()));
+    }
+
+    Ok((total as i64, head))
+}
+
 /// Drain a multipart body so the HTTP connection stays clean when returning an early error.
 /// Without draining, the client may still be sending the body after we've sent our response,
 /// which can corrupt the keep-alive connection for subsequent requests.
@@ -317,14 +509,21 @@ pub struct QuotaEstimate {
     pub tolerance: f64,
 }
 
+/// Pure per-user quota formula: `floor((free_disk * tolerance) / max(active, 1))`.
+/// Extracted from `compute_storage_quota` so it's unit-testable without a DB or disk.
+fn quota_limit_bytes(free_disk: i64, tolerance: f64, active_uploaders: i64) -> i64 {
+    let active = active_uploaders.max(1);
+    ((free_disk as f64 * tolerance) / active as f64).floor() as i64
+}
+
 /// Computes the per-user storage quota using
 /// `floor((free_disk * tolerance) / max(active_uploaders, 1))`. Returns `limit_bytes =
 /// None` whenever the storage quota is currently disabled — callers should skip the
 /// check (upload handler) or hide the UI (quota endpoint).
 pub async fn compute_storage_quota(state: &AppState) -> QuotaEstimate {
-    let quota_on = config::get_bool(&state.pool, "quota_enabled", true).await;
-    let storage_quota_on = config::get_bool(&state.pool, "storage_quota_enabled", true).await;
-    let tolerance = config::get_f64(&state.pool, "quota_tolerance", 0.75).await;
+    let quota_on = config::get_bool(&state.config_cache, "quota_enabled", true).await;
+    let storage_quota_on = config::get_bool(&state.config_cache, "storage_quota_enabled", true).await;
+    let tolerance = config::get_f64(&state.config_cache, "quota_tolerance", 0.75).await;
 
     let (active_count,): (i64,) = sqlx::query_as(
         "SELECT COUNT(DISTINCT user_id) FROM upload WHERE deleted_at IS NULL",
@@ -334,21 +533,23 @@ pub async fn compute_storage_quota(state: &AppState) -> QuotaEstimate {
     .unwrap_or((0,));
     let active = active_count.max(1);
 
-    let media_path = state.config.media_path.to_string_lossy().to_string();
-    let free_disk = sysinfo::Disks::new_with_refreshed_list()
-        .iter()
-        .find(|d| media_path.starts_with(d.mount_point().to_string_lossy().as_ref()))
-        .map(|d| d.available_space())
-        .unwrap_or_else(|| {
-            sysinfo::Disks::new_with_refreshed_list()
-                .iter()
-                .find(|d| d.mount_point().to_string_lossy() == "/")
-                .map(|d| d.available_space())
-                .unwrap_or(0)
-        }) as i64;
+    // Cached disk reading. `None` means we couldn't resolve the media filesystem.
+    let disk = state.disk_cache.snapshot(&state.config.media_path);
+    let free_disk = disk.map(|d| d.free as i64).unwrap_or(0);
 
     let limit_bytes = if quota_on && storage_quota_on {
-        Some(((free_disk as f64 * tolerance) / active as f64).floor() as i64)
+        match disk {
+            Some(d) => Some(quota_limit_bytes(d.free as i64, tolerance, active)),
+            // Fail OPEN, not closed: if the disk can't be read we don't know the real
+            // free space, and enforcing a 0-byte limit would reject every upload with a
+            // spurious "quota reached". Skip enforcement this round and warn instead.
+            None => {
+                tracing::warn!(
+                    "disk snapshot unavailable; skipping storage-quota enforcement this round"
+                );
+                None
+            }
+        }
     } else {
         None
     };
@@ -361,34 +562,26 @@ pub async fn compute_storage_quota(state: &AppState) -> QuotaEstimate {
     }
 }
 
-/// Streaming download of the original file behind an upload. Used by:
-///   - the per-post "Original anzeigen" context action (`window.open`)
-///   - `<img src>` / `<video src>` in the feed, lightbox, and diashow when the user is in
-///     Data Mode = Original
-///
-/// **Auth model:** the route is intentionally unauthenticated, matching how the rest of
-/// `/media/*` is served (preview + thumbnail variants). The URL contains the upload's
-/// UUID, which is unguessable — same security posture as `/media/originals/{slug}/{id}`.
-/// Adding `Authorization: Bearer` here would make the endpoint unusable from `<img src>`
-/// and `window.open`, defeating the purpose of having the alias.
-pub async fn get_original(
-    State(state): State<AppState>,
-    Path(upload_id): Path<Uuid>,
+/// Stream a media file from disk into an HTTP response with a fixed set of security
+/// headers. Every media response (original, preview, thumbnail) goes through here so
+/// they consistently carry `X-Content-Type-Options: nosniff` (defense-in-depth against
+/// content-type confusion, even if the edge proxy is bypassed) plus an explicit
+/// `Content-Disposition` and `Cache-Control`.
+async fn stream_media_file(
+    absolute: &std::path::Path,
+    content_type: String,
+    disposition: &str,
+    cache_control: &str,
 ) -> Result<axum::response::Response, AppError> {
-    let upload = Upload::find_by_id(&state.pool, upload_id)
-        .await?
-        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
-
-    let absolute = state.config.media_path.join(&upload.original_path);
-    if !absolute.exists() {
-        return Err(AppError::NotFound("Datei nicht gefunden.".into()));
-    }
-
     use axum::body::Body;
     use axum::http::{header, Response, StatusCode};
     use tokio_util::io::ReaderStream;
 
-    let file = tokio::fs::File::open(&absolute)
+    if !absolute.exists() {
+        return Err(AppError::NotFound("Datei nicht gefunden.".into()));
+    }
+
+    let file = tokio::fs::File::open(absolute)
         .await
         .map_err(|e| AppError::Internal(e.into()))?;
     let metadata = file
@@ -397,17 +590,118 @@ pub async fn get_original(
         .map_err(|e| AppError::Internal(e.into()))?;
     let stream = ReaderStream::new(file);
 
+    Response::builder()
+        .status(StatusCode::OK)
+        .header(header::CONTENT_TYPE, content_type)
+        .header(header::CONTENT_DISPOSITION, disposition)
+        .header(header::CONTENT_LENGTH, metadata.len())
+        .header(header::CACHE_CONTROL, cache_control)
+        .header(header::X_CONTENT_TYPE_OPTIONS, "nosniff")
+        .body(Body::from_stream(stream))
+        .map_err(|e| AppError::Internal(e.into()))
+}
+
+/// Streaming download of the original file behind an upload. Used by:
+///   - the per-post "Original anzeigen" context action (`window.open`)
+///   - `<img src>` / `<video src>` in the feed, lightbox, and diashow when the user is in
+///     Data Mode = Original
+///
+/// **Auth model:** the route is intentionally unauthenticated so it works from
+/// `<img src>` / `window.open`. The URL contains the upload's unguessable UUID. Unlike
+/// raw `/media` files, this alias is the *only* way to fetch an original: direct
+/// `/media/originals/**` access is blocked in the router, and this handler filters out
+/// soft-deleted and ban-hidden uploads (via `find_visible_media`) so moderation actually
+/// removes access to content. Preview and thumbnail variants are gated the same way (see
+/// [`get_preview`] / [`get_thumbnail`]).
+pub async fn get_original(
+    State(state): State<AppState>,
+    Path(upload_id): Path<Uuid>,
+) -> Result<axum::response::Response, AppError> {
+    let media = Upload::find_visible_media(&state.pool, upload_id)
+        .await?
+        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
+
+    let absolute = state.config.media_path.join(&media.original_path);
     let filename = absolute
         .file_name()
         .and_then(|n| n.to_str())
         .unwrap_or("original");
     let disposition = format!("attachment; filename=\"{filename}\"");
 
-    Response::builder()
-        .status(StatusCode::OK)
-        .header(header::CONTENT_TYPE, upload.mime_type)
-        .header(header::CONTENT_DISPOSITION, disposition)
-        .header(header::CONTENT_LENGTH, metadata.len())
-        .body(Body::from_stream(stream))
-        .map_err(|e| AppError::Internal(e.into()))
+    // Full-res original: force download, never cache at the edge.
+    stream_media_file(&absolute, media.mime_type, &disposition, "no-store").await
+}
+
+/// Streaming access to an upload's compressed **preview** image. Gated exactly like
+/// [`get_original`]: `find_visible_media` drops soft-deleted / ban-hidden uploads, so a
+/// deleted or moderated post's preview 404s here even though the file may still be on
+/// disk. Direct `/media/previews/**` is blocked in the router, making this the only path
+/// to a preview.
+///
+/// Served inline (it's an `<img src>`) and privately cacheable for a short window. The
+/// window is intentionally short (5 min) so a moderated image stops being served to a
+/// direct-URL holder promptly; the live feed already evicts the card instantly via the
+/// `upload-deleted` / `user-hidden` SSE events, so this only bounds the raw-URL edge case.
+pub async fn get_preview(
+    State(state): State<AppState>,
+    Path(upload_id): Path<Uuid>,
+) -> Result<axum::response::Response, AppError> {
+    let media = Upload::find_visible_media(&state.pool, upload_id)
+        .await?
+        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
+    let rel = media
+        .preview_path
+        .ok_or_else(|| AppError::NotFound("Vorschau nicht verfügbar.".into()))?;
+    let absolute = state.config.media_path.join(&rel);
+    stream_media_file(&absolute, "image/jpeg".to_string(), "inline", "private, max-age=300").await
+}
+
+/// Streaming access to an upload's **thumbnail** (video poster). Gated identically to
+/// [`get_preview`].
+pub async fn get_thumbnail(
+    State(state): State<AppState>,
+    Path(upload_id): Path<Uuid>,
+) -> Result<axum::response::Response, AppError> {
+    let media = Upload::find_visible_media(&state.pool, upload_id)
+        .await?
+        .ok_or_else(|| AppError::NotFound("Upload nicht gefunden.".into()))?;
+    let rel = media
+        .thumbnail_path
+        .ok_or_else(|| AppError::NotFound("Thumbnail nicht verfügbar.".into()))?;
+    let absolute = state.config.media_path.join(&rel);
+    stream_media_file(&absolute, "image/jpeg".to_string(), "inline", "private, max-age=300").await
+}
+
+#[cfg(test)]
+mod tests {
+    use super::quota_limit_bytes;
+
+    #[test]
+    fn divides_free_space_by_uploaders_with_tolerance() {
+        // 1000 * 0.75 / 3 = 250
+        assert_eq!(quota_limit_bytes(1000, 0.75, 3), 250);
+    }
+
+    #[test]
+    fn floors_fractional_results() {
+        // 1000 * 0.75 / 7 = 107.14… → 107
+        assert_eq!(quota_limit_bytes(1000, 0.75, 7), 107);
+    }
+
+    #[test]
+    fn active_uploaders_below_one_is_clamped_to_one() {
+        // Guards against divide-by-zero when no one has uploaded yet.
+        assert_eq!(quota_limit_bytes(1000, 1.0, 0), 1000);
+        assert_eq!(quota_limit_bytes(1000, 1.0, -5), 1000);
+    }
+
+    #[test]
+    fn zero_free_disk_yields_zero() {
+        assert_eq!(quota_limit_bytes(0, 0.75, 3), 0);
+    }
+
+    #[test]
+    fn full_tolerance_is_identity_for_a_single_uploader() {
+        assert_eq!(quota_limit_bytes(500, 1.0, 1), 500);
+    }
 }

backend/src/main.rs

@@ -18,6 +18,10 @@ mod state;
 use config::AppConfig;
 use state::AppState;
 
+/// Hard HTTP body cap for the upload endpoint (576 MiB). Backstop against
+/// memory-exhaustion; precise per-class size limits are enforced in the handler.
+const MAX_UPLOAD_BYTES: usize = 576 * 1024 * 1024;
+
 #[tokio::main]
 async fn main() -> Result<()> {
     dotenvy::dotenv().ok();
@@ -40,6 +44,18 @@ async fn main() -> Result<()> {
 
     let state = AppState::new(pool.clone(), config.clone());
 
+    // Re-spawn exports for events that were released but whose keepsake never finished
+    // (crash mid-export). Needs the media/export paths + SSE sender, so it runs here
+    // rather than inside `startup_recovery`. Fire-and-forget: the workers run in the
+    // background; the HTTP server can start accepting requests meanwhile.
+    services::export::recover_exports(
+        pool.clone(),
+        config.media_path.clone(),
+        config.export_path.clone(),
+        state.sse_tx.clone(),
+    )
+    .await;
+
     // Hourly background hygiene: prune expired sessions, evict cold rate-limiter
     // keys. Keeps the DB and process from growing unboundedly over multi-day events.
     services::maintenance::spawn_periodic_tasks(
@@ -53,13 +69,22 @@ async fn main() -> Result<()> {
 
     let api = Router::new()
         // Auth
+        .route("/api/v1/event", get(handlers::public::get_public_event))
         .route("/api/v1/join", post(auth::handlers::join))
         .route("/api/v1/recover", post(auth::handlers::recover))
+        // Forgotten-PIN escape hatch: ask a host to reset it (unauthenticated, throttled).
+        .route("/api/v1/recover/request", post(auth::handlers::request_pin_reset))
         .route("/api/v1/admin/login", post(auth::handlers::admin_login))
         .route("/api/v1/session", delete(auth::handlers::logout))
-        // Upload — body limit disabled; size validation is done inside the handler
+        // "Sign out everywhere" — revoke all of the caller's sessions.
+        .route("/api/v1/sessions", delete(auth::handlers::logout_all))
+        // Upload — HTTP-level body cap as an OOM backstop. The handler still enforces
+        // the precise per-class limits from DB config (max_image/video_size_mb); this
+        // layer just stops a multi-GB body from being buffered into memory before that
+        // check runs. Sized generously above the default 500 MB video limit + multipart
+        // overhead — if an admin raises max_video_size_mb above this, bump MAX_UPLOAD_BYTES.
         .route("/api/v1/upload", post(handlers::upload::upload)
-            .route_layer(DefaultBodyLimit::disable()))
+            .route_layer(DefaultBodyLimit::max(MAX_UPLOAD_BYTES)))
         .route(
             "/api/v1/upload/{id}",
             patch(handlers::upload::edit_upload).delete(handlers::upload::delete_upload),
@@ -68,6 +93,17 @@ async fn main() -> Result<()> {
             "/api/v1/upload/{id}/original",
             get(handlers::upload::get_original),
         )
+        // Preview/thumbnail variants are gated the same way as originals (visibility
+        // check + direct /media block below) so moderation actually revokes access to
+        // the displayed images, not just the full-res download.
+        .route(
+            "/api/v1/upload/{id}/preview",
+            get(handlers::upload::get_preview),
+        )
+        .route(
+            "/api/v1/upload/{id}/thumbnail",
+            get(handlers::upload::get_thumbnail),
+        )
         // Current-user endpoints (live quota estimate, profile + privacy note bundle)
         .route("/api/v1/me/context", get(handlers::me::get_context))
         .route("/api/v1/me/quota", get(handlers::me::get_quota))
@@ -98,10 +134,19 @@ async fn main() -> Result<()> {
             "/api/v1/host/users/{id}/pin-reset",
             post(handlers::host::reset_user_pin),
         )
+        .route(
+            "/api/v1/host/pin-reset-requests",
+            get(handlers::host::list_pin_reset_requests),
+        )
+        .route(
+            "/api/v1/host/pin-reset-requests/{id}",
+            delete(handlers::host::dismiss_pin_reset_request),
+        )
         .route("/api/v1/host/upload/{id}", delete(handlers::host::host_delete_upload))
         .route("/api/v1/host/comment/{id}", delete(handlers::host::host_delete_comment))
         // Export (all authenticated users)
         .route("/api/v1/export/status", get(handlers::admin::export_status))
+        .route("/api/v1/export/ticket", post(handlers::admin::export_ticket))
         .route("/api/v1/export/zip", get(handlers::admin::download_zip))
         .route("/api/v1/export/html", get(handlers::admin::download_html))
         // Admin Dashboard
@@ -135,13 +180,95 @@ async fn main() -> Result<()> {
     let router = Router::new()
         .route("/health", get(|| async { "ok" }))
         .merge(api)
+        // Block direct HTTP access to ALL media subtrees. The files live under
+        // `media_path` (so the compression worker and export can read them off disk) but
+        // must NOT be pullable straight from `/media/**` — that bypasses the visibility
+        // checks (soft-delete + ban-hide) in the gated handlers. Every legitimate fetch
+        // goes through `/api/v1/upload/{id}/{original,preview,thumbnail}`, which filter
+        // via `find_visible_media`. The more specific nests take precedence over the
+        // `/media` ServeDir below (which, with all three subtrees blocked, now serves
+        // nothing — kept as a backstop).
+        .nest_service(
+            "/media/originals",
+            get(|| async { axum::http::StatusCode::NOT_FOUND }),
+        )
+        .nest_service(
+            "/media/previews",
+            get(|| async { axum::http::StatusCode::NOT_FOUND }),
+        )
+        .nest_service(
+            "/media/thumbnails",
+            get(|| async { axum::http::StatusCode::NOT_FOUND }),
+        )
         .nest_service("/media", media_service)
         .layer(TraceLayer::new_for_http())
         .with_state(state);
 
     let listener = tokio::net::TcpListener::bind(("0.0.0.0", config.app_port)).await?;
     tracing::info!("listening on {}", listener.local_addr()?);
-    axum::serve(listener, router).await?;
+    axum::serve(listener, router)
+        .with_graceful_shutdown(shutdown_signal())
+        .await?;
 
     Ok(())
 }
+
+/// Hard cap on how long we wait for in-flight connections to drain after a shutdown
+/// signal. Uploads (streamed to disk) finish in well under this; the cap exists because
+/// long-lived SSE streams never end on their own and would otherwise keep the graceful
+/// drain — and thus the process — pending until the orchestrator force-kills it.
+const SHUTDOWN_GRACE: std::time::Duration = std::time::Duration::from_secs(10);
+
+/// Resolves on SIGINT (Ctrl-C) or SIGTERM (container stop / deploy). Letting
+/// `axum::serve` drain in-flight requests on this signal means a redeploy no longer
+/// truncates uploads mid-flight; any background compression/export half-states that a
+/// hard kill would leave are already reconciled by `startup_recovery` on the next boot.
+///
+/// Once the signal fires we also arm a detached backstop that force-exits after
+/// [`SHUTDOWN_GRACE`]. Without it, open SSE streams (which have no natural end) would
+/// hold the graceful drain open indefinitely; the backstop bounds shutdown regardless
+/// of the orchestrator's own kill timeout. If the drain completes first, `main` returns
+/// and the process exits before the timer ever fires.
+async fn shutdown_signal() {
+    let ctrl_c = async {
+        let _ = tokio::signal::ctrl_c().await;
+    };
+
+    #[cfg(unix)]
+    let terminate = async {
+        match tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate()) {
+            Ok(mut sig) => {
+                sig.recv().await;
+            }
+            Err(e) => {
+                tracing::warn!(error = ?e, "failed to install SIGTERM handler");
+                // Never resolve — fall back to ctrl_c only.
+                std::future::pending::<()>().await;
+            }
+        }
+    };
+
+    #[cfg(not(unix))]
+    let terminate = std::future::pending::<()>();
+
+    tokio::select! {
+        _ = ctrl_c => {}
+        _ = terminate => {}
+    }
+
+    tracing::info!(
+        "shutdown signal received, draining in-flight requests (max {}s)",
+        SHUTDOWN_GRACE.as_secs()
+    );
+
+    // Backstop: if the graceful drain is still blocked after the grace window (almost
+    // always because SSE streams are still open), exit anyway so deploys aren't stalled.
+    tokio::spawn(async {
+        tokio::time::sleep(SHUTDOWN_GRACE).await;
+        tracing::warn!(
+            "graceful drain exceeded {}s (likely open SSE streams); forcing exit",
+            SHUTDOWN_GRACE.as_secs()
+        );
+        std::process::exit(0);
+    });
+}

backend/src/models/comment.rs

@@ -24,19 +24,24 @@ pub struct CommentDto {
 }
 
 impl Comment {
-    pub async fn create(
-        pool: &PgPool,
+    /// Takes any executor so the caller can insert the comment and link its
+    /// hashtags inside a single transaction.
+    pub async fn create<'e, E>(
+        executor: E,
         upload_id: Uuid,
         user_id: Uuid,
         body: &str,
-    ) -> Result<Self, sqlx::Error> {
+    ) -> Result<Self, sqlx::Error>
+    where
+        E: sqlx::PgExecutor<'e>,
+    {
         sqlx::query_as::<_, Self>(
             "INSERT INTO comment (upload_id, user_id, body) VALUES ($1, $2, $3) RETURNING *",
         )
         .bind(upload_id)
         .bind(user_id)
         .bind(body)
-        .fetch_one(pool)
+        .fetch_one(executor)
         .await
     }
 

backend/src/models/hashtag.rs

@@ -10,7 +10,13 @@ pub struct Hashtag {
 
 impl Hashtag {
     /// Upsert a hashtag (insert if not exists, return existing if it does).
-    pub async fn upsert(pool: &PgPool, event_id: Uuid, tag: &str) -> Result<Self, sqlx::Error> {
+    ///
+    /// Takes any executor so callers can run it inside a transaction (atomic
+    /// upload/comment writes) or standalone against the pool.
+    pub async fn upsert<'e, E>(executor: E, event_id: Uuid, tag: &str) -> Result<Self, sqlx::Error>
+    where
+        E: sqlx::PgExecutor<'e>,
+    {
         let normalized = tag.trim().trim_start_matches('#').to_lowercase();
         sqlx::query_as::<_, Self>(
             "INSERT INTO hashtag (event_id, tag) VALUES ($1, $2)
@@ -19,33 +25,39 @@ impl Hashtag {
         )
         .bind(event_id)
         .bind(&normalized)
-        .fetch_one(pool)
+        .fetch_one(executor)
         .await
     }
 
-    pub async fn link_to_upload(
-        pool: &PgPool,
+    pub async fn link_to_upload<'e, E>(
+        executor: E,
         upload_id: Uuid,
         hashtag_id: Uuid,
-    ) -> Result<(), sqlx::Error> {
+    ) -> Result<(), sqlx::Error>
+    where
+        E: sqlx::PgExecutor<'e>,
+    {
         sqlx::query(
             "INSERT INTO upload_hashtag (upload_id, hashtag_id) VALUES ($1, $2)
              ON CONFLICT DO NOTHING",
         )
         .bind(upload_id)
         .bind(hashtag_id)
-        .execute(pool)
+        .execute(executor)
         .await?;
         Ok(())
     }
 
-    pub async fn unlink_all_from_upload(
-        pool: &PgPool,
+    pub async fn unlink_all_from_upload<'e, E>(
+        executor: E,
         upload_id: Uuid,
-    ) -> Result<(), sqlx::Error> {
+    ) -> Result<(), sqlx::Error>
+    where
+        E: sqlx::PgExecutor<'e>,
+    {
         sqlx::query("DELETE FROM upload_hashtag WHERE upload_id = $1")
             .bind(upload_id)
-            .execute(pool)
+            .execute(executor)
             .await?;
         Ok(())
     }
@@ -109,4 +121,38 @@ mod tests {
     fn empty_or_bare_hash_skipped() {
         assert_eq!(extract_hashtags("# #"), Vec::<String>::new());
     }
+
+    #[test]
+    fn tag_stops_at_first_non_word_char() {
+        // A tag runs until the first char that isn't ascii-alphanumeric or '_'.
+        assert_eq!(extract_hashtags("#foo#bar"), vec!["foo"]);
+        assert_eq!(extract_hashtags("#foo-bar"), vec!["foo"]);
+        assert_eq!(extract_hashtags("##tag"), Vec::<String>::new()); // '#' after the strip is non-word
+    }
+
+    #[test]
+    fn tag_length_is_capped_at_40_chars() {
+        let ok = "a".repeat(40);
+        assert_eq!(extract_hashtags(&format!("#{ok}")), vec![ok.clone()]);
+        // 41+ chars → dropped entirely (not truncated).
+        let too_long = "a".repeat(41);
+        assert_eq!(extract_hashtags(&format!("#{too_long}")), Vec::<String>::new());
+    }
+
+    #[test]
+    fn duplicate_tags_are_returned_verbatim_not_deduplicated() {
+        // Dedup is the DB's job (Hashtag::upsert ON CONFLICT); extraction returns each
+        // occurrence so callers can count/link them independently. Case folds to lower.
+        assert_eq!(extract_hashtags("#fun #Fun #fun!"), vec!["fun", "fun", "fun"]);
+    }
+
+    #[test]
+    fn non_ascii_word_chars_truncate_the_tag() {
+        // KNOWN LIMITATION for a German app: `is_ascii_alphanumeric` excludes umlauts
+        // and ß, so a tag truncates at the first non-ASCII letter. Pinned here so a
+        // future Unicode-aware change is a deliberate, test-visible decision.
+        assert_eq!(extract_hashtags("#Grüße"), vec!["gr"]);
+        assert_eq!(extract_hashtags("#Straße"), vec!["stra"]);
+        assert_eq!(extract_hashtags("#café"), vec!["caf"]);
+    }
 }

backend/src/models/session.rs

@@ -43,11 +43,47 @@ impl Session {
         .await
     }
 
-    pub async fn touch(pool: &PgPool, id: Uuid) -> Result<(), sqlx::Error> {
-        sqlx::query("UPDATE session SET last_seen_at = NOW() WHERE id = $1")
-            .bind(id)
-            .execute(pool)
-            .await?;
+    /// Resolve a session token straight to its live user row in one round-trip.
+    ///
+    /// The auth extractor runs on every authenticated request and used to do two
+    /// sequential queries (session lookup, then user lookup); this collapses them into
+    /// a single `session JOIN "user"`. The `expires_at` guard mirrors
+    /// [`Self::find_by_token_hash`], and the user row is read live (role/ban are never
+    /// trusted from the JWT). Returns `None` when the session is missing/expired.
+    pub async fn find_user_by_token_hash(
+        pool: &PgPool,
+        token_hash: &str,
+    ) -> Result<Option<crate::models::user::User>, sqlx::Error> {
+        sqlx::query_as::<_, crate::models::user::User>(
+            "SELECT u.*
+             FROM session s
+             JOIN \"user\" u ON u.id = s.user_id
+             WHERE s.token_hash = $1 AND s.expires_at > NOW()",
+        )
+        .bind(token_hash)
+        .fetch_optional(pool)
+        .await
+    }
+
+    /// Touch `last_seen_at` AND slide `expires_at` forward by `expiry_days` from now, so
+    /// an actively-used session never hits the fixed 30-day cliff (it renews on every
+    /// authenticated request). An idle session still expires `expiry_days` after its last
+    /// activity. Keyed by token hash so the auth extractor needs no prior id lookup.
+    pub async fn touch_and_renew(
+        pool: &PgPool,
+        token_hash: &str,
+        expiry_days: i64,
+    ) -> Result<(), sqlx::Error> {
+        sqlx::query(
+            "UPDATE session
+             SET last_seen_at = NOW(),
+                 expires_at = NOW() + ($2 || ' days')::interval
+             WHERE token_hash = $1",
+        )
+        .bind(token_hash)
+        .bind(expiry_days.to_string())
+        .execute(pool)
+        .await?;
         Ok(())
     }
 
@@ -61,4 +97,14 @@ impl Session {
             .await?;
         Ok(())
     }
+
+    /// Revoke every session for a user. Backs "sign out everywhere" and the forced
+    /// re-auth after a host PIN-reset or a ban. Returns the number of sessions cleared.
+    pub async fn delete_all_for_user(pool: &PgPool, user_id: Uuid) -> Result<u64, sqlx::Error> {
+        let r = sqlx::query("DELETE FROM session WHERE user_id = $1")
+            .bind(user_id)
+            .execute(pool)
+            .await?;
+        Ok(r.rows_affected())
+    }
 }

backend/src/models/upload.rs

@@ -35,16 +35,31 @@ pub struct UploadDto {
     pub created_at: DateTime<Utc>,
 }
 
+/// Minimal projection of an upload's on-disk file paths, used by the visibility-gated
+/// media aliases so they don't hydrate the entire `Upload` row per request.
+#[derive(Debug, sqlx::FromRow)]
+pub struct VisibleMedia {
+    pub original_path: String,
+    pub preview_path: Option<String>,
+    pub thumbnail_path: Option<String>,
+    pub mime_type: String,
+}
+
 impl Upload {
-    pub async fn create(
-        pool: &PgPool,
+    /// Takes any executor so the caller can run it inside a transaction (atomic
+    /// quota + insert) or standalone against the pool.
+    pub async fn create<'e, E>(
+        executor: E,
         event_id: Uuid,
         user_id: Uuid,
         original_path: &str,
         mime_type: &str,
         original_size_bytes: i64,
         caption: Option<&str>,
-    ) -> Result<Self, sqlx::Error> {
+    ) -> Result<Self, sqlx::Error>
+    where
+        E: sqlx::PgExecutor<'e>,
+    {
         sqlx::query_as::<_, Self>(
             "INSERT INTO upload (event_id, user_id, original_path, mime_type, original_size_bytes, caption)
              VALUES ($1, $2, $3, $4, $5, $6)
@@ -56,7 +71,7 @@ impl Upload {
         .bind(mime_type)
         .bind(original_size_bytes)
         .bind(caption)
-        .fetch_one(pool)
+        .fetch_one(executor)
         .await
     }
 
@@ -69,6 +84,31 @@ impl Upload {
         .await
     }
 
+    /// Lean lookup for the public media aliases (`get_original`/`get_preview`/
+    /// `get_thumbnail`): returns ONLY the file paths + mime for a visible upload —
+    /// excluding soft-deleted rows, hidden owners (`uploads_hidden`), and banned owners
+    /// (`is_banned`) — the same filter `v_feed` applies. So moderation that removes a post
+    /// from the feed also stops its original/preview/thumbnail from being pulled by UUID.
+    ///
+    /// Selects four columns instead of the whole `Upload` row: this runs once per image
+    /// per cache-miss on the media hot path, so we avoid hydrating fields the response
+    /// never uses.
+    pub async fn find_visible_media(
+        pool: &PgPool,
+        id: Uuid,
+    ) -> Result<Option<VisibleMedia>, sqlx::Error> {
+        sqlx::query_as::<_, VisibleMedia>(
+            "SELECT up.original_path, up.preview_path, up.thumbnail_path, up.mime_type
+             FROM upload up
+             JOIN \"user\" u ON u.id = up.user_id
+             WHERE up.id = $1 AND up.deleted_at IS NULL
+               AND u.uploads_hidden = false AND u.is_banned = false",
+        )
+        .bind(id)
+        .fetch_optional(pool)
+        .await
+    }
+
     /// Event-scoped lookup used by host endpoints so a host of event A cannot
     /// reach uploads belonging to event B.
     pub async fn find_by_id_and_event(
@@ -182,15 +222,18 @@ impl Upload {
         Ok(deleted)
     }
 
-    pub async fn update_caption(
-        pool: &PgPool,
+    pub async fn update_caption<'e, E>(
+        executor: E,
         id: Uuid,
         caption: Option<&str>,
-    ) -> Result<(), sqlx::Error> {
+    ) -> Result<(), sqlx::Error>
+    where
+        E: sqlx::PgExecutor<'e>,
+    {
         sqlx::query("UPDATE upload SET caption = $2 WHERE id = $1")
             .bind(id)
             .bind(caption)
-            .execute(pool)
+            .execute(executor)
             .await?;
         Ok(())
     }

backend/src/services/compression.rs

@@ -42,11 +42,28 @@ impl CompressionWorker {
                 }
                 Err(e) => {
                     tracing::error!("compression failed for upload {upload_id}: {e:#}");
+                    // Auto-cleanup: a failed transcode would otherwise leave a
+                    // permanently broken feed card, silently charge the uploader's
+                    // quota, and orphan the original on disk. Refund + soft-delete
+                    // (one tx, so v_feed excludes it), remove the orphan file, then
+                    // tell the uploader (upload-error toast) and evict the card
+                    // everywhere (upload-deleted, already handled by the feed).
+                    let _ = Upload::set_compression_status(&worker.pool, upload_id, "failed").await;
+                    if let Err(del) = Upload::soft_delete(&worker.pool, upload_id).await {
+                        tracing::warn!(error = ?del, %upload_id, "failed to soft-delete after compression failure");
+                    }
+                    let orphan = worker.media_path.join(&original_path);
+                    if let Err(rm) = tokio::fs::remove_file(&orphan).await {
+                        tracing::warn!(error = ?rm, path = %orphan.display(), "failed to remove orphaned original");
+                    }
                     let _ = worker.sse_tx.send(SseEvent {
                         event_type: "upload-error".to_string(),
                         data: serde_json::json!({ "upload_id": upload_id, "error": e.to_string() }).to_string(),
                     });
-                    let _ = Upload::set_compression_status(&worker.pool, upload_id, "failed").await;
+                    let _ = worker.sse_tx.send(SseEvent {
+                        event_type: "upload-deleted".to_string(),
+                        data: serde_json::json!({ "upload_id": upload_id }).to_string(),
+                    });
                 }
             }
         });
@@ -93,8 +110,21 @@ impl CompressionWorker {
 
         // Run blocking image operations in a spawn_blocking task
         tokio::task::spawn_blocking(move || -> Result<()> {
-            let img = image::open(&original)
-                .context("failed to open image")?;
+            // Reject decompression bombs *before* fully decoding: the upload body
+            // cap bounds the file size on disk, but a small file can still decode to
+            // enormous dimensions (e.g. a ~1 MB image expanding to 50k×50k px →
+            // gigabytes), OOM-ing the box during decode/resize. 12000×12000 covers
+            // any real phone photo; max_alloc hard-caps the decode allocation.
+            let mut reader = image::ImageReader::open(&original)
+                .context("failed to open image")?
+                .with_guessed_format()
+                .context("failed to read image header")?;
+            let mut limits = image::Limits::default();
+            limits.max_image_width = Some(12_000);
+            limits.max_image_height = Some(12_000);
+            limits.max_alloc = Some(256 * 1024 * 1024);
+            reader.limits(limits);
+            let img = reader.decode().context("failed to decode image")?;
 
             // Resize to max 800px wide, preserving aspect ratio
             let preview = img.resize(800, 800, image::imageops::FilterType::Lanczos3);

backend/src/services/config.rs

@@ -1,46 +1,129 @@
-//! Reads of the runtime-tunable `config` table.
+//! Reads of the runtime-tunable `config` table, fronted by an in-memory cache.
 //!
 //! Each handler used to keep a small local copy of these helpers; consolidating them
 //! here means one place to add a parser, one place to mock for tests, and one place to
 //! find when a key changes. New keys do not require code changes — they're picked up
-//! the next time someone calls `get_*`.
+//! the next time the cache reloads.
+//!
+//! ## Why a cache
+//!
+//! The `config` table is effectively static during an event, yet it was the busiest
+//! query in the system: every request re-read each key with its own `SELECT`
+//! (an upload touched it ~8 times). Against the small connection pool that was the
+//! throughput ceiling. [`ConfigCache`] loads the whole table once and serves reads
+//! from memory.
+//!
+//! ## Consistency contract
+//!
+//! Correctness comes from **synchronous invalidation on every write**, not from the
+//! TTL. The two runtime write paths — the admin `PATCH /admin/config` handler and the
+//! test-mode truncate/reseed — both call [`ConfigCache::invalidate`] after committing,
+//! so the *next* read reloads from the DB and sees the new value immediately. The
+//! [`RELOAD_TTL`] is only a safety net for out-of-band changes (e.g. a migration or a
+//! manual DB edit); it is deliberately short but never the primary mechanism.
 //!
 //! Values are read with a default fallback so the app still starts if a key is missing
 //! (e.g. during a migration window). Production seeds keys via migrations 005 and 009.
 
+use std::collections::HashMap;
+use std::sync::{Arc, RwLock};
+use std::time::{Duration, Instant};
+
 use sqlx::PgPool;
 
-async fn fetch_raw(pool: &PgPool, key: &str) -> Option<String> {
-    sqlx::query_as::<_, (String,)>("SELECT value FROM config WHERE key = $1")
-        .bind(key)
-        .fetch_optional(pool)
-        .await
-        .ok()
-        .flatten()
-        .map(|(v,)| v)
+/// How long a loaded snapshot is trusted before the next read reloads it. This is a
+/// backstop for out-of-band DB changes only — every in-process write invalidates the
+/// cache synchronously, so tests that PATCH-then-assert never depend on this expiring.
+const RELOAD_TTL: Duration = Duration::from_secs(30);
+
+struct Snapshot {
+    values: HashMap<String, String>,
+    loaded_at: Instant,
 }
 
-pub async fn get_str(pool: &PgPool, key: &str, default: &str) -> String {
-    fetch_raw(pool, key).await.unwrap_or_else(|| default.to_string())
+/// In-memory cache of the entire `config` table. Cheap to `clone` (shares the pool and
+/// the `Arc`), so it lives in `AppState` and every handler reads through it.
+#[derive(Clone)]
+pub struct ConfigCache {
+    pool: PgPool,
+    inner: Arc<RwLock<Option<Snapshot>>>,
 }
 
-pub async fn get_i64(pool: &PgPool, key: &str, default: i64) -> i64 {
-    fetch_raw(pool, key).await.and_then(|v| v.parse().ok()).unwrap_or(default)
+impl ConfigCache {
+    pub fn new(pool: PgPool) -> Self {
+        Self {
+            pool,
+            inner: Arc::new(RwLock::new(None)),
+        }
+    }
+
+    /// Drop the cached snapshot so the next read reloads the whole table from the DB.
+    /// Call this after any write to the `config` table (admin PATCH, test reseed).
+    pub fn invalidate(&self) {
+        *self.inner.write().unwrap() = None;
+    }
+
+    /// Return the fresh snapshot if one is loaded and still within [`RELOAD_TTL`].
+    fn fresh_snapshot(&self) -> Option<HashMap<String, String>> {
+        let guard = self.inner.read().unwrap();
+        match guard.as_ref() {
+            Some(snap) if snap.loaded_at.elapsed() < RELOAD_TTL => Some(snap.values.clone()),
+            _ => None,
+        }
+    }
+
+    /// Read one key, loading the whole table into the cache on a miss/expiry. On a DB
+    /// error we return `None` (callers fall back to their default) without poisoning
+    /// the cache.
+    async fn get_raw(&self, key: &str) -> Option<String> {
+        if let Some(values) = self.fresh_snapshot() {
+            return values.get(key).cloned();
+        }
+
+        // Cache miss or stale — reload the entire table in one query.
+        let rows: Vec<(String, String)> =
+            match sqlx::query_as::<_, (String, String)>("SELECT key, value FROM config")
+                .fetch_all(&self.pool)
+                .await
+            {
+                Ok(rows) => rows,
+                Err(e) => {
+                    tracing::warn!(error = ?e, "config reload failed; using defaults for this read");
+                    return None;
+                }
+            };
+
+        let values: HashMap<String, String> = rows.into_iter().collect();
+        let result = values.get(key).cloned();
+        *self.inner.write().unwrap() = Some(Snapshot {
+            values,
+            loaded_at: Instant::now(),
+        });
+        result
+    }
 }
 
-pub async fn get_usize(pool: &PgPool, key: &str, default: usize) -> usize {
-    fetch_raw(pool, key).await.and_then(|v| v.parse().ok()).unwrap_or(default)
+pub async fn get_str(cache: &ConfigCache, key: &str, default: &str) -> String {
+    cache.get_raw(key).await.unwrap_or_else(|| default.to_string())
 }
 
-pub async fn get_f64(pool: &PgPool, key: &str, default: f64) -> f64 {
-    fetch_raw(pool, key).await.and_then(|v| v.parse().ok()).unwrap_or(default)
+pub async fn get_i64(cache: &ConfigCache, key: &str, default: i64) -> i64 {
+    cache.get_raw(key).await.and_then(|v| v.parse().ok()).unwrap_or(default)
+}
+
+pub async fn get_usize(cache: &ConfigCache, key: &str, default: usize) -> usize {
+    cache.get_raw(key).await.and_then(|v| v.parse().ok()).unwrap_or(default)
+}
+
+pub async fn get_f64(cache: &ConfigCache, key: &str, default: f64) -> f64 {
+    cache.get_raw(key).await.and_then(|v| v.parse().ok()).unwrap_or(default)
 }
 
 /// Parses common truthy spellings used by both the migration seeds and the admin form.
 /// Accepts `true/false`, `1/0`, `yes/no`, `on/off` — case-insensitive. Anything else
 /// returns `default`.
-pub async fn get_bool(pool: &PgPool, key: &str, default: bool) -> bool {
-    let Some(raw) = fetch_raw(pool, key).await else { return default };
+pub async fn get_bool(cache: &ConfigCache, key: &str, default: bool) -> bool {
+    let Some(raw) = cache.get_raw(key).await else { return default };
     match raw.trim().to_ascii_lowercase().as_str() {
         "true" | "1" | "yes" | "on" => true,
         "false" | "0" | "no" | "off" => false,

backend/src/services/disk.rs

@@ -0,0 +1,145 @@
+//! Cached view of the filesystem backing the media directory.
+//!
+//! Free/total disk space is needed on two hot paths — the per-user storage quota
+//! (checked on every upload *and* every `GET /me/quota` poll) and the admin stats
+//! endpoint. Reading it means `sysinfo::Disks::new_with_refreshed_list()`, which stats
+//! every mounted filesystem; doing that per request is wasteful for a number that
+//! barely moves. [`DiskCache`] refreshes it at most once per [`TTL`] and serves the
+//! rest from memory.
+
+use std::path::Path;
+use std::sync::{Arc, RwLock};
+use std::time::{Duration, Instant};
+
+/// How long a disk reading is trusted before the next call re-stats the filesystem.
+const TTL: Duration = Duration::from_secs(15);
+
+#[derive(Clone, Copy)]
+pub struct DiskInfo {
+    pub total: u64,
+    pub free: u64,
+}
+
+/// Cheap-to-clone cache of the media filesystem's total/free bytes. Lives in
+/// `AppState`.
+#[derive(Clone)]
+pub struct DiskCache {
+    inner: Arc<RwLock<Option<(DiskInfo, Instant)>>>,
+}
+
+impl DiskCache {
+    pub fn new() -> Self {
+        Self {
+            inner: Arc::new(RwLock::new(None)),
+        }
+    }
+
+    /// Cached `(total, free)` bytes for the filesystem that holds `media_path`.
+    ///
+    /// Returns `None` when the mount can't be resolved — callers MUST treat that as
+    /// "unknown", never "zero free". (The quota path in particular fails *open* on
+    /// `None`: enforcing a 0-byte limit would lock every user out of uploading.)
+    pub fn snapshot(&self, media_path: &Path) -> Option<DiskInfo> {
+        if let Some((info, at)) = *self.inner.read().unwrap() {
+            if at.elapsed() < TTL {
+                return Some(info);
+            }
+        }
+        let info = read_disk_for_path(media_path)?;
+        *self.inner.write().unwrap() = Some((info, Instant::now()));
+        Some(info)
+    }
+}
+
+impl Default for DiskCache {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Resolve the filesystem backing `media_path` and read its total/free bytes.
+///
+/// Snapshots the mount table via `sysinfo`, then delegates the selection to the pure
+/// [`select_disk`] so the (fiddly, edge-case-prone) matching logic is unit-testable
+/// without touching the real filesystem.
+fn read_disk_for_path(media_path: &Path) -> Option<DiskInfo> {
+    let disks = sysinfo::Disks::new_with_refreshed_list();
+    let mounts: Vec<(String, u64, u64)> = disks
+        .iter()
+        .map(|d| {
+            (
+                d.mount_point().to_string_lossy().to_string(),
+                d.total_space(),
+                d.available_space(),
+            )
+        })
+        .collect();
+    select_disk(&mounts, &media_path.to_string_lossy())
+}
+
+/// Pick the filesystem for `media_path` from a `(mount_point, total, free)` table.
+///
+/// Chooses the **longest** mount point that is a prefix of `media_path` (the most
+/// specific filesystem) rather than the first match — otherwise the root `/` mount,
+/// which prefixes every absolute path, could shadow a dedicated `/media` volume. Falls
+/// back to `/` when nothing prefixes the path (e.g. a relative media path), and to
+/// `None` when even that is absent — the caller treats `None` as "unknown" and fails
+/// open on quota.
+fn select_disk(mounts: &[(String, u64, u64)], media_path: &str) -> Option<DiskInfo> {
+    mounts
+        .iter()
+        .filter(|(mp, _, _)| media_path.starts_with(mp.as_str()))
+        .max_by_key(|(mp, _, _)| mp.len())
+        .or_else(|| mounts.iter().find(|(mp, _, _)| mp == "/"))
+        .map(|(_, total, free)| DiskInfo {
+            total: *total,
+            free: *free,
+        })
+}
+
+#[cfg(test)]
+mod tests {
+    use super::select_disk;
+
+    #[test]
+    fn picks_longest_matching_mount() {
+        // Both "/" and "/media" prefix the path; the dedicated volume must win.
+        let mounts = vec![
+            ("/".to_string(), 100, 40),
+            ("/media".to_string(), 200, 150),
+        ];
+        let d = select_disk(&mounts, "/media/originals/x.jpg").unwrap();
+        assert_eq!((d.total, d.free), (200, 150));
+    }
+
+    #[test]
+    fn falls_back_to_root_when_no_specific_mount_matches() {
+        let mounts = vec![
+            ("/".to_string(), 100, 40),
+            ("/media".to_string(), 200, 150),
+        ];
+        // "/var/lib" is only prefixed by "/".
+        let d = select_disk(&mounts, "/var/lib/data").unwrap();
+        assert_eq!((d.total, d.free), (100, 40));
+    }
+
+    #[test]
+    fn relative_path_uses_root_fallback() {
+        let mounts = vec![("/".to_string(), 100, 40)];
+        // A relative path prefixes nothing, so the explicit "/" fallback applies.
+        let d = select_disk(&mounts, "media/originals").unwrap();
+        assert_eq!((d.total, d.free), (100, 40));
+    }
+
+    #[test]
+    fn none_when_no_mount_matches_and_no_root() {
+        // No "/" present and nothing prefixes the relative path → unknown (fail-open).
+        let mounts = vec![("/data".to_string(), 100, 40)];
+        assert!(select_disk(&mounts, "relative/path").is_none());
+    }
+
+    #[test]
+    fn none_on_empty_mount_table() {
+        assert!(select_disk(&[], "/media/x").is_none());
+    }
+}

backend/src/services/export.rs

@@ -82,20 +82,107 @@ struct ViewerMedia {
 
 // ── Entry point ──────────────────────────────────────────────────────────────
 
+/// (Re)enqueue the export jobs for an event and spawn the workers. Safe to call on a
+/// fresh release *and* on a re-release: the `export_job` rows are reset to a clean
+/// `pending` state (clearing any prior `failed`/`done` from an earlier run) and the
+/// event's `export_*_ready` flags are cleared so downloads reflect the regenerating
+/// export rather than the stale one. This is the single path used by `release_gallery`
+/// and by startup export recovery, so the two can't drift.
+pub async fn enqueue_and_spawn_exports(
+    event_id: Uuid,
+    event_name: String,
+    pool: PgPool,
+    media_path: PathBuf,
+    export_path: PathBuf,
+    sse_tx: broadcast::Sender<SseEvent>,
+) -> Result<()> {
+    for export_type in ["zip", "html"] {
+        // Reset a prior 'done'/'failed' row to 'pending' so this (re)release regenerates —
+        // but DO NOT touch a row that's still 'running'. If a worker from an earlier
+        // release is mid-export, leaving it 'running' makes the worker we spawn below bail
+        // its claim (WHERE status='pending' → 0 rows), so the two never race the temp file.
+        sqlx::query(
+            "INSERT INTO export_job (event_id, type, status, progress_pct)
+             VALUES ($1, $2::export_type, 'pending', 0)
+             ON CONFLICT (event_id, type) DO UPDATE
+                 SET status = 'pending', progress_pct = 0, file_path = NULL,
+                     error_message = NULL, completed_at = NULL
+                 WHERE export_job.status <> 'running'",
+        )
+        .bind(event_id)
+        .bind(export_type)
+        .execute(&pool)
+        .await?;
+    }
+    // Clear readiness so /export downloads 404 until the fresh run completes, instead of
+    // serving a stale keepsake that predates a reopen→re-release.
+    sqlx::query("UPDATE event SET export_zip_ready = FALSE, export_html_ready = FALSE WHERE id = $1")
+        .bind(event_id)
+        .execute(&pool)
+        .await?;
+
+    spawn_export_jobs(event_id, event_name, pool, media_path, export_path, sse_tx);
+    Ok(())
+}
+
+/// Startup export recovery: re-spawn exports for any released event whose keepsake is
+/// not fully ready (a crash mid-export left `export_released_at` set but the ZIP/HTML
+/// jobs `failed`). Without this, `release_gallery` would reject a retry with "bereits
+/// freigegeben" and downloads would 404 forever. Runs once at boot, after `AppState`
+/// exists (it needs the media/export paths + SSE sender).
+pub async fn recover_exports(
+    pool: PgPool,
+    media_path: PathBuf,
+    export_path: PathBuf,
+    sse_tx: broadcast::Sender<SseEvent>,
+) {
+    let rows = match sqlx::query_as::<_, (Uuid, String)>(
+        "SELECT id, name FROM event
+         WHERE export_released_at IS NOT NULL
+           AND NOT (export_zip_ready AND export_html_ready)",
+    )
+    .fetch_all(&pool)
+    .await
+    {
+        Ok(r) => r,
+        Err(e) => {
+            tracing::error!("export recovery: failed to query released events: {e:#}");
+            return;
+        }
+    };
+    for (event_id, event_name) in rows {
+        tracing::warn!("export recovery: re-spawning export jobs for event {event_id}");
+        if let Err(e) = enqueue_and_spawn_exports(
+            event_id,
+            event_name,
+            pool.clone(),
+            media_path.clone(),
+            export_path.clone(),
+            sse_tx.clone(),
+        )
+        .await
+        {
+            tracing::error!("export recovery: failed to re-spawn for event {event_id}: {e:#}");
+        }
+    }
+}
+
 pub fn spawn_export_jobs(
     event_id: Uuid,
     event_name: String,
     pool: PgPool,
     media_path: PathBuf,
+    export_path: PathBuf,
     sse_tx: broadcast::Sender<SseEvent>,
 ) {
     let pool2 = pool.clone();
     let media_path2 = media_path.clone();
+    let export_path2 = export_path.clone();
     let sse_tx2 = sse_tx.clone();
     let event_name2 = event_name.clone();
 
     tokio::spawn(async move {
-        if let Err(e) = run_zip_export(event_id, &pool, &media_path, &sse_tx).await {
+        if let Err(e) = run_zip_export(event_id, &pool, &media_path, &export_path, &sse_tx).await {
             tracing::error!("ZIP export failed for event {event_id}: {e:#}");
             mark_failed(&pool, event_id, "zip", &e.to_string()).await;
         }
@@ -104,7 +191,7 @@ pub fn spawn_export_jobs(
 
     tokio::spawn(async move {
         if let Err(e) =
-            run_html_export(event_id, &event_name2, &pool2, &media_path2, &sse_tx2).await
+            run_html_export(event_id, &event_name2, &pool2, &media_path2, &export_path2, &sse_tx2).await
         {
             tracing::error!("HTML export failed for event {event_id}: {e:#}");
             mark_failed(&pool2, event_id, "html", &e.to_string()).await;
@@ -119,14 +206,19 @@ async fn run_zip_export(
     event_id: Uuid,
     pool: &PgPool,
     media_path: &Path,
+    export_path: &Path,
     sse_tx: &broadcast::Sender<SseEvent>,
 ) -> Result<()> {
-    mark_running(pool, event_id, "zip").await;
+    if !claim_job(pool, event_id, "zip").await {
+        // Another worker already owns this ZIP export — bail rather than race the temp file.
+        return Ok(());
+    }
 
     let uploads = query_uploads(pool, event_id).await?;
     let total = uploads.len().max(1) as f32;
 
-    let exports_dir = media_path.join("exports");
+    // Written OUTSIDE media_path: the public /media ServeDir must never reach these.
+    let exports_dir = export_path.to_path_buf();
     tokio::fs::create_dir_all(&exports_dir).await?;
 
     let tmp_path = exports_dir.join("Gallery.zip.tmp");
@@ -188,14 +280,35 @@ async fn run_zip_export(
 
 // ── HTML viewer export ──────────────────────────────────────────────────────
 
+/// Where a media entry's bytes come from at ZIP-writing time. Derived variants
+/// (thumbnails, compressed images) are staged under the temp dir; original-fidelity
+/// variants (videos, small images) are streamed straight from the source on disk so
+/// the export never transiently doubles disk usage by copying large files to temp.
+enum MediaSource {
+    Temp(PathBuf),
+    Original(PathBuf),
+}
+
+impl MediaSource {
+    fn path(&self) -> &Path {
+        match self {
+            MediaSource::Temp(p) | MediaSource::Original(p) => p,
+        }
+    }
+}
+
 async fn run_html_export(
     event_id: Uuid,
     event_name: &str,
     pool: &PgPool,
     media_path: &Path,
+    export_path: &Path,
     sse_tx: &broadcast::Sender<SseEvent>,
 ) -> Result<()> {
-    mark_running(pool, event_id, "html").await;
+    if !claim_job(pool, event_id, "html").await {
+        // Another worker already owns this HTML export — bail rather than race the temp dir.
+        return Ok(());
+    }
 
     // 1. Query data
     let uploads = query_uploads(pool, event_id).await?;
@@ -205,7 +318,8 @@ async fn run_html_export(
 
     update_progress(pool, event_id, "html", 5).await;
 
-    let exports_dir = media_path.join("exports");
+    // Written OUTSIDE media_path: the public /media ServeDir must never reach these.
+    let exports_dir = export_path.to_path_buf();
     tokio::fs::create_dir_all(&exports_dir).await?;
 
     // 2. Create temp directory for media processing
@@ -215,6 +329,9 @@ async fn run_html_export(
 
     // 3. Process media and build post data
     let mut viewer_posts: Vec<ViewerPost> = Vec::new();
+    // (zip entry name under media/, where its bytes come from). Built here, streamed
+    // into the ZIP in step 5 — so we also know the exact file count without a rescan.
+    let mut media_manifest: Vec<(String, MediaSource)> = Vec::new();
 
     for (i, row) in uploads.iter().enumerate() {
         let src = media_path.join(&row.original_path);
@@ -225,8 +342,10 @@ async fn run_html_export(
         let is_video = row.mime_type.starts_with("video/");
         let id_str = row.id.to_string();
 
-        // Generate thumbnail and full variant
-        let (thumb_name, full_name) = if is_video {
+        // Generate thumbnail and full variant. `full_source` says where the full-res
+        // bytes come from at ZIP time — for videos and small images that's the original
+        // on disk (streamed directly, never copied to temp).
+        let (thumb_name, full_name, full_source) = if is_video {
             let thumb = format!("{id_str}_thumb.jpg");
             let full_ext = ext_from_path(&row.original_path);
             let full = format!("{id_str}.{full_ext}");
@@ -253,14 +372,13 @@ async fn run_html_export(
                 Ok(output) if output.status.success() => {}
                 _ => {
                     tracing::warn!("ffmpeg thumbnail failed for upload {}, skipping thumb", row.id);
-                    // Create empty thumb entry — viewer handles missing thumbs gracefully
+                    // Missing thumb entry — viewer handles missing thumbs gracefully.
                 }
             }
 
-            // Copy video as-is
-            tokio::fs::copy(&src, media_tmp.join(&full)).await?;
-
-            (thumb, full)
+            // Stream the video full-res straight from the original at ZIP time — no
+            // copy to temp (that used to transiently double disk usage per video).
+            (thumb, full, MediaSource::Original(src.clone()))
         } else {
             let thumb = format!("{id_str}_thumb.jpg");
             let ext = ext_from_path(&row.original_path);
@@ -285,13 +403,12 @@ async fn run_html_export(
                 tracing::warn!("thumbnail generation failed for upload {}: {e:#}", row.id);
             }
 
-            // Full variant: compress if >5MB, otherwise copy original
+            // Full variant: compress to temp if >5MB, otherwise stream the original
+            // as-is (no temp copy).
             let src_meta = tokio::fs::metadata(&src).await?;
-            let full_path = media_tmp.join(&full);
-
-            if src_meta.len() > 5_000_000 {
-                // Resize to max 2000px
+            let full_source = if src_meta.len() > 5_000_000 {
                 let src_clone = src.clone();
+                let full_path = media_tmp.join(&full);
                 let full_path_clone = full_path.clone();
 
                 let compress_result = tokio::task::spawn_blocking(move || -> Result<()> {
@@ -305,17 +422,31 @@ async fn run_html_export(
                 })
                 .await?;
 
-                if let Err(e) = compress_result {
-                    tracing::warn!("compression failed for upload {}, copying original: {e:#}", row.id);
-                    tokio::fs::copy(&src, &full_path).await?;
+                match compress_result {
+                    Ok(()) => MediaSource::Temp(full_path),
+                    Err(e) => {
+                        tracing::warn!(
+                            "compression failed for upload {}, using original: {e:#}",
+                            row.id
+                        );
+                        MediaSource::Original(src.clone())
+                    }
                 }
             } else {
-                tokio::fs::copy(&src, &full_path).await?;
-            }
+                MediaSource::Original(src.clone())
+            };
 
-            (thumb, full)
+            (thumb, full, full_source)
         };
 
+        // Register this post's two media entries. Thumbnails always come from temp
+        // (they're freshly generated); the full variant's source was decided above.
+        media_manifest.push((
+            thumb_name.clone(),
+            MediaSource::Temp(media_tmp.join(&thumb_name)),
+        ));
+        media_manifest.push((full_name.clone(), full_source));
+
         // Build comments for this upload
         let post_comments: Vec<ViewerComment> = comments
             .iter()
@@ -403,27 +534,23 @@ async fn run_html_export(
 
         update_progress(pool, event_id, "html", 78).await;
 
-        // Write media files from temp directory
-        let mut media_entries = tokio::fs::read_dir(&media_tmp).await?;
-        let mut file_count = 0u32;
+        // Write media files from the manifest built in step 3. Thumbnails and derived
+        // image variants stream from temp; video and small-image full variants stream
+        // straight from the original on disk. Sources that don't exist (e.g. a thumb
+        // whose ffmpeg step failed) are skipped — the viewer tolerates gaps.
+        let file_total = media_manifest.len().max(1) as f32;
         let mut files_written = 0u32;
 
-        // Count files first
-        {
-            let mut counter = tokio::fs::read_dir(&media_tmp).await?;
-            while counter.next_entry().await?.is_some() {
-                file_count += 1;
+        for (name, source) in &media_manifest {
+            let path = source.path();
+            if !path.exists() {
+                continue;
             }
-        }
-        let file_total = file_count.max(1) as f32;
-
-        while let Some(dir_entry) = media_entries.next_entry().await? {
-            let filename = dir_entry.file_name();
-            let entry_name = format!("media/{}", filename.to_string_lossy());
 
+            let entry_name = format!("media/{name}");
             let builder = ZipEntryBuilder::new(entry_name.into(), Compression::Stored);
             let mut zip_entry = zip.write_entry_stream(builder).await?;
-            let mut f = tokio::fs::File::open(dir_entry.path()).await?.compat();
+            let mut f = tokio::fs::File::open(path).await?.compat();
             fcopy(&mut f, &mut zip_entry).await?;
             zip_entry.close().await?;
 
@@ -475,7 +602,8 @@ async fn query_uploads(pool: &PgPool, event_id: Uuid) -> Result<Vec<ExportUpload
          FROM upload u
          JOIN \"user\" usr ON usr.id = u.user_id
          LEFT JOIN \"like\" l ON l.upload_id = u.id
-         WHERE u.event_id = $1 AND u.deleted_at IS NULL AND usr.uploads_hidden = FALSE
+         WHERE u.event_id = $1 AND u.deleted_at IS NULL
+           AND usr.uploads_hidden = FALSE AND usr.is_banned = FALSE
          GROUP BY u.id, usr.display_name
          ORDER BY u.created_at ASC",
     )
@@ -512,14 +640,24 @@ async fn query_hashtags(pool: &PgPool, event_id: Uuid) -> Result<Vec<(Uuid, Stri
     Ok(rows)
 }
 
-async fn mark_running(pool: &PgPool, event_id: Uuid, export_type: &str) {
-    let _ = sqlx::query(
-        "UPDATE export_job SET status = 'running' WHERE event_id = $1 AND type = $2::export_type",
+/// Atomically claim a pending export job for this worker. Returns `true` only if we won
+/// (status flipped `pending`→`running` in one statement). Returns `false` when another
+/// worker already owns it — e.g. a reopen→re-release spawned a second worker while a run
+/// from the first release is still in flight. Both write the SAME fixed temp path
+/// (`Gallery.zip.tmp` / `viewer_tmp_*`), so a loser MUST NOT run or it would interleave
+/// bytes and corrupt the archive. The row-level lock serializes the two UPDATEs, so
+/// exactly one sees `status = 'pending'`.
+async fn claim_job(pool: &PgPool, event_id: Uuid, export_type: &str) -> bool {
+    sqlx::query(
+        "UPDATE export_job SET status = 'running'
+         WHERE event_id = $1 AND type = $2::export_type AND status = 'pending'",
     )
     .bind(event_id)
     .bind(export_type)
     .execute(pool)
-    .await;
+    .await
+    .map(|r| r.rows_affected() > 0)
+    .unwrap_or(false)
 }
 
 async fn mark_failed(pool: &PgPool, event_id: Uuid, export_type: &str, msg: &str) {

backend/src/services/maintenance.rs

@@ -44,8 +44,11 @@ pub async fn startup_recovery(pool: &PgPool) {
         Err(e) => tracing::error!("startup recovery: failed to sweep uploads: {e:#}"),
     }
 
-    // Export jobs interrupted mid-run. Mark 'failed' so the host can re-trigger.
-    // The `UNIQUE(event_id, type)` constraint would otherwise block re-release.
+    // Export jobs interrupted mid-run are marked 'failed' here so they aren't left
+    // 'running' forever. The host CANNOT re-trigger a released export (release_gallery
+    // rejects an already-released event), so `export::recover_exports` re-spawns these
+    // failed-but-released jobs from `main` once `AppState` exists (it needs the media
+    // paths + SSE sender this fn doesn't have).
     match sqlx::query(
         "UPDATE export_job
          SET status = 'failed',

backend/src/services/mod.rs

@@ -1,5 +1,6 @@
 pub mod compression;
 pub mod config;
+pub mod disk;
 pub mod export;
 pub mod jobs;
 pub mod maintenance;

backend/src/services/rate_limiter.rs

@@ -71,13 +71,110 @@ impl RateLimiter {
     }
 }
 
-/// Extract the client IP from X-Forwarded-For (Caddy sets this) or fall back
-/// to a provided socket address string.
+/// Extract the client IP from X-Forwarded-For or fall back to a provided socket
+/// address string.
+///
+/// We take the **right-most** entry, not the left-most. Caddy is the sole ingress
+/// and the app port is only `expose`d (never published), so the last hop Caddy
+/// appends is the real client. A client can prepend arbitrary spoofed values to
+/// the left of XFF to dodge throttles — those are ignored here. This assumes
+/// exactly one trusted proxy (Caddy); revisit if that changes.
 pub fn client_ip(headers: &axum::http::HeaderMap, fallback: &str) -> String {
     headers
         .get("x-forwarded-for")
         .and_then(|v| v.to_str().ok())
-        .and_then(|s| s.split(',').next())
+        .and_then(|s| s.rsplit(',').next())
         .map(|s| s.trim().to_owned())
+        .filter(|s| !s.is_empty())
         .unwrap_or_else(|| fallback.to_owned())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use axum::http::HeaderMap;
+
+    const MIN: Duration = Duration::from_secs(60);
+
+    #[test]
+    fn allows_up_to_max_then_blocks() {
+        let rl = RateLimiter::new();
+        assert!(rl.check("k", 3, MIN));
+        assert!(rl.check("k", 3, MIN));
+        assert!(rl.check("k", 3, MIN));
+        assert!(!rl.check("k", 3, MIN), "the 4th request must be blocked");
+    }
+
+    #[test]
+    fn keys_are_independent() {
+        let rl = RateLimiter::new();
+        assert!(rl.check("a", 1, MIN));
+        assert!(!rl.check("a", 1, MIN));
+        assert!(rl.check("b", 1, MIN), "a different key has its own window");
+    }
+
+    #[test]
+    fn window_slides_and_allows_again_after_expiry() {
+        let rl = RateLimiter::new();
+        let w = Duration::from_millis(40);
+        assert!(rl.check("k", 1, w));
+        assert!(!rl.check("k", 1, w));
+        std::thread::sleep(Duration::from_millis(55));
+        assert!(rl.check("k", 1, w), "the slot should expire once the window passes");
+    }
+
+    #[test]
+    fn retry_after_is_between_one_and_window() {
+        let rl = RateLimiter::new();
+        assert!(rl.check_with_retry("k", 1, MIN).is_ok());
+        let retry = rl.check_with_retry("k", 1, MIN).unwrap_err();
+        assert!((1..=60).contains(&retry), "retry_after {retry} out of range");
+    }
+
+    #[test]
+    fn clear_resets_every_window() {
+        let rl = RateLimiter::new();
+        assert!(rl.check("k", 1, MIN));
+        assert!(!rl.check("k", 1, MIN));
+        rl.clear();
+        assert!(rl.check("k", 1, MIN), "clear() must free the window");
+    }
+
+    #[test]
+    fn client_ip_takes_rightmost_forwarded_for_entry() {
+        // The right-most entry is the hop our trusted proxy (Caddy) appended.
+        let mut h = HeaderMap::new();
+        h.insert("x-forwarded-for", "10.0.0.1, 203.0.113.7".parse().unwrap());
+        assert_eq!(client_ip(&h, "fallback"), "203.0.113.7");
+    }
+
+    #[test]
+    fn client_ip_ignores_spoofed_leftmost_entry() {
+        // A client prepending a fake IP to dodge throttles must not win.
+        let mut h = HeaderMap::new();
+        h.insert("x-forwarded-for", "1.2.3.4, 9.9.9.9, 203.0.113.7".parse().unwrap());
+        assert_eq!(client_ip(&h, "fallback"), "203.0.113.7");
+    }
+
+    #[test]
+    fn client_ip_trims_surrounding_whitespace() {
+        let mut h = HeaderMap::new();
+        h.insert("x-forwarded-for", "  198.51.100.5  ".parse().unwrap());
+        assert_eq!(client_ip(&h, "fb"), "198.51.100.5");
+    }
+
+    #[test]
+    fn client_ip_falls_back_when_header_absent() {
+        assert_eq!(client_ip(&HeaderMap::new(), "127.0.0.1"), "127.0.0.1");
+    }
+
+    #[test]
+    fn client_ip_falls_back_on_trailing_comma_empty_entry() {
+        // A trailing comma leaves an empty right-most segment after trimming; the
+        // `.filter(!is_empty)` must reject it and fall through to the fallback
+        // rather than returning "" (which would collapse callers into one bucket).
+        let mut h = HeaderMap::new();
+        h.insert("x-forwarded-for", "203.0.113.7, ".parse().unwrap());
+        assert_eq!(client_ip(&h, "127.0.0.1"), "127.0.0.1");
+    }
+}

backend/src/services/sse_tickets.rs

@@ -72,3 +72,58 @@ fn random_ticket() -> String {
     rng.fill(&mut bytes);
     bytes.iter().map(|b| format!("{b:02x}")).collect()
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn issue_then_consume_returns_the_hash_exactly_once() {
+        let store = SseTicketStore::new();
+        let ticket = store.issue("hash-1".into());
+        assert_eq!(store.consume(&ticket).as_deref(), Some("hash-1"));
+        // Single-use: a replay of the same ticket is rejected.
+        assert_eq!(store.consume(&ticket), None, "a consumed ticket must not be reusable");
+    }
+
+    #[test]
+    fn unknown_ticket_consumes_to_none() {
+        let store = SseTicketStore::new();
+        assert_eq!(store.consume("never-issued"), None);
+    }
+
+    #[test]
+    fn issued_tickets_are_unique_and_hex() {
+        let store = SseTicketStore::new();
+        let a = store.issue("h".into());
+        let b = store.issue("h".into());
+        assert_ne!(a, b, "each ticket must be unique");
+        assert_eq!(a.len(), 48, "24 random bytes → 48 hex chars");
+        assert!(a.chars().all(|c| c.is_ascii_hexdigit()));
+    }
+
+    #[test]
+    fn fresh_ticket_survives_prune() {
+        let store = SseTicketStore::new();
+        let ticket = store.issue("h".into());
+        store.prune(); // not expired → kept
+        assert_eq!(store.consume(&ticket).as_deref(), Some("h"));
+    }
+
+    #[test]
+    fn expired_ticket_consumes_to_none() {
+        // Construct an entry that is already past the TTL and confirm consume() rejects it.
+        let store = SseTicketStore::new();
+        let stale = "stale-ticket".to_string();
+        store.inner.lock().unwrap().insert(
+            stale.clone(),
+            Entry {
+                token_hash: "h".into(),
+                issued_at: Instant::now()
+                    .checked_sub(TTL + Duration::from_secs(1))
+                    .expect("host uptime should exceed the ticket TTL"),
+            },
+        );
+        assert_eq!(store.consume(&stale), None, "an expired ticket must not authenticate");
+    }
+}

backend/src/state.rs

@@ -3,6 +3,8 @@ use tokio::sync::broadcast;
 
 use crate::config::AppConfig;
 use crate::services::compression::CompressionWorker;
+use crate::services::config::ConfigCache;
+use crate::services::disk::DiskCache;
 use crate::services::rate_limiter::RateLimiter;
 use crate::services::sse_tickets::SseTicketStore;
 
@@ -31,13 +33,27 @@ pub struct AppState {
     pub compression: CompressionWorker,
     pub rate_limiter: RateLimiter,
     pub sse_tickets: SseTicketStore,
+    /// In-memory cache in front of the `config` table. Reads go through here; the
+    /// admin PATCH handler and the test reseed invalidate it after committing.
+    pub config_cache: ConfigCache,
+    /// Cached total/free bytes for the media filesystem (quota + admin stats).
+    pub disk_cache: DiskCache,
 }
 
 impl AppState {
     pub fn new(pool: PgPool, config: AppConfig) -> Self {
-        let (sse_tx, _) = broadcast::channel(256);
-        let compression =
-            CompressionWorker::new(pool.clone(), config.media_path.clone(), 2, sse_tx.clone());
+        // Broadcast buffer for live SSE fan-out. Sized to absorb a burst (e.g. many
+        // uploads landing at once during a busy moment) before a slow consumer lags and
+        // has to `resync`. The resync path is a correctness backstop, not the happy path —
+        // a roomier buffer keeps ~1000 concurrent clients from all resyncing at once.
+        let (sse_tx, _) = broadcast::channel(1024);
+        let compression = CompressionWorker::new(
+            pool.clone(),
+            config.media_path.clone(),
+            config.compression_concurrency,
+            sse_tx.clone(),
+        );
+        let config_cache = ConfigCache::new(pool.clone());
         Self {
             pool,
             config,
@@ -45,6 +61,8 @@ impl AppState {
             compression,
             rate_limiter: RateLimiter::new(),
             sse_tickets: SseTicketStore::new(),
+            config_cache,
+            disk_cache: DiskCache::new(),
         }
     }
 }

docker-compose.dev.yml

@@ -0,0 +1,13 @@
+# Dev-only overlay. NOT loaded automatically (unlike docker-compose.override.yml).
+# Opt in explicitly for local development when you need host access to Postgres:
+#   docker compose -f docker-compose.yml -f docker-compose.dev.yml up
+# Never use this overlay in production — it publishes the database port on the host.
+services:
+  db:
+    ports:
+      - "5432:5432"
+  app:
+    # Relax the production secret guard for local dev — the dev sentinel JWT_SECRET
+    # is tolerated (warned) rather than rejected.
+    environment:
+      APP_ENV: development

docker-compose.override.yml

@@ -1,4 +0,0 @@
-services:
-  db:
-    ports:
-      - "5432:5432"

docker-compose.yml

@@ -14,6 +14,10 @@ services:
       interval: 5s
       timeout: 5s
       retries: 10
+    deploy:
+      resources:
+        limits:
+          memory: 512M
 
   app:
     build:
@@ -21,13 +25,32 @@ services:
       dockerfile: Dockerfile
     restart: unless-stopped
     env_file: .env
+    environment:
+      # Activates the production secret guard in config.rs — refuses to boot with
+      # placeholder JWT_SECRET / ADMIN_PASSWORD_HASH.
+      APP_ENV: production
     depends_on:
       db:
         condition: service_healthy
     volumes:
       - media_data:/media
+      # Export archives live OUTSIDE /media so the public media ServeDir can't
+      # serve them — downloads go only through the ticket-gated handler.
+      - exports_data:/exports
     expose:
       - "3000"
+    healthcheck:
+      test: ["CMD-SHELL", "wget -q -O- http://localhost:3000/health || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 20s
+    deploy:
+      resources:
+        limits:
+          # Bounds a runaway ffmpeg transcode (large uploads, 2 workers) so it can't
+          # OOM the single box and take down Postgres.
+          memory: 1G
 
   frontend:
     build:
@@ -35,10 +58,24 @@ services:
       dockerfile: Dockerfile
     restart: unless-stopped
     env_file: .env
+    environment:
+      # adapter-node behind Caddy TLS needs the public origin for CSRF checks on
+      # POST form actions — without it they fail only in production.
+      ORIGIN: "https://${DOMAIN}"
     depends_on:
       - app
     expose:
       - "3001"
+    healthcheck:
+      test: ["CMD-SHELL", "wget -q -O- http://localhost:3001/ >/dev/null 2>&1 || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 15s
+    deploy:
+      resources:
+        limits:
+          memory: 256M
 
   caddy:
     image: caddy:2-alpine
@@ -50,10 +87,17 @@ services:
       - ./Caddyfile:/etc/caddy/Caddyfile:ro
       - caddy_data:/data
     depends_on:
-      - app
-      - frontend
+      app:
+        condition: service_healthy
+      frontend:
+        condition: service_healthy
+    deploy:
+      resources:
+        limits:
+          memory: 256M
 
 volumes:
   postgres_data:
   media_data:
+  exports_data:
   caddy_data:

docs/DECISION-media-auth.md

@@ -0,0 +1,79 @@
+# Decision: media serving — unauthenticated UUID vs. signed gateway
+
+**Status:** OPEN — needs a call. Written 2026-06-30 from the 2026-06-27 audit
+(`fix/audit-2026-06-27-critical-medium`), which implemented the signed-gateway option that
+`main` did not adopt.
+
+**Scope:** how `main` serves uploaded photos/videos (originals + previews/thumbnails) to the
+`<img>`/`<video>` tags in the feed, lightbox, and diashow.
+
+---
+
+## The two models
+
+### A. Current `main` — unauthenticated, UUID-as-capability
+- `/api/v1/upload/{id}/original` — **no auth**; the unguessable upload UUID *is* the capability.
+  (Documented as intentional in `frontend/src/lib/data-mode-store.ts`.)
+- `/media/*` — static `axum` `ServeDir`, **no auth layer**, serves preview/thumbnail files by path.
+- No expiry, no signature, no per-request authorization on the bytes.
+- **Works with** plain `<img src>` (no Authorization header needed) and browser caching, at zero
+  per-request backend cost.
+
+### B. Audit branch — authenticated signed gateway
+- `/media/{kind}/{id}?sig=…` via `handlers::media::serve`.
+- HMAC signature (keyed off `jwt_secret`), **time-boxed** (~24 h, bucketed to a 1 h
+  URL-stability window so warm fetches stay cacheable).
+- Authorizes by **signature + uploader visibility**, not requester identity.
+- Still `<img>`-compatible (capability rides in the query string, not a header).
+- Cost: token mint/verify, ~2 DB queries per *cold* fetch, and the HMAC key currently reuses
+  `jwt_secret` (see "Media HMAC domain separation" in [SECURITY-BACKLOG.md](SECURITY-BACKLOG.md)).
+
+---
+
+## What actually differs (the tradeoff)
+
+| | A. UUID (main) | B. Signed gateway (audit) |
+|---|---|---|
+| Leaked URL/UUID (forwarded link, browser history, referer, logs) | **Permanent** full-res access | Access **expires** (~24 h); URL can't be re-minted |
+| Banned / departed guest | Retains **permanent** access to every original whose UUID they hold | Can't mint new URLs; can replay **held** URLs ≤ TTL only |
+| Revocation | None (UUID is forever) | Rotate the signing key → all outstanding URLs die |
+| Enumeration | Mitigated by UUIDv4 unguessability | Same, plus signature |
+| Per-request cost | Zero (static serve) | Token verify + ~2 DB queries (cold) |
+| Plumbing / failure surface | Minimal | Token mint/verify, key mgmt, cache-bucket logic |
+
+Neither model solves the fundamental `<img>`-can't-send-a-Bearer constraint: once a browser holds
+a media URL, it is replayable for that URL's lifetime. Model B simply **bounds that lifetime** and
+**adds revocability**; Model A's lifetime is *forever*.
+
+## Threat model (this deployment)
+
+Private single-box event app, ~100 guests, ~1 000 files, one event at a time. Media is **shared
+with all guests by design** — it is personal but not secret *within* the event. The real risk is
+**a URL escaping the event boundary** (a guest forwards a link; it lands in chat history, a public
+post, or server/proxy logs) granting an outsider — or a removed guest — access.
+
+## Recommendation
+
+This is a judgment call, not a clear-cut bug, so it's yours to make. My leaning:
+
+- **Adopt Model B (signed gateway)** if post-event link leakage or removed-guest access is a real
+  concern for you — it's the materially stronger posture (bounded exposure + key-rotation
+  revocation) and the implementation already exists on the audit branch. If adopted, also do the
+  cheap **HKDF domain-separation** for the HMAC key (backlog 🅱).
+- **Keep Model A (UUID)** as an *explicitly accepted risk* if you're comfortable that a leaked
+  link = permanent access at this scale. If so, two cheap hardening steps are still worth doing:
+  1. **Log hygiene** — ensure the upload UUID never lands in access logs with enough context to
+     correlate (the `TraceLayer` logs the request *path*, and `/api/v1/upload/{id}/original`
+     puts the UUID *in the path*). Confirm logs aren't shipped/retained where that matters.
+  2. **Document the decision** in `README`/`PROJECT.md` so "unauthenticated media" is a recorded
+     choice, not an oversight.
+
+**Sharpest single fact to decide on:** in Model A, a guest you *ban* keeps full-resolution access
+to every original they ever loaded, forever. In Model B, that access dies within ~24 h. If that
+asymmetry matters for your events, adopt the gateway.
+
+## If you adopt B
+The implementation lives on `origin/fix/audit-2026-06-27-critical-medium`:
+`backend/src/handlers/media.rs` (+ `media_token`), the `/media/{kind}/{id}` route in `main.rs`, and
+the feed/upload/host changes that emit signed URLs (`models/upload.rs`, `handlers/feed.rs`). It
+would need re-basing onto current `main` (which has since diverged across ~80 files).

docs/SECURITY-BACKLOG.md

@@ -0,0 +1,107 @@
+# Security & Hardening Backlog
+
+Tracks the deliberately-deferred items from the 2026-06-27 security audit and its review passes.
+
+**Provenance & reconciliation.** This document was extracted from the
+`fix/audit-2026-06-27-critical-medium` branch and reconciled against `main` on 2026-06-30.
+That audit's Critical→Medium findings were **largely re-implemented into `main`** through the
+later batch branches (security-review-followups, security-review-batch-2, the UX batches) rather
+than by merging the audit branch — so `git` shows no merge, but the controls are present. Each
+item below is tagged with its **current status in `main`**:
+
+- ✅ **Done in main** — addressed (possibly via a different implementation).
+- ⬜ **Open** — still applies to `main`.
+- 🔀 **Contingent** — only relevant if `main` adopts the audit's signed-media gateway (see
+  [DECISION-media-auth.md](DECISION-media-auth.md)).
+
+> The audit branch additionally implemented an **authenticated, signed media gateway** that `main`
+> did **not** adopt — `main` serves media unauthenticated (static `ServeDir` + UUID-capability
+> `/api/v1/upload/{id}/original`). That architectural choice is written up separately in
+> [DECISION-media-auth.md](DECISION-media-auth.md); the "by-design notes" at the bottom of this
+> file describe the *audit branch's* model and apply to `main` only if that gateway is adopted.
+
+---
+
+## 🅱 Worth a tracked ticket (real, not one-liners)
+
+- ⬜ **Moderation UI gap** — the backend `DELETE /host/upload/{id}` and `DELETE /host/comment/{id}`
+  endpoints have **no frontend caller**, so a host cannot remove a *guest's* content from the UI
+  (the feed `ContextSheet` only offers delete for the viewer's *own* uploads —
+  `target.user_id === myUserId`). Still a functional hole in `main`. Needs a host-facing "remove"
+  action wired to those endpoints, gated on host/admin role.
+
+- ✅/⬜ **Feed reactivity** — *Mostly fixed in `main`.* The full-reload-on-every-SSE-event problem
+  (a single `like-update`/`new-comment`/`upload-processed` calling `loadFeed(true)` and collapsing
+  a scrolled feed) was fixed in the UX batch: `main` now patches the affected card in place
+  (`patchCount`) and debounces processing (`scheduleInPlaceRefresh`). ⬜ **Remaining sub-item:**
+  owner-deleted uploads are still not broadcast — `delete_upload` returns `204` with no
+  `upload-deleted` SSE, so other clients keep showing a deleted post until refresh (only host
+  deletes broadcast). Emit `upload-deleted` from the owner delete path too.
+
+- 🔀 **Media HMAC domain separation** — *Only applies if the signed-media gateway is adopted.* The
+  audit's signed-media tokens reuse `jwt_secret` as the HMAC key; a dedicated derived key
+  (`HKDF(jwt_secret, "media-url")`) would isolate the domains so a future change to one can't
+  weaken the other. N/A to `main` as it stands (no signed media).
+
+- ⬜ **Quota mount-detection + low-disk guard** — *Still applies to `main`.* `compute_storage_quota`
+  (`backend/src/handlers/upload.rs`) and `admin.rs` pick the disk via `starts_with`, so root (`/`)
+  is a wildcard prefix that can match the wrong device; and there's no hard min-free-space
+  precheck when the quota is disabled. Use longest-prefix match; add an unconditional 507/429 when
+  free space is critically low.
+
+## ✅ Fixed in main since the audit (for the record)
+
+These audit findings are present in `main` today (verified 2026-06-30): server-side MIME/ext
+allowlist on upload, recovery-PIN lockout backoff, DB port no longer publicly exposed, bcrypt
+offloaded via `spawn_blocking`, bounded compression concurrency (semaphore), bounded feed queries
+(`LIMIT ≤ 100`), and the viewport-fit / reduced-motion / aria a11y pass. An image-decode
+decompression-bomb cap (`image::Limits` 12000×12000 / 256 MiB) lives in
+`backend/src/services/compression.rs`.
+
+**Fixed in the 2026-07 review pass** (previously *claimed* fixed here but were not — corrected):
+- **Effective JWT production-secret guard** — `APP_ENV=production` is now set for the app service,
+  and `config.rs::validate_secrets` rejects any placeholder-ish `JWT_SECRET`/`ADMIN_PASSWORD_HASH`
+  (not just the exact dev sentinel) and enforces `len ≥ 32` unconditionally in prod.
+- **Unspoofable client IP in the rate limiter** — `client_ip` now takes the right-most
+  `X-Forwarded-For` entry (the hop Caddy appends), so a client-supplied left-most value is ignored.
+- **Live role/ban re-check** — the auth extractor re-reads the user row and trusts the DB `role`
+  and `is_banned` flag rather than the JWT claim, so a demote/ban takes effect immediately (no
+  30-day token window). Bans are enforced on write handlers + the host/admin extractors, preserving
+  the documented read-only access for banned guests (USER_JOURNEYS §10); demoted hosts lose host
+  powers at once.
+- **Container healthchecks** — `app` and `frontend` now have healthchecks and Caddy waits on
+  `service_healthy`.
+- **Event-scoped `ban_user`** — the ban UPDATE is now scoped by `event_id` like its siblings.
+
+## 🅲 Consciously won't-fix at ~100-guest single-box scale
+
+Diminishing returns vs. the deployment's actual threat model. Revisit only if the scale or
+tenancy model changes.
+
+- Rate-limiter `HashMap` key LRU/cap (attacker-chosen `recover:{ip}:{name}` keys accumulate up to
+  the 24h prune ceiling) — bounded and pruned; not worth an LRU.
+- "Last host" / host↔host role-churn guard — operational, low blast radius.
+- Performance micro-indexes (`idx_like_user_upload`, comment pagination index) — current queries
+  are sub-ms at this row count.
+- Optimistic-like in-flight guard, ownership-snapshot-at-mount, assorted copy tweaks — UX polish.
+- **Mid-session ban does not tear down an already-open SSE stream.** The live-ban check lives in the
+  `AuthUser` extractor, but the stream authenticates via ticket→session (`handlers/sse.rs::stream`),
+  so a user banned while connected keeps receiving broadcast events until their stream drops. New
+  tickets *are* blocked (`issue_ticket` uses `AuthUser`), so they cannot reconnect. Low blast radius
+  (read-only feed events, no re-subscribe); tearing live streams down would need a per-session
+  broadcast filter. Revisit only if bans must take effect within seconds.
+
+## By-design notes (audit branch's signed-media model — see DECISION-media-auth.md)
+
+> These describe the **audit branch's** signed-gateway model. `main` does **not** serve media this
+> way; for `main`'s actual media-access posture and the tradeoff, see
+> [DECISION-media-auth.md](DECISION-media-auth.md).
+
+- **Banned user retains ≤24h media access via already-held signed URLs.** The audit's media gateway
+  authorizes by *signature + uploader visibility*, not requester identity, and signed URLs are
+  time-boxed (24h, bucketed). A banned/revoked-session user cannot mint new URLs (every API call
+  401/403s) but can replay URLs they already hold until expiry — only for content they already saw.
+  Accepted there: tightening would require per-request identity on every `<img>` load, which the
+  `<img>`-can't-send-a-Bearer constraint precludes.
+- **Two DB queries per *cold* media fetch** (`upload` row + uploader row). Mitigated by browser
+  caching and the stable bucketed URL. Could be one JOIN if it ever shows up in profiling.

docs/USER_JOURNEYS.md

@@ -129,9 +129,9 @@ the Host can clean up later).
    viewer). Progress is visible in the Admin dashboard's Export tab; SSE
    `export-progress` keeps it live; `export-available` notifies all guests when ready.
 5. **Nutzerverwaltung** — search users; per-user controls:
-   - **Sperren** opens a confirmation modal with a checkbox "Uploads aus der Galerie
-     ausblenden" — Host chooses whether to hide the user's existing uploads or leave them
-     visible. Submitting calls `POST /host/users/{id}/ban` with `hide_uploads`.
+   - **Sperren** opens a confirmation modal. Banning **always hides** the user's existing
+     uploads (a banned user's content is "gone" everywhere) — there is no opt-out. Submitting
+     calls `POST /host/users/{id}/ban` (no body).
    - **Entsperren** lifts the ban.
    - **Host** promotes a guest to host.
    - **Degradieren** — visible on Host rows. A Host can demote *other* Hosts back to
@@ -147,12 +147,22 @@ the Host can clean up later).
 
 ## 10. Banned-guest experience
 
-1. The banned user's next authenticated request returns HTTP 403 with a clear message
-   ("Du bist gesperrt.").
-2. They can still browse the read-only feed (and download the export once it's released).
-3. They cannot upload, like, or comment.
-4. If `hide_uploads` was set on the ban, their existing uploads are filtered out of the
-   feed for everyone (the `v_feed` view already enforces this).
+1. The ban takes effect immediately on the banned user's existing session — the auth
+   layer re-reads the live `is_banned` flag on every request rather than trusting the
+   JWT, so there's no 30-day token-lifetime window.
+2. Their next authenticated *write* request returns HTTP 403 with a clear message
+   ("Du bist gesperrt."). Ban enforcement lives on the write handlers and the
+   host/admin extractors, not the base auth extractor.
+3. They can still browse the read-only feed (and download the export once it's released).
+   Their sessions are **not** revoked — this is a read-only ban, not a logout. Their own
+   live SSE stream is dropped by the `is_banned` revalidation (no live pushes), but plain
+   feed reads still work.
+4. They cannot upload, like, or comment; a banned host also loses all host/admin
+   actions (including unbanning themselves).
+5. Banning **always hides**: the user's existing uploads are filtered out of the feed for
+   everyone (`v_feed`, `find_visible_media`, and the export query all enforce
+   `is_banned = FALSE`), and a live `user-hidden` SSE event evicts their cards from every
+   open feed + the diashow without a reload.
 
 ## 11. Admin — instance configuration
 

e2e/Caddyfile.test

@@ -4,7 +4,17 @@
 # of HTTPS/Let's Encrypt.
 
 :3101 {
-    encode zstd gzip
+    # Mirror prod: exclude the SSE stream from compression so buffering doesn't
+    # delay real-time events (and so the test stack exercises the real behavior).
+    @compressible not path /api/v1/stream
+    encode @compressible zstd gzip
+
+    # Mirror prod's security headers (minus HSTS, which is HTTPS-only).
+    header {
+        X-Content-Type-Options "nosniff"
+        X-Frame-Options "DENY"
+        Referrer-Policy "strict-origin-when-cross-origin"
+    }
 
     reverse_proxy /api/* app:3000
     reverse_proxy /media/* app:3000

e2e/fixtures/api-client.ts

@@ -117,6 +117,25 @@ export class ApiClient {
     });
   }
 
+  async unbanUser(token: string, userId: string, opts: { expectedStatus?: number | number[] } = {}) {
+    return this.request<void>('POST', `/host/users/${userId}/unban`, {
+      token,
+      expectedStatus: opts.expectedStatus ?? [200, 204],
+    });
+  }
+
+  /** Reset another user's PIN. Returns the plaintext PIN the host must relay once. */
+  async resetUserPin(
+    token: string,
+    userId: string,
+    opts: { expectedStatus?: number | number[] } = {}
+  ): Promise<{ status: number; body: { pin?: string } }> {
+    return this.request<{ pin?: string }>('POST', `/host/users/${userId}/pin-reset`, {
+      token,
+      expectedStatus: opts.expectedStatus ?? [200],
+    });
+  }
+
   async closeEvent(token: string) {
     return this.request<void>('POST', '/host/event/close', { token, expectedStatus: [200, 204] });
   }

e2e/fixtures/db.ts

@@ -68,6 +68,17 @@ export const db = {
     );
   },
 
+  /**
+   * Flip the `export_zip_ready` gate directly. The download handler serves bytes
+   * only when this boolean is true AND the file exists on disk, so setting it true
+   * without a file lets tests exercise the "ready but file missing" 404 branch.
+   */
+  async setExportZipReady(slug: string, ready: boolean) {
+    await withClient((c) =>
+      c.query(`UPDATE event SET export_zip_ready = $2 WHERE slug = $1`, [slug, ready])
+    );
+  },
+
   /** Insert a pre-baked export job row to skip the (slow) real compression path. */
   async fakeExportJob(eventSlug: string, type: 'zip' | 'html', status: 'pending' | 'running' | 'done') {
     await withClient(async (c) => {

e2e/helpers/seed.ts

@@ -0,0 +1,68 @@
+/**
+ * Shared seed helpers so specs don't each hand-roll the upload/comment create
+ * flow. Centralising the API contract (routes, field names, expected statuses)
+ * means an API change is a one-file edit, not a 7-file hunt.
+ */
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { uploadRaw } from './upload-client';
+import { db } from '../fixtures/db';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+// A real, decodable JPEG. Magic-bytes-only fakes now get auto-cleaned by the
+// backend when compression fails (a failed transcode refunds quota + deletes the
+// row), which would delete the seeded upload out from under the test. Read lazily
+// at call time (cwd is the e2e dir at runtime, like the gallery-path spec) so test
+// collection can't trip on a module-load read.
+let sampleJpg: Buffer | null = null;
+function sampleImage(): Buffer {
+  if (!sampleJpg) {
+    sampleJpg = readFileSync(join(process.cwd(), 'fixtures', 'media', 'sample.jpg'));
+  }
+  return sampleJpg;
+}
+
+export type SeedUploadOptions = {
+  caption?: string;
+  /** Mark compression done so the card is fully rendered in the feed. Default true. */
+  visible?: boolean;
+};
+
+/** Seed a real, accepted upload owned by `jwt` and return its id. */
+export async function seedUpload(jwt: string, opts: SeedUploadOptions = {}): Promise<string> {
+  const res = await uploadRaw(jwt, sampleImage(), {
+    filename: 'a.jpg',
+    contentType: 'image/jpeg',
+    caption: opts.caption,
+  });
+  if (res.status !== 201) throw new Error(`seedUpload failed: ${res.status} ${await res.text()}`);
+  const { id } = await res.json();
+  if (opts.visible !== false) await db.setUploadCompressionStatus(id, 'done');
+  return id;
+}
+
+/** Seed a comment on `uploadId` authored by `jwt`; return its id. */
+export async function seedComment(jwt: string, uploadId: string, body: string): Promise<string> {
+  const res = await fetch(`${BASE}/api/v1/upload/${uploadId}/comments`, {
+    method: 'POST',
+    headers: { Authorization: `Bearer ${jwt}`, 'Content-Type': 'application/json' },
+    body: JSON.stringify({ body }),
+  });
+  if (res.status !== 201) throw new Error(`seedComment failed: ${res.status} ${await res.text()}`);
+  return (await res.json()).id;
+}
+
+/** Read the comments for an upload as `jwt`. */
+export async function listComments(jwt: string, uploadId: string): Promise<any[]> {
+  const res = await fetch(`${BASE}/api/v1/upload/${uploadId}/comments`, {
+    headers: { Authorization: `Bearer ${jwt}` },
+  });
+  return res.json();
+}
+
+/** Resolve a single upload row from a feed response whose envelope shape isn't pinned. */
+export function findFeedRow(feed: any, id: string): any {
+  const list: any[] = feed.uploads ?? feed.items ?? feed;
+  return Array.isArray(list) ? list.find((u: any) => u.id === id) : undefined;
+}

e2e/helpers/sse-listener.ts

@@ -3,10 +3,13 @@
  * `like-update` arrived for upload X within 5 seconds" without driving a
  * second browser tab.
  *
- * The backend authenticates the SSE endpoint via `?token=` query param
- * (the EventSource API can't set headers).
+ * The backend authenticates the SSE endpoint via a single-use `?ticket=` minted
+ * at POST /api/v1/stream/ticket (the raw JWT is never put in the URL). This helper
+ * does that exchange internally, so callers still just pass a JWT to `start()`.
  */
 
+import { mintSseTicket } from './sse';
+
 export type SseEvent = { type: string; data: any; receivedAt: number };
 
 export class SseListener {
@@ -17,7 +20,10 @@ export class SseListener {
   constructor(private baseUrl: string = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101') {}
 
   async start(token: string): Promise<void> {
-    const url = `${this.baseUrl}/api/v1/stream?token=${encodeURIComponent(token)}`;
+    // Exchange the JWT for a single-use SSE ticket (the stream endpoint no longer
+    // accepts ?token=).
+    const ticket = await mintSseTicket(token);
+    const url = `${this.baseUrl}/api/v1/stream?ticket=${encodeURIComponent(ticket)}`;
     // Use fetch with streaming since Node has no EventSource by default.
     const res = await fetch(url, { signal: this.controller.signal });
     if (!res.body) throw new Error('SSE response has no body');

e2e/helpers/sse.ts

@@ -0,0 +1,43 @@
+/**
+ * Shared SSE-flow helpers. The stream auth flow (mint a single-use ticket, open
+ * with `?ticket=`) is security-sensitive and recently changed from `?token=`, so
+ * it lives in one place instead of being re-inlined per spec.
+ */
+import type { Page } from '@playwright/test';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+/** Exchange a JWT for a single-use SSE ticket via POST /api/v1/stream/ticket. */
+export async function mintSseTicket(jwt: string): Promise<string> {
+  const res = await fetch(`${BASE}/api/v1/stream/ticket`, {
+    method: 'POST',
+    headers: { Authorization: `Bearer ${jwt}` },
+  });
+  if (res.status !== 200) throw new Error(`mintSseTicket failed: ${res.status} ${await res.text()}`);
+  return (await res.json()).ticket;
+}
+
+/** Open the SSE stream with a ticket, return the HTTP status, and tear the stream down. */
+export async function openStream(ticket: string): Promise<number> {
+  const c = new AbortController();
+  try {
+    const res = await fetch(`${BASE}/api/v1/stream?ticket=${encodeURIComponent(ticket)}`, {
+      signal: c.signal,
+    });
+    return res.status;
+  } finally {
+    c.abort();
+  }
+}
+
+/**
+ * Count EventSource opens (GET /api/v1/stream?ticket=…) on a page — NOT the ticket
+ * POST. Returns a getter for the running count.
+ */
+export function trackStreamOpens(page: Page): () => number {
+  let n = 0;
+  page.on('request', (req) => {
+    if (req.method() === 'GET' && req.url().includes('/api/v1/stream?')) n++;
+  });
+  return () => n;
+}

e2e/page-objects/recover-page.ts

@@ -21,7 +21,15 @@ export class RecoverPage {
 
   async recover(name: string, pin: string) {
     await this.nameInput.fill(name);
+    // Filling the 4th digit fires the form's auto-submit (the onPinInput handler
+    // calls handleRecover once pin.length === 4, see pin-auto-submit.spec). An explicit
+    // submit click would race the ensuing navigation and detach mid-click, so only click
+    // as a fallback if the button is still around (e.g. a partial / failed PIN).
     await this.pinInput.fill(pin);
-    await this.submitButton.click();
+    if (await this.submitButton.isEnabled().catch(() => false)) {
+      await this.submitButton.click().catch(() => {
+        /* auto-submit already navigated — nothing to click */
+      });
+    }
   }
 }

e2e/playwright.config.ts

@@ -12,6 +12,12 @@ import { defineConfig, devices } from '@playwright/test';
  * engine-level divergences. The rest of the suite only runs against
  * `chromium-desktop` to keep the wall-clock reasonable.
  */
+// camera/microphone/clipboard are Chromium-only permissions; passing them to
+// firefox/webkit projects throws "Unknown permission: camera" and fails the
+// whole test before it runs. Granted per-Chromium-project below instead of in
+// the global `use` block.
+const CHROMIUM_PERMISSIONS = ['camera', 'microphone', 'clipboard-read', 'clipboard-write'];
+
 export default defineConfig({
   testDir: './specs',
   outputDir: './test-results',
@@ -35,9 +41,8 @@ export default defineConfig({
     video: 'retain-on-failure',
     actionTimeout: 10_000,
     navigationTimeout: 30_000,
-    // Camera/mic permissions granted by default; the fake-media launch args
-    // (set per-project below for Chromium) supply the actual stream.
-    permissions: ['camera', 'microphone', 'clipboard-read', 'clipboard-write'],
+    // No camera/mic/clipboard here — those are Chromium-only and are granted on
+    // the Chromium projects below (see CHROMIUM_PERMISSIONS).
   },
 
   projects: [
@@ -49,6 +54,7 @@ export default defineConfig({
       testIgnore: ['**/09-mobile/**'],
       use: {
         ...devices['Desktop Chrome'],
+        permissions: CHROMIUM_PERMISSIONS,
         launchOptions: {
           args: [
             '--use-fake-ui-for-media-stream',
@@ -68,13 +74,13 @@ export default defineConfig({
     {
       name: 'chromium-mobile',
       testMatch: ['**/09-mobile/**/*.spec.ts'],
-      use: { ...devices['Pixel 7'] },
+      use: { ...devices['Pixel 7'], permissions: CHROMIUM_PERMISSIONS },
     },
 
     // ── Mobile UA smoke matrix (runs only @smoke specs in CI) ────────────
     {
       name: 'chromium-pixel7',
-      use: { ...devices['Pixel 7'] },
+      use: { ...devices['Pixel 7'], permissions: CHROMIUM_PERMISSIONS },
       grep: /@smoke/,
     },
     {
@@ -84,6 +90,7 @@ export default defineConfig({
         viewport: { width: 360, height: 780 },
         userAgent:
           'Mozilla/5.0 (Linux; Android 14; SM-S911B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36',
+        permissions: CHROMIUM_PERMISSIONS,
       },
       grep: /@smoke/,
     },
@@ -94,6 +101,7 @@ export default defineConfig({
         viewport: { width: 360, height: 780 },
         userAgent:
           'Mozilla/5.0 (Linux; Android 14; SM-S911B) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/24.0 Chrome/124.0.0.0 Mobile Safari/537.36',
+        permissions: CHROMIUM_PERMISSIONS,
       },
       grep: /@smoke/,
     },
@@ -103,6 +111,7 @@ export default defineConfig({
         ...devices['Pixel 7'],
         userAgent:
           'Mozilla/5.0 (Linux; Android 14; Pixel 7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Mobile Safari/537.36 EdgA/124.0.0.0',
+        permissions: CHROMIUM_PERMISSIONS,
       },
       grep: /@smoke/,
     },
@@ -125,6 +134,9 @@ export default defineConfig({
       use: {
         ...devices['Pixel 7'],
         defaultBrowserType: 'firefox',
+        // Firefox rejects `isMobile` (Chromium-only). Keep the phone viewport +
+        // Android UA for coverage, but drop the unsupported flag.
+        isMobile: false,
         userAgent:
           'Mozilla/5.0 (Android 14; Mobile; rv:124.0) Gecko/124.0 Firefox/124.0',
       },

e2e/specs/01-auth/join.spec.ts

@@ -54,9 +54,13 @@ test.describe('Auth — join flow', () => {
     await expect(join.recoveryPinInput).toBeVisible();
     await expect(page.getByText(/Charlie.*bereits vergeben/)).toBeVisible();
 
-    // Type correct PIN → land on /feed with a new JWT
+    // Type correct PIN → land on /feed with a new JWT. Filling the 4th digit
+    // auto-submits (see pin-auto-submit.spec), so an explicit submit click would
+    // race the navigation; click only as a fallback if the button is still around.
     await join.recoveryPinInput.fill(original.pin);
-    await join.recoverySubmit.click();
+    if (await join.recoverySubmit.isEnabled().catch(() => false)) {
+      await join.recoverySubmit.click().catch(() => {});
+    }
     await page.waitForURL('**/feed');
 
     const storage = await readStorage(page);

e2e/specs/01-auth/recover-enumeration.spec.ts

@@ -0,0 +1,26 @@
+/**
+ * Security fix F4: /recover no longer leaks whether a display name exists. Previously an
+ * unknown name returned 404 ("Kein Benutzer …") while an existing name + wrong PIN
+ * returned 401 ("PIN ist falsch") — a response (and bcrypt-timing) oracle for account
+ * enumeration. Now both return an identical 401.
+ */
+import { test, expect } from '../../fixtures/test';
+
+test.describe('Auth — recover does not leak account existence (F4)', () => {
+  test('unknown name and wrong PIN both return an identical 401', async ({ api, guest }) => {
+    // Establish the event + a real user first (a truncate wipes the event row; the join
+    // recreates it — otherwise recover 404s on "event not found" before name resolution).
+    const g = await guest('RealPerson');
+
+    // Unknown display name → 401 "PIN ist falsch" (NOT a 404 revealing non-existence).
+    const unknown = await api.recover('NoSuchPersonXYZ', '0000', { expectedStatus: [401] });
+    expect(unknown.status).toBe(401);
+    expect(JSON.stringify(unknown.body)).toContain('PIN');
+
+    // A real user with a wrong PIN returns the same 401 shape.
+    const wrongPin = g.pin === '0001' ? '0002' : '0001';
+    const wrong = await api.recover('RealPerson', wrongPin, { expectedStatus: [401] });
+    expect(wrong.status).toBe(401);
+    expect(JSON.stringify(wrong.body)).toContain('PIN');
+  });
+});

e2e/specs/02-upload/gallery-path.spec.ts

@@ -38,15 +38,14 @@ test.describe('Upload — gallery path', () => {
     await expect.poll(() => db.countUploadsForUser(h.userId), { timeout: 10_000 }).toBe(2);
   });
 
-  test.fixme('UI flow: FAB → UploadSheet → /upload → submit drives a real XHR upload', async ({ page, guest, signIn, db }) => {
-    // The full UI flow (BottomNav FAB → UploadSheet → /upload page → handleSubmit →
-    // upload-queue.ts XHR) does not currently complete within the test window in
-    // Playwright. The XHR doesn't appear in backend logs. Suspected cause: the
-    // queue worker fires after the page navigates from /upload to /feed via
-    // SvelteKit's goto(), but the blob/IDB chain may not survive the unmount/
-    // remount cycle in Playwright's headless Chromium. Needs deeper
-    // investigation; tracked as a fixme for now. API-driven tests above cover
-    // the data contract.
+  test('UI flow: FAB → UploadSheet → /upload → submit drives a real XHR upload', async ({ page, guest, signIn, db }) => {
+    // Previously fixme'd: the UI queue never fired a POST. Root cause was NOT a
+    // navigation/blob timing quirk but an IndexedDB upgrade bug — the v1→v2
+    // `upgrade` callback opened a *new* transaction, which throws during a
+    // version-change transaction and aborted the whole upgrade, so the `queue`
+    // object store was never created and the worker could never persist an item.
+    // Fixed in upload-queue.ts by reusing the callback's version-change
+    // transaction. This test guards against regressing that.
     const h = await guest('UploaderUI');
     await signIn(page, h);
     const feed = new FeedPage(page);

e2e/specs/02-upload/rate-limit.spec.ts

@@ -6,8 +6,12 @@
  */
 import { test, expect } from '../../fixtures/test';
 import { join } from 'node:path';
+import { readFileSync } from 'node:fs';
 
 const SAMPLE_JPG = join(process.cwd(), 'fixtures', 'media', 'sample.jpg');
+// A real, decodable JPEG — the upload handler validates magic bytes, so a
+// zero-filled buffer would be rejected with 400 before the rate limiter is reached.
+const SAMPLE_BYTES = readFileSync(SAMPLE_JPG);
 
 test.describe('Upload — rate limit', () => {
   test('4th upload in one hour returns 429 with Retry-After', async ({ api, adminToken, guest }) => {
@@ -24,7 +28,7 @@ test.describe('Upload — rate limit', () => {
     // Hit the API directly for speed — UI behavior is asserted in gallery-path.spec.
     const upload = async (n: number) => {
       const form = new FormData();
-      const blob = new Blob([new Uint8Array(640)], { type: 'image/jpeg' });
+      const blob = new Blob([SAMPLE_BYTES], { type: 'image/jpeg' });
       form.append('file', blob, `file${n}.jpg`);
       form.append('content_type', 'image/jpeg');
       return fetch((process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101') + '/api/v1/upload', {
@@ -47,7 +51,6 @@ test.describe('Upload — rate limit', () => {
     // The 429 response carries Retry-After.
     const limited = responses.find((r) => r.status === 429)!;
     expect(limited.headers.get('retry-after')).toBeTruthy();
-    void SAMPLE_JPG;
   });
 
   test('flipping upload_rate_enabled off bypasses the limit', async ({ api, adminToken, guest }) => {
@@ -56,7 +59,7 @@ test.describe('Upload — rate limit', () => {
     const h = await guest('NoQuota');
     const upload = async (n: number) => {
       const form = new FormData();
-      const blob = new Blob([new Uint8Array(640)], { type: 'image/jpeg' });
+      const blob = new Blob([SAMPLE_BYTES], { type: 'image/jpeg' });
       form.append('file', blob, `file${n}.jpg`);
       form.append('content_type', 'image/jpeg');
       return fetch((process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101') + '/api/v1/upload', {

e2e/specs/03-feed/comment-ui.spec.ts

@@ -0,0 +1,53 @@
+/**
+ * Regression for the review's CR1: the LightboxModal posted comments to
+ * `/upload/{id}/comment` (singular) while the only route is `/comments` (plural),
+ * so every comment submitted through the UI 404'd and was silently lost. The
+ * earlier "comment → SSE" spec passed by posting via a fetch helper, bypassing
+ * the component — a false green. This drives the real component end-to-end.
+ */
+import { test, expect } from '../../fixtures/test';
+import { seedUpload } from '../../helpers/seed';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+test.describe('Comments — UI round-trip (CR1)', () => {
+  test('a comment typed in the lightbox persists to the backend', async ({
+    page,
+    guest,
+    signIn,
+  }) => {
+    const author = await guest('CommentAuthor');
+    const commenter = await guest('Commenter');
+    const uploadId = await seedUpload(author.jwt, { caption: 'Comment target' });
+
+    await signIn(page, commenter);
+    await page.goto('/feed');
+
+    // Open the lightbox. Only one upload exists, so the first open-button is it.
+    const imageButton = page.getByRole('button', { name: 'Bild vergrößern' }).first();
+    await expect(imageButton).toBeVisible({ timeout: 15_000 });
+    await imageButton.click();
+
+    const lightbox = page.locator('[role="dialog"][aria-labelledby="lightbox-title"]');
+    await expect(lightbox).toBeVisible();
+
+    const text = `Wunderschönes Foto ${Date.now()}`;
+    await lightbox.getByPlaceholder(/kommentar/i).fill(text);
+    await lightbox.getByRole('button', { name: /senden/i }).click();
+
+    // The component appends the comment only on a 2xx — with the old singular path
+    // it threw and nothing appeared. Assert it's visible in the panel...
+    await expect(lightbox.getByText(text)).toBeVisible();
+
+    // ...and that it actually persisted server-side (the crux CR1 broke).
+    await expect
+      .poll(async () => {
+        const res = await fetch(`${BASE}/api/v1/upload/${uploadId}/comments`, {
+          headers: { Authorization: `Bearer ${commenter.jwt}` },
+        });
+        const body = await res.json();
+        return Array.isArray(body) && body.some((c: { body: string }) => c.body === text);
+      })
+      .toBe(true);
+  });
+});

e2e/specs/03-feed/filter-search.spec.ts

@@ -1,29 +1,68 @@
 /**
- * USER_JOURNEYS.md §8 — search and filter chips. Asserts the OR / AND
- * combination rules described in the journey.
+ * USER_JOURNEYS.md §8 — grid-view search & filter chips. Verifies the OR / AND
+ * combination rules end-to-end by seeding uploads with known captions/uploaders,
+ * activating chips, and counting the resulting grid tiles.
  *
- * Most of this test currently drives the UI; the data-seeding happens
- * via API once a Node-side upload helper lands. For now we ship the
- * structure and the UI assertions, marked with `test.fixme` where they
- * depend on seeded data we can't yet create.
+ * (The pure combination logic is also unit-tested in
+ * frontend/src/lib/feed-filter.test.ts.)
  */
 import { test, expect } from '../../fixtures/test';
+import { seedUpload } from '../../helpers/seed';
+import type { Page } from '@playwright/test';
+
+/** Grid tiles render as buttons labelled "Upload anzeigen". */
+const tiles = (page: Page) => page.getByRole('button', { name: 'Upload anzeigen' });
+
+async function switchToGrid(page: Page) {
+  await page.getByRole('button', { name: 'Rasteransicht' }).click();
+}
+
+/** Type a query into the grid search box and click the matching suggestion. */
+async function addFilter(page: Page, query: string, suggestionName: string | RegExp) {
+  const search = page.getByPlaceholder('Nutzer oder #Tag suchen…');
+  await search.click();
+  await search.fill(query);
+  await page.getByRole('button', { name: suggestionName }).click();
+}
 
 test.describe('Feed — filter & search', () => {
-  test.fixme('two hashtag chips combine with OR', async ({ page, guest, signIn }) => {
-    const h = await guest('Searcher');
-    await signIn(page, h);
-    // TODO: seed 2 uploads with different hashtags, then activate two chips
-    // and assert both cards remain visible.
-    await page.goto('/feed');
-    expect(true).toBe(true);
+  test('two hashtag chips combine with OR', async ({ page, guest, signIn }) => {
+    const a = await guest('OrUser');
+    await seedUpload(a.jwt, { caption: 'pic #wedding' });
+    await seedUpload(a.jwt, { caption: 'pic #party' });
+    await seedUpload(a.jwt, { caption: 'pic #other' });
+
+    await signIn(page, a); // lands on /feed
+    await switchToGrid(page);
+    await expect(tiles(page)).toHaveCount(3);
+
+    // One tag → only its card.
+    await addFilter(page, '#wedding', /wedding/i);
+    await expect(tiles(page)).toHaveCount(1);
+
+    // Adding a second tag widens the result (OR), not narrows it.
+    await addFilter(page, '#party', /party/i);
+    await expect(tiles(page)).toHaveCount(2);
   });
 
-  test.fixme('uploader chip + hashtag chip combines with AND', async ({ page, guest, signIn }) => {
-    const h = await guest('Searcher2');
-    await signIn(page, h);
-    await page.goto('/feed');
-    expect(true).toBe(true);
+  test('uploader chip + hashtag chip combines with AND', async ({ page, guest, signIn }) => {
+    const alice = await guest('AndAlice');
+    const bob = await guest('AndBob');
+    await seedUpload(alice.jwt, { caption: 'pic #wedding' }); // Alice + wedding
+    await seedUpload(bob.jwt, { caption: 'pic #wedding' }); //   Bob   + wedding
+    await seedUpload(alice.jwt, { caption: 'pic #party' }); //   Alice + party
+
+    await signIn(page, alice); // feed is event-wide → sees all three
+    await switchToGrid(page);
+    await expect(tiles(page)).toHaveCount(3);
+
+    // Filter by uploader → Alice's two uploads.
+    await addFilter(page, 'AndAlice', 'AndAlice');
+    await expect(tiles(page)).toHaveCount(2);
+
+    // Add a tag → must satisfy BOTH (Alice AND #wedding) → just the one.
+    await addFilter(page, '#wedding', /wedding/i);
+    await expect(tiles(page)).toHaveCount(1);
   });
 
   test('feed page renders without crashing for an authed user', async ({ page, guest, signIn }) => {

e2e/specs/03-feed/like-comment.spec.ts

@@ -1,36 +1,80 @@
 /**
- * USER_JOURNEYS.md §7 — liking and commenting. SSE round-trip is
- * asserted by opening a second tab as a different user.
+ * USER_JOURNEYS.md §7 — liking and commenting.
+ *
+ * Like behavior is asserted deterministically via the feed snapshot; the comment
+ * SSE round-trip is asserted by subscribing to the stream as a second user and
+ * waiting for the `new-comment` event to arrive.
  */
 import { test, expect } from '../../fixtures/test';
 import { SseListener } from '../../helpers/sse-listener';
+import { seedUpload, seedComment, findFeedRow } from '../../helpers/seed';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+async function like(jwt: string, uploadId: string): Promise<number> {
+  const res = await fetch(`${BASE}/api/v1/upload/${uploadId}/like`, {
+    method: 'POST',
+    headers: { Authorization: `Bearer ${jwt}` },
+  });
+  return res.status;
+}
 
 test.describe('Feed — like + comment', () => {
-  test('like is idempotent against rapid double-click', async ({ api, guest }) => {
-    const a = await guest('Liker');
-    // Seed an upload from a second user so `a` has something to like.
-    const b = await guest('Author');
-    // Without a multipart helper in Node, we exercise the like endpoint directly
-    // and assert behavior via the public feed snapshot.
-    // (Spec is a placeholder until we add a Node-side upload helper or do
-    // the seed via UI.)
-    const feed = await api.getFeed(a.jwt);
-    void feed;
-    void b;
+  test('a like counts once per user and toggles off on repeat (no double-count)', async ({ api, guest }) => {
+    const author = await guest('Author');
+    const liker = await guest('Liker');
+    const uploadId = await seedUpload(author.jwt);
+
+    // Baseline: nobody has liked yet.
+    let row = findFeedRow(await api.getFeed(liker.jwt), uploadId);
+    expect(row.like_count).toBe(0);
+    expect(row.liked_by_me).toBe(false);
+
+    // First like → counted exactly once.
+    expect(await like(liker.jwt, uploadId)).toBe(200);
+    row = findFeedRow(await api.getFeed(liker.jwt), uploadId);
+    expect(row.like_count).toBe(1);
+    expect(row.liked_by_me).toBe(true);
+
+    // Liking again is a toggle → back to zero (guards against a regression that
+    // double-counts a repeated like instead of removing it).
+    expect(await like(liker.jwt, uploadId)).toBe(200);
+    row = findFeedRow(await api.getFeed(liker.jwt), uploadId);
+    expect(row.like_count).toBe(0);
+    expect(row.liked_by_me).toBe(false);
+
+    // A second distinct user's like is counted independently (per-user semantics).
+    expect(await like(liker.jwt, uploadId)).toBe(200); // liker likes again → 1
+    expect(await like(author.jwt, uploadId)).toBe(200); // author likes too → 2
+    row = findFeedRow(await api.getFeed(liker.jwt), uploadId);
+    expect(row.like_count).toBe(2);
   });
 
   test('comment by user A → SSE new-comment delivered to user B', async ({ guest }) => {
-    const a = await guest('A');
-    const b = await guest('B');
+    // SSE frames can take a keep-alive tick to flush through the reverse proxy, so
+    // both the stream connect and the delivery may cost up to ~30s each.
+    test.setTimeout(120_000);
+    const a = await guest('CommenterA');
+    const b = await guest('ListenerB');
 
+    // B subscribes to the stream BEFORE A comments, so the broadcast is captured.
     const sse = new SseListener();
     await sse.start(b.jwt);
 
-    // Without an upload helper, this currently only verifies that the SSE stream
-    // *connects* for a guest. The comment send + receive assertion lands as soon
-    // as we add a backend-side helper to inject uploads bypassing multipart.
-    expect(sse.allEvents().length).toBeGreaterThanOrEqual(0);
-    sse.stop();
-    void a;
+    try {
+      const uploadId = await seedUpload(a.jwt, { caption: 'pic' });
+      await seedComment(a.jwt, uploadId, 'hello from A');
+
+      // B must receive the new-comment event for this upload. Generous timeout: SSE
+      // frames flush on the keep-alive tick through the compressing reverse proxy.
+      const evt = await sse.waitForEvent(
+        'new-comment',
+        (e) => e.data?.upload_id === uploadId,
+        45_000
+      );
+      expect(evt.data.comment_count).toBe(1);
+    } finally {
+      sse.stop();
+    }
   });
 });

e2e/specs/03-feed/sse-realtime.spec.ts

@@ -1,27 +1,49 @@
 /**
  * SSE reconnection after tab background. USER_JOURNEYS.md §17 / edge cases.
+ *
+ * The app closes the EventSource on `document.hidden` and reopens it (minting a
+ * fresh ticket + new EventSource) when the tab becomes visible again — see
+ * frontend/src/lib/sse.ts. We assert the reconnect by counting stream-open
+ * requests rather than event delivery, which keeps the test fast and independent
+ * of the reverse proxy's SSE buffering.
  */
 import { test, expect } from '../../fixtures/test';
+import { trackStreamOpens } from '../../helpers/sse';
 
 test.describe('Feed — SSE behavior', () => {
-  test('SSE reconnects after tab visibility goes hidden then visible', async ({ page, guest, signIn }) => {
-    const h = await guest('SseReconnect');
-    await signIn(page, h);
-    await page.goto('/feed');
+  test('backgrounding then foregrounding the tab opens a fresh SSE connection', async ({ page, guest, signIn }) => {
+    const g = await guest('SseReconnect');
+    const streamOpens = trackStreamOpens(page);
 
-    // Force-fire a visibilitychange to hidden, then back to visible. The app's
-    // sse.ts is expected to close + reopen the EventSource around this.
+    await signIn(page, g); // lands on /feed, which calls connectSse() on mount
+    // Initial connection established.
+    await expect.poll(streamOpens, { timeout: 10_000 }).toBeGreaterThanOrEqual(1);
+
+    // Background: the visibility handler reads document.hidden, so override that
+    // (not just visibilityState) before dispatching, or the close never fires.
+    // disconnectSse() closes the EventSource and clears any reconnect timer, so no
+    // new stream opens while hidden.
     await page.evaluate(() => {
-      Object.defineProperty(document, 'visibilityState', { configurable: true, value: 'hidden' });
+      Object.defineProperty(document, 'hidden', { configurable: true, get: () => true });
+      Object.defineProperty(document, 'visibilityState', { configurable: true, get: () => 'hidden' });
       document.dispatchEvent(new Event('visibilitychange'));
     });
-    await page.waitForTimeout(500);
+    // Snapshot the count AFTER backgrounding — this baselines out the initial open (and
+    // any spurious native/error reconnect before now), so the assertion below can only
+    // be satisfied by a NEW open attributable to the foreground event itself.
+    const afterHidden = streamOpens();
+
+    // Foreground again → connectSse() mints a new ticket and opens a new EventSource.
     await page.evaluate(() => {
-      Object.defineProperty(document, 'visibilityState', { configurable: true, value: 'visible' });
+      Object.defineProperty(document, 'hidden', { configurable: true, get: () => false });
+      Object.defineProperty(document, 'visibilityState', { configurable: true, get: () => 'visible' });
       document.dispatchEvent(new Event('visibilitychange'));
     });
 
-    // App should still be functional — assert the bottom nav remains visible.
+    // The reconnect is a brand-new stream GET that appears only after foregrounding.
+    await expect.poll(streamOpens, { timeout: 10_000 }).toBeGreaterThan(afterHidden);
+
+    // And the app is still functional.
     await expect(page.getByRole('link', { name: 'Galerie' })).toBeVisible();
   });
 });

e2e/specs/03-feed/toast-on-failure.spec.ts

@@ -41,8 +41,9 @@ test.describe('Feed — error toast on user action failures', () => {
     const card = page.locator('article').filter({ hasText: author.displayName }).first();
     await expect(card).toBeVisible({ timeout: 10_000 });
 
-    // Click the like button in the actions row — first visible match inside the card.
-    await card.locator('button').filter({ hasText: /\d+/ }).first().click();
+    // Click the like button by its stable aria-label (the liker hasn't liked yet).
+    // Avoids matching a different digit-bearing button (e.g. the comment count).
+    await card.getByRole('button', { name: 'Gefällt mir' }).click();
 
     // The toast is rendered inside the global Toaster region with aria-live="polite".
     const toast = page.getByTestId('toast').first();

e2e/specs/04-host/event-lock.spec.ts

@@ -33,4 +33,49 @@ test.describe('Host — event lock', () => {
     // Currently no UI consumes the event-closed SSE on /feed. Add this banner
     // and flip fixme to test once it lands.
   });
+
+  // Locking is uploads-only: likes, comments and browsing stay open on a closed
+  // event (USER_JOURNEYS §9.3, FEATURES capability matrix). Only new uploads are
+  // rejected. (An earlier revision froze social interaction too; that contradicted
+  // the documented behavior and was reverted.)
+  test('a closed event still allows likes and comments, but blocks new uploads', async ({ api, host, guest }) => {
+    const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+    const g = await guest('SocialLocked');
+
+    // Upload while still open so there's a target to interact with.
+    const { uploadRaw } = await import('../../helpers/upload-client');
+    const { readFileSync } = await import('node:fs');
+    const { join } = await import('node:path');
+    const sample = join(process.cwd(), 'fixtures', 'media', 'sample.jpg');
+    const upRes = await uploadRaw(g.jwt, readFileSync(sample), {
+      filename: 'x.jpg',
+      contentType: 'image/jpeg',
+    });
+    expect(upRes.status).toBe(201);
+    const { id } = await upRes.json();
+
+    await api.closeEvent(host.jwt);
+
+    // Likes stay open on a locked event.
+    const likeRes = await fetch(`${BASE}/api/v1/upload/${id}/like`, {
+      method: 'POST',
+      headers: { Authorization: `Bearer ${g.jwt}` },
+    });
+    expect(likeRes.status).toBe(200);
+
+    // Comments stay open on a locked event.
+    const commentRes = await fetch(`${BASE}/api/v1/upload/${id}/comments`, {
+      method: 'POST',
+      headers: { Authorization: `Bearer ${g.jwt}`, 'Content-Type': 'application/json' },
+      body: JSON.stringify({ body: 'darf durchgehen' }),
+    });
+    expect(commentRes.status).toBe(201);
+
+    // New uploads, however, are rejected while locked.
+    const blockedUpload = await uploadRaw(g.jwt, readFileSync(sample), {
+      filename: 'y.jpg',
+      contentType: 'image/jpeg',
+    });
+    expect(blockedUpload.status).toBe(403);
+  });
 });

e2e/specs/04-host/moderation.spec.ts

@@ -4,6 +4,7 @@
  * coverage of the buttons lives in a separate UI-focused spec.
  */
 import { test, expect } from '../../fixtures/test';
+import { seedUpload, seedComment } from '../../helpers/seed';
 
 test.describe('Host — moderation API', () => {
   test('ban with hide_uploads=true sets the right flags', async ({ api, host, guest }) => {
@@ -15,13 +16,15 @@ test.describe('Host — moderation API', () => {
     expect(row?.uploads_hidden).toBe(true);
   });
 
-  test('ban without hiding leaves uploads_hidden=false', async ({ api, host, guest }) => {
+  test('ban always hides — the hide_uploads flag is ignored (USER_JOURNEYS §10.5)', async ({ api, host, guest }) => {
+    // Ban is now unconditionally a hide: even asking NOT to hide still hides, because a
+    // banned user's content is "gone" everywhere. The legacy hide_uploads arg is ignored.
     const target = await guest('Banned2');
     await api.banUser(host.jwt, target.userId, false);
     const users = await api.listUsers(host.jwt);
     const row = users.find((u: any) => u.id === target.userId);
     expect(row?.is_banned).toBe(true);
-    expect(row?.uploads_hidden).toBe(false);
+    expect(row?.uploads_hidden).toBe(true);
   });
 
   test('banned user cannot call /upload', async ({ api, host, guest }) => {
@@ -45,3 +48,112 @@ test.describe('Host — moderation API', () => {
     expect(row?.role).toBe('host');
   });
 });
+
+/**
+ * Regression for the review's H1: role & ban used to be trusted from the JWT and
+ * never re-checked against the DB, so a demoted/banned host kept full powers for
+ * the life of their token (up to 30d) and a banned host could even unban
+ * themselves. The auth extractor now re-reads the live user row, so these take
+ * effect on the *existing* session with no re-login.
+ */
+test.describe('Host — live role/ban revocation (H1)', () => {
+  test('a demoted host loses host powers on their existing session', async ({
+    api,
+    adminToken,
+    guest,
+  }) => {
+    const u = await guest('DemoteMidSession');
+    await api.setRole(adminToken, u.userId, 'host');
+    // Fresh host token (role is encoded at mint time).
+    const { body } = await api.recover(u.displayName, u.pin);
+    const hostJwt = body.jwt;
+
+    // Sanity: the token currently has host powers.
+    await api.listUsers(hostJwt);
+
+    // Demote via admin — the host does NOT re-login.
+    await api.setRole(adminToken, u.userId, 'guest');
+
+    // Same token is now rejected with exactly 403 (RequireHost sees the DB role,
+    // not the JWT claim). Asserting the status guards against a spurious 500
+    // masquerading as "revoked".
+    await expect(api.listUsers(hostJwt)).rejects.toThrow(/→ 403/);
+  });
+
+  test('a banned host is locked out immediately on their existing session', async ({
+    api,
+    adminToken,
+    host,
+  }) => {
+    // Sanity: host token works.
+    await api.listUsers(host.jwt);
+
+    await api.banUser(adminToken, host.userId, false);
+
+    // Banned users are rejected with 403 by the auth extractor before any handler runs.
+    await expect(api.listUsers(host.jwt)).rejects.toThrow(/→ 403/);
+  });
+
+  test('a banned host cannot unban themselves', async ({ api, adminToken, host }) => {
+    await api.banUser(adminToken, host.userId, false);
+    await expect(
+      api.unbanUser(host.jwt, host.userId, { expectedStatus: [204] })
+    ).rejects.toThrow(/→ 403/);
+  });
+
+  // H1 / USER_JOURNEYS §10: a banned user keeps *read* access but every write is
+  // rejected with 403. The ban is enforced on write handlers + Require{Host,Admin},
+  // NOT in the base extractor (which would wrongly block reads too).
+  test('a banned user keeps read access but is blocked from writes', async ({ api, host, guest, db }) => {
+    const base = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+    const target = await guest('BannedRW');
+    const auth = (jwt: string) => ({ Authorization: `Bearer ${jwt}` });
+
+    // Seed content the target OWNS *before* the ban, so the delete/edit paths get
+    // past the ownership check and it's genuinely the ban guard being exercised.
+    const ownUpload = await seedUpload(target.jwt, { caption: 'mine' });
+    const ownComment = await seedComment(target.jwt, ownUpload, 'my comment');
+
+    await api.banUser(host.jwt, target.userId, false);
+
+    // Reads still succeed.
+    const read = await fetch(base + '/api/v1/me/context', { headers: auth(target.jwt) });
+    expect(read.status).toBe(200);
+
+    // Every write is rejected — cover ALL guest-reachable mutations, not just
+    // /upload. delete_upload / delete_comment / edit_upload previously skipped the
+    // ban guard (a banned owner could still delete/edit their own content).
+    const create = await fetch(base + '/api/v1/upload', {
+      method: 'POST',
+      headers: auth(target.jwt),
+      body: new FormData(),
+    });
+    expect(create.status).toBe(403);
+
+    const delUpload = await fetch(base + `/api/v1/upload/${ownUpload}`, {
+      method: 'DELETE',
+      headers: auth(target.jwt),
+    });
+    expect(delUpload.status).toBe(403);
+
+    const editUpload = await fetch(base + `/api/v1/upload/${ownUpload}`, {
+      method: 'PATCH',
+      headers: { ...auth(target.jwt), 'Content-Type': 'application/json' },
+      body: JSON.stringify({ caption: 'edited while banned' }),
+    });
+    expect(editUpload.status).toBe(403);
+
+    const delComment = await fetch(base + `/api/v1/comment/${ownComment}`, {
+      method: 'DELETE',
+      headers: auth(target.jwt),
+    });
+    expect(delComment.status).toBe(403);
+
+    // The upload survived every blocked write — the delete was rejected, so the row still
+    // exists (deleted_at IS NULL). We check the DB directly rather than the feed: ban now
+    // ALWAYS hides, so a banned user's own upload is (correctly) filtered out of every feed
+    // even though the row is intact. Read access to *other* content is proven by the 200 on
+    // /me/context above.
+    expect(await db.countUploadsForUser(target.userId)).toBe(1);
+  });
+});

e2e/specs/04-host/pin-reset.spec.ts

@@ -0,0 +1,43 @@
+/**
+ * Regression for the review's C1: `reset_user_pin` wrote to a non-existent
+ * column (`pin_failed_attempts` vs the real `failed_pin_attempts`), so the
+ * endpoint 500'd every time and never returned a PIN — the feature had never
+ * worked against a real DB and no test caught it. These specs pin the contract:
+ * a successful reset returns a fresh 4-digit PIN, and the target can recover
+ * with it.
+ */
+import { test, expect } from '../../fixtures/test';
+
+test.describe('Host — reset guest PIN (C1)', () => {
+  test('resetting a guest PIN returns a fresh 4-digit PIN', async ({ api, host, guest }) => {
+    const target = await guest('ResetMe');
+
+    const { status, body } = await api.resetUserPin(host.jwt, target.userId);
+
+    expect(status).toBe(200);
+    expect(body.pin).toMatch(/^\d{4}$/);
+  });
+
+  test('the target can recover with the newly reset PIN (and not the old one)', async ({
+    api,
+    host,
+    guest,
+  }) => {
+    const target = await guest('RecoverWithNewPin');
+
+    const { body } = await api.resetUserPin(host.jwt, target.userId);
+    const newPin = body.pin!;
+
+    // New PIN works.
+    await api.recover(target.displayName, newPin, { expectedStatus: [200] });
+
+    // Old PIN no longer works (overwritten). 401 = wrong PIN.
+    if (target.pin !== newPin) {
+      await api.recover(target.displayName, target.pin, { expectedStatus: [401] });
+    }
+  });
+
+  test('a host cannot reset their own PIN via this endpoint', async ({ api, host }) => {
+    await api.resetUserPin(host.jwt, host.userId, { expectedStatus: [400] });
+  });
+});

e2e/specs/04-host/sse-eviction.spec.ts

@@ -0,0 +1,75 @@
+/**
+ * Regression for the review's H3: self-deleting an upload and banning a user with
+ * hide_uploads mutated visibility server-side but broadcast nothing, so the
+ * content lingered on every other viewer's feed (and the projector diashow) until
+ * a manual reload. Both now emit SSE so clients evict live.
+ */
+import { test, expect } from '../../fixtures/test';
+import { seedUpload } from '../../helpers/seed';
+import { SseListener } from '../../helpers/sse-listener';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+test.describe('Host — live SSE eviction (H3)', () => {
+  test('self-deleting an upload broadcasts upload-deleted', async ({ guest }) => {
+    const g = await guest('SelfDeleter');
+    const uploadId = await seedUpload(g.jwt, { caption: 'delete me' });
+
+    const sse = new SseListener();
+    await sse.start(g.jwt);
+
+    const res = await fetch(`${BASE}/api/v1/upload/${uploadId}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${g.jwt}` },
+    });
+    expect(res.status).toBe(204);
+
+    await sse.waitForEvent(
+      'upload-deleted',
+      (e) => e.data.upload_id === uploadId
+    );
+  });
+
+  test('banning a user with hide_uploads broadcasts user-hidden', async ({
+    api,
+    host,
+    guest,
+  }) => {
+    const target = await guest('HideTarget');
+    await seedUpload(target.jwt, { caption: 'should vanish' });
+
+    const sse = new SseListener();
+    await sse.start(host.jwt);
+
+    await api.banUser(host.jwt, target.userId, true);
+
+    await sse.waitForEvent(
+      'user-hidden',
+      (e) => e.data.user_id === target.userId
+    );
+  });
+
+  // Frontend regression: the broadcasts above are inert if the client never
+  // registers the event name (the KNOWN_EVENTS gap that shipped both eviction
+  // handlers as dead code). Drive a real browser feed and assert LIVE eviction —
+  // this fails if 'user-hidden' is missing from KNOWN_EVENTS, unlike the
+  // backend-only SseListener checks above.
+  test('a hidden user is evicted from an open feed without reload (frontend)', async ({
+    page,
+    api,
+    host,
+    guest,
+    signIn,
+  }) => {
+    const viewer = await guest('LiveEvictViewer');
+    const target = await guest('LiveEvictTarget');
+    await seedUpload(target.jwt, { caption: 'evict-me-live-xyz' });
+
+    await signIn(page, viewer); // lands on the event-wide /feed
+    await expect(page.getByText('evict-me-live-xyz').first()).toBeVisible();
+
+    // Host hides the target — the viewer's feed must drop the card via SSE, no reload.
+    await api.banUser(host.jwt, target.userId, true);
+    await expect(page.getByText('evict-me-live-xyz')).toHaveCount(0, { timeout: 15_000 });
+  });
+});

e2e/specs/05-admin/config.spec.ts

@@ -63,8 +63,10 @@ test.describe('Admin — stats', () => {
     await guest('Stat2');
     await guest('Stat3');
     const stats = await api.getStats(adminToken);
-    // Three guests + the Admin account auto-created on first admin login = 4 users.
-    expect(stats.user_count).toBeGreaterThanOrEqual(3);
+    // Deterministic after the per-test truncate: 3 seeded guests + the Admin account
+    // (recreated by the adminToken fixture's login) = exactly 4. An exact assertion
+    // catches undercount/overcount regressions a `>= 3` lower bound would miss.
+    expect(stats.user_count).toBe(4);
     expect(typeof stats.disk_total_bytes).toBe('number');
   });
 });

e2e/specs/06-export/export-leak.spec.ts

@@ -0,0 +1,60 @@
+/**
+ * Regression for the review's CR2: export archives (Gallery.zip / Memories.zip)
+ * were written under media_path/exports, and /media is a public ServeDir — so
+ * anyone could GET /media/exports/Gallery.zip and download the whole gallery,
+ * bypassing the ticket + export_*_ready gate. Exports now live OUTSIDE media_path
+ * and are reachable only via the gated /api/v1/export/{zip,html} handlers.
+ *
+ * This drives a REAL export (release → job runs → archive on disk) and then
+ * asserts the archive is NOT public but IS gated. Asserting a 404 on an empty
+ * stack would pass even if exports were still under /media (the file just wouldn't
+ * exist yet) — so we produce a real file first, then prove it can't leak.
+ */
+import { test, expect } from '../../fixtures/test';
+import { seedUpload } from '../../helpers/seed';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+test.describe('Export — no public leak (CR2)', () => {
+  test('a real export is downloadable only via the gated endpoint, never via /media', async ({
+    host,
+  }) => {
+    test.setTimeout(60_000);
+    const bearer = { Authorization: `Bearer ${host.jwt}` };
+
+    // Seed content so the archive actually contains a file.
+    await seedUpload(host.jwt, { caption: 'in the export' });
+
+    // Host releases the gallery → spawns the real zip/html export jobs.
+    const rel = await fetch(`${BASE}/api/v1/host/gallery/release`, { method: 'POST', headers: bearer });
+    expect(rel.status).toBe(204);
+
+    // Wait for the real zip job to finish writing the archive to disk.
+    await expect
+      .poll(
+        async () => {
+          const res = await fetch(`${BASE}/api/v1/export/status`, { headers: bearer });
+          return (await res.json()).zip?.status;
+        },
+        { timeout: 45_000, intervals: [500] }
+      )
+      .toBe('done');
+
+    // The archive now EXISTS on disk. It must NOT be reachable via public /media…
+    for (const name of ['Gallery.zip', 'Memories.zip']) {
+      const leak = await fetch(`${BASE}/media/exports/${name}`);
+      // A 200 here = the whole-gallery archive is downloadable with no auth (CR2).
+      expect(leak.status, `${name} must not be served from public /media`).toBe(404);
+    }
+
+    // …but IS retrievable via the gated single-use ticket endpoint. This proves the
+    // 404 above means "not public", not merely "no file was produced".
+    const ticketRes = await fetch(`${BASE}/api/v1/export/ticket`, { method: 'POST', headers: bearer });
+    const { ticket } = await ticketRes.json();
+    const dl = await fetch(`${BASE}/api/v1/export/zip?ticket=${encodeURIComponent(ticket)}`);
+    expect(dl.status).toBe(200);
+    // Real ZIP payload: the archive starts with the PK local-file-header magic.
+    const head = new Uint8Array(await dl.arrayBuffer()).subarray(0, 2);
+    expect(Array.from(head)).toEqual([0x50, 0x4b]); // "PK"
+  });
+});

e2e/specs/06-export/export-video.spec.ts

@@ -0,0 +1,64 @@
+/**
+ * Covers the HTML export's VIDEO path (perf/stability fix P4). The export used to
+ * copy every original — including full-size videos — into a temp dir and then re-read
+ * them into the ZIP (transient 2× disk). It now streams video originals straight from
+ * disk into the archive. The image-only export specs never exercised that branch, so
+ * this drives a real video upload → export → and proves the video entry lands in
+ * Memories.zip (i.e. the streamed-from-original path works and the video isn't dropped).
+ *
+ * The fixture clip is <1s, so ffmpeg extracts no thumbnail frame — but exits 0, so the
+ * compression worker keeps the upload (it isn't auto-cleaned). That's the intended
+ * shape here: the full video is exported even when its thumbnail is absent.
+ */
+import { test, expect } from '../../fixtures/test';
+import { uploadRaw } from '../../helpers/upload-client';
+import { readFileSync } from 'node:fs';
+import { join } from 'node:path';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+test.describe('Export — video streaming (P4)', () => {
+  test('a real video upload is streamed into Memories.zip (not dropped)', async ({ host }) => {
+    test.setTimeout(60_000);
+    const bearer = { Authorization: `Bearer ${host.jwt}` };
+
+    // Seed a real video upload owned by the host.
+    const mp4 = readFileSync(join(process.cwd(), 'fixtures', 'media', 'sample.mp4'));
+    const up = await uploadRaw(host.jwt, mp4, { filename: 'clip.mp4', contentType: 'video/mp4' });
+    expect(up.status).toBe(201);
+    const { id } = await up.json();
+
+    // Release the gallery → spawns the real zip + html export jobs.
+    const rel = await fetch(`${BASE}/api/v1/host/gallery/release`, { method: 'POST', headers: bearer });
+    expect(rel.status).toBe(204);
+
+    // Wait for the HTML (Memories.zip) job — that's the one whose media staging P4 changed.
+    await expect
+      .poll(
+        async () => {
+          const res = await fetch(`${BASE}/api/v1/export/status`, { headers: bearer });
+          return (await res.json()).html?.status;
+        },
+        { timeout: 45_000, intervals: [500] }
+      )
+      .toBe('done');
+
+    // Download Memories.zip via the gated single-use ticket.
+    const ticketRes = await fetch(`${BASE}/api/v1/export/ticket`, { method: 'POST', headers: bearer });
+    const { ticket } = await ticketRes.json();
+    const dl = await fetch(`${BASE}/api/v1/export/html?ticket=${encodeURIComponent(ticket)}`);
+    expect(dl.status).toBe(200);
+
+    const bytes = new Uint8Array(await dl.arrayBuffer());
+    // Valid ZIP (PK local-file-header magic).
+    expect(Array.from(bytes.subarray(0, 2))).toEqual([0x50, 0x4b]);
+
+    // ZIP entry names are stored verbatim (uncompressed) in the archive, so the video's
+    // media entry name appears as plaintext bytes. Its presence means the streamed
+    // video entry was written; if the stream had failed, entry.close() would have
+    // errored and the job would never have reached 'done'.
+    const needle = `media/${id}.mp4`;
+    const haystack = new TextDecoder('latin1').decode(bytes);
+    expect(haystack.includes(needle), `Memories.zip must contain ${needle}`).toBe(true);
+  });
+});

e2e/specs/06-export/export.spec.ts

@@ -42,16 +42,42 @@ test.describe('Export — release and download', () => {
     expect(body.html.status).toBe('done');
   });
 
-  test('ZIP download returns 404 when no file is on disk (export released but never compressed)', async ({ guest, db }) => {
-    const g = await guest('NoFile');
+  const base = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+  // Browser downloads stream to disk via a top-level navigation, so the download
+  // endpoint authenticates with a single-use ticket (no Bearer header).
+  async function mintTicket(jwt: string): Promise<string> {
+    const res = await fetch(base + '/api/v1/export/ticket', {
+      method: 'POST',
+      headers: { Authorization: `Bearer ${jwt}` },
+    });
+    return (await res.json()).ticket;
+  }
+
+  test('ZIP download 404s when the export is not yet marked ready', async ({ guest, db }) => {
+    const g = await guest('NotReady');
+    // Released flag set, but export_zip_ready is still false → must refuse, never serve.
     await db.setExportReleased(SLUG, true);
     await db.fakeExportJob(SLUG, 'zip', 'done');
-    // Real backend additionally checks event.export_zip_ready. The faked row is
-    // enough for /status; the download path needs the boolean flag too.
-    const res = await fetch((process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101') + '/api/v1/export/zip', {
-      headers: { Authorization: `Bearer ${g.jwt}` },
-    });
-    // Either 404 ("not available" OR "file not found") — both are valid states for this setup.
-    expect([404, 200]).toContain(res.status);
+    const ticket = await mintTicket(g.jwt);
+
+    const res = await fetch(base + '/api/v1/export/zip?ticket=' + encodeURIComponent(ticket));
+    // Pinned to 404 (not [404,200]): a 200 here would mean serving an export that was
+    // never released for download — a data-exposure regression. This hits the
+    // `!export_zip_ready` guard.
+    expect(res.status).toBe(404);
+  });
+
+  test('ZIP download 404s when marked ready but the file is missing on disk', async ({ guest, db }) => {
+    const g = await guest('ReadyNoFile');
+    // Released AND ready, but no Gallery.zip on disk (we never ran a real export) →
+    // the handler must 404 on the missing-file check, not 200/500 or serve a stale file.
+    await db.setExportReleased(SLUG, true);
+    await db.setExportZipReady(SLUG, true);
+    await db.fakeExportJob(SLUG, 'zip', 'done');
+    const ticket = await mintTicket(g.jwt);
+
+    const res = await fetch(base + '/api/v1/export/zip?ticket=' + encodeURIComponent(ticket));
+    expect(res.status).toBe(404);
   });
 });

e2e/specs/07-adversarial/authorization-deep.spec.ts

@@ -5,26 +5,79 @@
  * with cross-user and banned-user scenarios that span multiple resources.
  */
 import { test, expect } from '../../fixtures/test';
+import { seedUpload, seedComment, listComments, findFeedRow } from '../../helpers/seed';
 
 const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
 
 test.describe('Adversarial — deep authorization', () => {
-  test('user A cannot delete user B\'s comment via /api/v1/comment/{id}', async ({ api, guest }) => {
-    const a = await guest('CommentA');
-    const b = await guest('CommentB');
+  // IDOR: user B must not be able to delete user A's REAL comment. This exercises the
+  // ownership guard (`comment.user_id != auth.user_id` → 403) — the previous version fired
+  // at the all-zeros UUID, which 404s at the lookup BEFORE that guard runs, so it never
+  // tested authorization at all.
+  test('user B cannot delete user A\'s comment (real resource → 403, comment survives)', async ({ guest }) => {
+    const a = await guest('CommentOwnerA');
+    const b = await guest('AttackerB');
 
-    // We need an upload first; without a multipart helper here we use a placeholder:
-    // post a comment on a non-existent upload to force the path to return 404 / 403 / 401.
-    // The real intent is verified once an upload helper feeds this test a real upload_id.
-    const fakeId = '00000000-0000-0000-0000-000000000000';
-    const res = await fetch(`${BASE}/api/v1/comment/${fakeId}`, {
+    const uploadId = await seedUpload(a.jwt);
+    const commentId = await seedComment(a.jwt, uploadId, 'A owns this');
+
+    const res = await fetch(`${BASE}/api/v1/comment/${commentId}`, {
       method: 'DELETE',
       headers: { Authorization: `Bearer ${b.jwt}` },
     });
-    // Acceptable: 403 (not your comment), 404 (no such comment), 401.
-    expect([401, 403, 404]).toContain(res.status);
-    void a;
-    void api;
+    // Must be 403 specifically — the comment exists and is in B's event, so a 404 would
+    // mean the ownership check was skipped/reordered.
+    expect(res.status).toBe(403);
+
+    // No state change: the comment is still there.
+    const after = await listComments(a.jwt, uploadId);
+    expect(after.some((c: any) => c.id === commentId)).toBe(true);
+
+    // Control: the real owner CAN delete it (proves the 403 was about identity, not a broken route).
+    const ownerDel = await fetch(`${BASE}/api/v1/comment/${commentId}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${a.jwt}` },
+    });
+    expect(ownerDel.status).toBe(204);
+  });
+
+  // IDOR: user B must not be able to delete user A's REAL upload.
+  test('user B cannot delete user A\'s upload (403, upload survives)', async ({ guest, db }) => {
+    const a = await guest('UploadOwnerA');
+    const b = await guest('AttackerB2');
+
+    const uploadId = await seedUpload(a.jwt);
+    expect(await db.countUploadsForUser(a.userId)).toBe(1);
+
+    const res = await fetch(`${BASE}/api/v1/upload/${uploadId}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${b.jwt}` },
+    });
+    expect(res.status).toBe(403);
+
+    // No state change: A's upload is still present (not soft-deleted).
+    expect(await db.countUploadsForUser(a.userId)).toBe(1);
+  });
+
+  // IDOR: user B must not be able to edit (re-caption / re-tag) user A's upload.
+  test('user B cannot edit user A\'s upload caption (403, caption unchanged)', async ({ guest }) => {
+    const a = await guest('UploadOwnerA2');
+    const b = await guest('AttackerB3');
+
+    // seedUpload marks compression done, so the upload is feed-visible for the read-back.
+    const uploadId = await seedUpload(a.jwt, { caption: 'original caption' });
+
+    const res = await fetch(`${BASE}/api/v1/upload/${uploadId}`, {
+      method: 'PATCH',
+      headers: { Authorization: `Bearer ${b.jwt}`, 'Content-Type': 'application/json' },
+      body: JSON.stringify({ caption: 'hacked by B' }),
+    });
+    expect(res.status).toBe(403);
+
+    // No state change: the caption A set is intact.
+    const feedRes = await fetch(`${BASE}/api/v1/feed`, { headers: { Authorization: `Bearer ${a.jwt}` } });
+    const row = findFeedRow(await feedRes.json(), uploadId);
+    expect(row?.caption).toBe('original caption');
   });
 
   test('banned user cannot toggle a like', async ({ api, host, guest }) => {

e2e/specs/07-adversarial/ddos.spec.ts

@@ -4,6 +4,7 @@
  * or rejected gracefully without crashing the backend.
  */
 import { test, expect } from '../../fixtures/test';
+import { mintSseTicket } from '../../helpers/sse';
 
 const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
 
@@ -46,9 +47,15 @@ test.describe('Adversarial — small-scale abuse', () => {
 
   test('SSE: 10 concurrent streams from one user do not crash the server', async ({ guest }) => {
     const g = await guest('SseFlood');
-    const controllers = Array.from({ length: 10 }, () => new AbortController());
-    const requests = controllers.map((c) =>
-      fetch(`${BASE}/api/v1/stream?token=${encodeURIComponent(g.jwt)}`, { signal: c.signal })
+    // The stream endpoint authenticates via single-use tickets (POST /stream/ticket),
+    // not the raw JWT — a `?token=` open is rejected with 400. Mint one ticket per stream.
+    // (These streams must be held open concurrently, so we can't use the openStream
+    // helper which opens-and-aborts a single stream.)
+    const tickets = await Promise.all(Array.from({ length: 10 }, () => mintSseTicket(g.jwt)));
+
+    const controllers = tickets.map(() => new AbortController());
+    const requests = tickets.map((ticket, i) =>
+      fetch(`${BASE}/api/v1/stream?ticket=${encodeURIComponent(ticket)}`, { signal: controllers[i].signal })
     );
     const responses = await Promise.all(requests);
     // All accepted (or some rate-limited — both fine).

e2e/specs/07-adversarial/media-gating.spec.ts

@@ -0,0 +1,59 @@
+/**
+ * Security fix F2: preview/thumbnail images are now served through a visibility-checked
+ * alias (/api/v1/upload/{id}/preview) instead of the unauthenticated /media ServeDir,
+ * so moderation (delete / ban-hide) actually revokes access to the displayed image —
+ * not just the full-res original. Direct /media/previews access is blocked.
+ */
+import { test, expect } from '../../fixtures/test';
+import { seedUpload } from '../../helpers/seed';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+test.describe('Media gating — moderation revokes preview access (F2)', () => {
+  test('preview served via gated alias, blocked directly, and 404 after delete', async ({
+    host,
+    api,
+  }) => {
+    test.setTimeout(30_000);
+    const id = await seedUpload(host.jwt, { caption: 'gated' });
+
+    // Wait for the compression worker to produce the preview — the feed exposes
+    // `preview_url` only once `preview_path` is set.
+    let previewUrl: string | undefined;
+    await expect
+      .poll(
+        async () => {
+          const feed = await api.getFeed(host.jwt);
+          const row = (feed.uploads ?? []).find((u: any) => u.id === id);
+          previewUrl = row?.preview_url ?? undefined;
+          return previewUrl;
+        },
+        { timeout: 20_000, intervals: [500] }
+      )
+      .toBeTruthy();
+
+    // Feed now emits the gated alias, not a /media path.
+    expect(previewUrl).toBe(`/api/v1/upload/${id}/preview`);
+
+    // The gated alias serves the image with the app-layer nosniff header.
+    const ok = await fetch(`${BASE}${previewUrl}`);
+    expect(ok.status).toBe(200);
+    expect(ok.headers.get('content-type')).toContain('image/jpeg');
+    // App sets nosniff (F6); the edge proxy may also set it → value can be doubled.
+    expect(ok.headers.get('x-content-type-options')).toContain('nosniff');
+
+    // Direct /media access is blocked (404) — the alias is the only way in.
+    const direct = await fetch(`${BASE}/media/previews/${id}.jpg`);
+    expect(direct.status, 'direct /media/previews must be blocked').toBe(404);
+
+    // Host deletes the upload → the preview must stop being served.
+    const del = await fetch(`${BASE}/api/v1/host/upload/${id}`, {
+      method: 'DELETE',
+      headers: { Authorization: `Bearer ${host.jwt}` },
+    });
+    expect(del.status).toBe(204);
+
+    const afterDelete = await fetch(`${BASE}/api/v1/upload/${id}/preview`);
+    expect(afterDelete.status, 'moderation must revoke preview access').toBe(404);
+  });
+});

e2e/specs/07-adversarial/set-role-host-demote.spec.ts

@@ -0,0 +1,45 @@
+/**
+ * Security fix F1: a plain host must not be able to demote a *peer host*. Before the
+ * fix, `set_role` only blocked `target == admin`, so a host could demote another host
+ * to guest and then ban / PIN-reset (→ account takeover via /recover) them, because the
+ * ban/pin-reset peer guards key off the target's *current* role. This proves the
+ * demotion itself is now blocked for non-admins, while admins and guest-management
+ * still work.
+ */
+import { test, expect } from '../../fixtures/test';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+function patchRole(token: string, userId: string, role: string) {
+  return fetch(`${BASE}/api/v1/host/users/${userId}/role`, {
+    method: 'PATCH',
+    headers: { Authorization: `Bearer ${token}`, 'Content-Type': 'application/json' },
+    body: JSON.stringify({ role }),
+  });
+}
+
+test.describe('AuthZ — host cannot demote a peer host (F1)', () => {
+  test('host→host demotion is 403; admin may demote; host may still manage guests', async ({
+    host,
+    guest,
+    adminToken,
+    api,
+  }) => {
+    // A second host (the victim) and an ordinary guest.
+    const peer = await guest('PeerHost');
+    await api.setRole(adminToken, peer.userId, 'host');
+    const plain = await guest('PlainGuest');
+
+    // Attacker host tries to demote the peer host — must be refused.
+    const attack = await patchRole(host.jwt, peer.userId, 'guest');
+    expect(attack.status, 'a host must not be able to demote a peer host').toBe(403);
+
+    // An admin may still demote a host.
+    const byAdmin = await patchRole(adminToken, peer.userId, 'guest');
+    expect(byAdmin.status).toBe(204);
+
+    // A host may still manage guests (promote one to host).
+    const promote = await patchRole(host.jwt, plain.userId, 'host');
+    expect(promote.status).toBe(204);
+  });
+});

e2e/specs/07-adversarial/sse-ticket-abuse.spec.ts

@@ -0,0 +1,40 @@
+/**
+ * Phase 2 adversarial — SSE ticket capability abuse.
+ *
+ * The stream endpoint authenticates via short-lived, single-use tickets minted at
+ * POST /api/v1/stream/ticket (never the raw JWT in the URL). These tests pin the
+ * security properties of that flow: minting requires auth, and a ticket is consumed
+ * on first use so it cannot be replayed.
+ */
+import { test, expect } from '../../fixtures/test';
+import { mintSseTicket, openStream } from '../../helpers/sse';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+
+test.describe('Adversarial — SSE ticket abuse', () => {
+  test('minting a ticket requires authentication', async () => {
+    const res = await fetch(`${BASE}/api/v1/stream/ticket`, { method: 'POST' });
+    expect(res.status).toBe(401);
+  });
+
+  test('a ticket is single-use: replay after first open is rejected', async ({ guest }) => {
+    const g = await guest('SseReplay');
+    const ticket = await mintSseTicket(g.jwt);
+
+    // First open consumes the ticket.
+    expect(await openStream(ticket)).toBe(200);
+
+    // Replaying the exact same ticket must fail — it was consumed, so `consume` returns
+    // None → 401. A 200 here would mean tickets are reusable (capability replay).
+    expect(await openStream(ticket)).toBe(401);
+  });
+
+  test('an unminted / garbage ticket is rejected', async () => {
+    // 24-byte-shaped hex string that was never issued.
+    const bogus = 'deadbeef'.repeat(6);
+    expect(await openStream(bogus)).toBe(401);
+  });
+  // Note: the replay test's first open (→ 200) already proves a freshly-minted ticket
+  // works, so there is no separate "fresh ticket" sanity test — a second successful open
+  // would just add ~30s (SSE headers flush on the keep-alive tick through Caddy).
+});

e2e/specs/08-browser-chaos/multi-tab.spec.ts

@@ -3,18 +3,25 @@
  * browser process.
  */
 import { test, expect } from '../../fixtures/test';
+import { trackStreamOpens } from '../../helpers/sse';
 
 test.describe('Browser chaos — multi-tab', () => {
-  test('same user in two tabs — SSE delivers to both', async ({ page, context, guest, signIn }) => {
+  test('same user in two tabs — each tab establishes its own SSE stream', async ({ page, context, guest, signIn }) => {
     const g = await guest('Twin');
-    await signIn(page, g);
-    await page.goto('/feed');
+
+    // Count each tab's own EventSource open. Asserting *connection establishment* is
+    // fast and reliable; asserting event *delivery* would depend on the reverse proxy's
+    // ~30s SSE buffering and isn't worth the flake here.
+    const opens1 = trackStreamOpens(page);
+    await signIn(page, g); // → /feed, connectSse() on mount
+    await expect.poll(opens1, { timeout: 10_000 }).toBeGreaterThanOrEqual(1);
 
     const tab2 = await context.newPage();
+    const opens2 = trackStreamOpens(tab2);
     await signIn(tab2, g);
-    await tab2.goto('/feed');
+    await expect.poll(opens2, { timeout: 10_000 }).toBeGreaterThanOrEqual(1);
 
-    // Both tabs should mount the bottom nav.
+    // Both tabs mounted and each opened its own independent stream.
     await expect(page.getByRole('link', { name: 'Galerie' })).toBeVisible();
     await expect(tab2.getByRole('link', { name: 'Galerie' })).toBeVisible();
     await tab2.close();

e2e/specs/08-browser-chaos/offline-network.spec.ts

@@ -61,7 +61,10 @@ test.describe('Browser chaos — network', () => {
     const g = await guest('Throttled');
 
     let attempts = 0;
-    await page.route('**/api/v1/feed', async (route) => {
+    // Match /api/v1/feed with or without a query string (the app requests
+    // `/feed?limit=20`), but NOT /api/v1/feed/delta. A plain `**/api/v1/feed` glob
+    // fails to match the query-string URL, so this route never fired before.
+    await page.route(/\/api\/v1\/feed(\?|$)/, async (route) => {
       attempts++;
       await route.fulfill({
         status: 429,
@@ -72,9 +75,29 @@ test.describe('Browser chaos — network', () => {
 
     await signIn(page, g);
     await page.goto('/feed');
-    await page.waitForTimeout(3_000);
+
+    // First make sure the throttled endpoint was actually hit — otherwise the
+    // stabilize-poll below could settle at attempts=0 (feed request not yet fired)
+    // and pass vacuously without ever exercising the 429 path.
+    await expect.poll(() => attempts, { timeout: 8_000 }).toBeGreaterThanOrEqual(1);
+
+    // Then wait until the retry count stops climbing instead of sleeping a fixed 3s:
+    // a well-behaved client surfaces the 429 and stops, so the count settles quickly;
+    // a retry storm would keep incrementing and never stabilize (→ this poll times
+    // out and the test fails, which is the outcome we want).
+    let prev = -1;
+    await expect
+      .poll(
+        () => {
+          const stable = attempts === prev;
+          prev = attempts;
+          return stable;
+        },
+        { timeout: 8_000, intervals: [300] }
+      )
+      .toBe(true);
 
     // Sanity: client did not hammer the endpoint > a few times under throttle.
-    expect(attempts).toBeLessThan(15);
+    expect(attempts, `retry attempts=${attempts}`).toBeLessThan(15);
   });
 });

e2e/specs/09-mobile/gestures-doubletap.spec.ts

@@ -75,10 +75,11 @@ test.describe('Mobile — double-tap gesture', () => {
     await expect(imageButton).toBeVisible({ timeout: 10_000 });
     await imageButton.click();
 
-    // LightboxModal is `role="dialog"` (no aria-modal). The other dialog on the
-    // page is the ContextSheet which has `aria-modal="true"` even when closed,
-    // so scope to NOT-aria-modal to pick the lightbox specifically.
-    const lightbox = page.locator('[role="dialog"]:not([aria-modal])');
+    // LightboxModal is the only dialog labelled by #lightbox-title, so target it
+    // directly. (Closed sheets no longer expose role=dialog — that semantics is
+    // gated on `open` — so a plain [role=dialog] match would be ambiguous only
+    // while a sheet is open; the labelledby scope keeps this unambiguous.)
+    const lightbox = page.locator('[role="dialog"][aria-labelledby="lightbox-title"]');
     await expect(lightbox).toBeVisible();
 
     // Find the inner image element to tap.

e2e/specs/09-mobile/gestures-longpress.spec.ts

@@ -2,7 +2,7 @@
  * Phase 3 mobile — long-press gesture.
  *
  * The `longpress` action attaches to `<article>` in FeedListCard and to
- * grid cells in FeedGrid. Holding for ≥ 500 ms fires `onlongpress`,
+ * grid cells in VirtualFeed (grid mode). Holding for ≥ 500 ms fires `onlongpress`,
  * which opens the ContextSheet bottom sheet via the feed page's
  * `contextTarget` state.
  *
@@ -45,13 +45,11 @@ test.describe('Mobile — long-press gesture', () => {
 
     await longPress(page, card, 600);
 
-    // The ContextSheet renders a dialog with role="dialog" + aria-modal="true".
-    // Multiple sheets (UploadSheet, ContextSheet) may be in the DOM — match the
-    // one that actually has aria-modal=true (i.e. the open one).
-    // ContextSheet is always mounted (it just translates off-screen when closed).
-    // Match the OPEN state by the `translate-y-0` class the component applies
-    // when `open === true`.
-    const sheet = page.locator('[role="dialog"][aria-modal="true"].translate-y-0');
+    // The ContextSheet is always mounted (it translates off-screen when closed).
+    // Target it by its stable data-testid, gated on aria-modal="true" which the
+    // component sets only while open — unambiguous vs. the centered LightboxModal
+    // (which also has aria-modal) and independent of the animation classes.
+    const sheet = page.locator('[data-testid="context-sheet"][aria-modal="true"]');
     await expect(sheet).toBeVisible({ timeout: 2_000 });
     await expect(sheet.getByRole('button', { name: /abbrechen/i })).toBeVisible();
   });
@@ -68,10 +66,9 @@ test.describe('Mobile — long-press gesture', () => {
     // Simulate a short press (200 ms — well under the 500 ms threshold).
     await longPress(page, card, 200);
 
-    // Within 1 s, no aria-modal=true dialog should be open (the ContextSheet
-    // is "open" only when its aria-modal flag is true).
-    // The ContextSheet stays mounted but `translate-y-0` is only set when open.
-    await expect(page.locator('[role="dialog"][aria-modal="true"].translate-y-0')).toHaveCount(0, { timeout: 1_000 });
+    // Within 1 s, the ContextSheet must not be open (aria-modal is set only when
+    // open). A quick tap opens the lightbox instead, which is a different element.
+    await expect(page.locator('[data-testid="context-sheet"][aria-modal="true"]')).toHaveCount(0, { timeout: 1_000 });
   });
 
   test('long-press suppresses the click that lands at pointerup (no double-open of lightbox)', async ({ page, guest, signIn }) => {

e2e/specs/09-mobile/safe-area.spec.ts

@@ -45,20 +45,8 @@ test.describe('Mobile — safe-area insets', () => {
     expect(distanceFromBottom).toBeLessThanOrEqual(2);
   });
 
-  test('context sheet (when opened) carries the same safe-area declaration', async ({ page }) => {
-    // We can't easily open the context sheet without a feed card to long-press,
-    // but the markup lives in the layout once the route mounts. We probe by
-    // scanning every element with a `style` attribute for the env() reference.
-    await page.goto('/join');
-    const candidateStyles: string[] = await page.evaluate(() => {
-      return Array.from(document.querySelectorAll<HTMLElement>('[style]'))
-        .map((el) => el.getAttribute('style') ?? '')
-        .filter((s) => s.includes('env(safe-area-inset-bottom)'));
-    });
-    // On /join there may be zero — the assertion is more of a sanity check.
-    // On /feed and /account it would be ≥ 1. We assert that on /feed below.
-    expect(Array.isArray(candidateStyles)).toBe(true);
-  });
+  // (A vacuous `/join` probe that only asserted `Array.isArray(...)` — always true —
+  // was removed; the real sheet-level env() check is the structural test below.)
 
   test('upload sheet and context sheet both honor env() (structural check)', async ({ page, guest, signIn }) => {
     const g = await guest('SafeAreaSheets');

e2e/specs/09-mobile/sheet-escape.spec.ts

@@ -12,7 +12,9 @@ test.describe('Mobile a11y — sheets dismiss on Escape', () => {
     await page.goto('/account');
 
     // Click the "Original" radio in the Datennutzung section to open the warning sheet.
-    const originalRadio = page.getByRole('radio', { name: /Original$/i });
+    // The radio's accessible name is its title + description ("Original Lädt die
+    // Originaldateien…"), so anchor on the start, not the end.
+    const originalRadio = page.getByRole('radio', { name: /^Original/i });
     await originalRadio.click();
 
     const sheet = page.locator('[role="dialog"][aria-labelledby="data-mode-title"]');

e2e/specs/10-flow-review/export-reopen-rerelease.spec.ts

@@ -0,0 +1,198 @@
+/**
+ * Re-review regression guard — Chain #2 ("export corruption on reopen→re-release").
+ *
+ * Bug that was fixed: `spawn_export_jobs` ran the worker unconditionally and the
+ * worker wrote a FIXED temp path (`Gallery.zip.tmp` / `viewer_tmp_{event}`).
+ * The new reopen→re-release flow could therefore spawn a second worker while the
+ * first was still running — two workers stomping the same temp file → a corrupt
+ * keepsake ZIP served to guests.
+ *
+ * The fix: `claim_job` is an atomic `UPDATE ... WHERE status='pending'`; a worker
+ * that doesn't win the claim bails without touching the temp file. The re-enqueue
+ * `ON CONFLICT DO UPDATE ... WHERE status <> 'running'` leaves an in-flight job
+ * alone. Net: exactly one worker per (event,type).
+ *
+ * This test seeds real uploads, releases, then churns reopen→re-release (stressing
+ * the claim guard), waits for the export to settle, and asserts the produced ZIP is
+ * INTACT (passes `unzip -t`) with exactly one entry per upload — plus that no
+ * export_job row is left stuck `running`. A temp-file race would corrupt/truncate
+ * the archive or drop entries, failing these assertions.
+ *
+ * Note on scope: a Dockerised export over small fixtures completes in well under a
+ * second, so this cannot *deterministically* force two workers to overlap in time.
+ * It stresses the claim/ON-CONFLICT guard under rapid churn and hard-checks archive
+ * integrity; the atomic single-worker guarantee itself is additionally proven by
+ * code review + SQL PREPARE. Together they cover the regression.
+ */
+import { test, expect } from '../../fixtures/test';
+import { Client } from 'pg';
+import { execFileSync } from 'node:child_process';
+import { writeFileSync, mkdtempSync } from 'node:fs';
+import { tmpdir } from 'node:os';
+import { join } from 'node:path';
+import { seedUpload } from '../../helpers/seed';
+
+const BASE = process.env.E2E_FRONTEND_URL ?? 'http://localhost:3101';
+const SLUG = 'e2e-test-event';
+const N_UPLOADS = 6;
+
+const PG = {
+  host: process.env.E2E_DB_HOST ?? 'localhost',
+  port: Number(process.env.E2E_DB_PORT ?? '55432'),
+  user: process.env.E2E_DB_USER ?? 'eventsnap_test',
+  password: process.env.E2E_DB_PASSWORD ?? 'eventsnap_test',
+  database: process.env.E2E_DB_NAME ?? 'eventsnap_test',
+};
+
+async function pgQuery<T = any>(sql: string): Promise<T[]> {
+  const c = new Client(PG);
+  await c.connect();
+  try {
+    return (await c.query(sql)).rows as T[];
+  } finally {
+    await c.end();
+  }
+}
+
+function post(path: string, jwt: string) {
+  return fetch(BASE + path, { method: 'POST', headers: { Authorization: `Bearer ${jwt}` } });
+}
+
+async function exportStatus(jwt: string): Promise<any> {
+  const res = await fetch(BASE + '/api/v1/export/status', { headers: { Authorization: `Bearer ${jwt}` } });
+  return res.json();
+}
+
+async function mintTicket(jwt: string): Promise<string> {
+  const res = await post('/api/v1/export/ticket', jwt);
+  return (await res.json()).ticket;
+}
+
+test.describe('Flow re-review — reopen→re-release export integrity (#2)', () => {
+  // The real export job runs image processing; give it head-room over the tiny fixtures.
+  test.setTimeout(90_000);
+
+  test('rapid release/reopen/re-release yields exactly one INTACT ZIP and no stuck jobs', async ({
+    host,
+  }) => {
+    // Seed real, decodable uploads while the event is open.
+    for (let i = 0; i < N_UPLOADS; i++) {
+      await seedUpload(host.jwt, { caption: `pic ${i}` });
+    }
+
+    // First release → export starts and uploads lock (release ⇒ lock).
+    expect((await post('/api/v1/host/gallery/release', host.jwt)).status).toBe(204);
+
+    // Post-release uploads must be rejected (belt-and-suspenders on top of the lock).
+    const { uploadRaw } = await import('../../helpers/upload-client');
+    const { readFileSync } = await import('node:fs');
+    const rejected = await uploadRaw(host.jwt, readFileSync(join(process.cwd(), 'fixtures', 'media', 'sample.jpg')), {
+      filename: 'late.jpg',
+      contentType: 'image/jpeg',
+    });
+    expect(rejected.status).toBe(403);
+
+    // Churn: reopen (clears release + ready flags) then re-release, several times in
+    // quick succession. This is the path that used to be able to double-spawn workers
+    // over the shared temp file. End on a release so the gallery is left released.
+    for (let i = 0; i < 4; i++) {
+      expect((await post('/api/v1/host/event/open', host.jwt)).status).toBe(204);
+      const rel = await post('/api/v1/host/gallery/release', host.jwt);
+      expect(rel.status).toBe(204);
+    }
+
+    // Wait for the export to settle: both jobs done and the ZIP marked ready.
+    await expect
+      .poll(async () => {
+        const s = await exportStatus(host.jwt);
+        return s.released === true && s.zip?.status === 'done' && s.html?.status === 'done';
+      }, { timeout: 60_000, intervals: [500] })
+      .toBe(true);
+
+    // No export_job may be left stuck 'running' (would mean a worker that never
+    // completed — the failure mode the claim guard exists to avoid).
+    const jobs = await pgQuery<{ type: string; status: string }>(
+      `SELECT ej.type::text AS type, ej.status::text AS status
+         FROM export_job ej JOIN event e ON e.id = ej.event_id
+        WHERE e.slug = '${SLUG}'`
+    );
+    expect(jobs.length).toBe(2);
+    for (const j of jobs) expect(j.status, `${j.type} job status`).toBe('done');
+
+    // Download the ZIP and prove it is INTACT — a temp-file race would corrupt or
+    // truncate it. `unzip -t` verifies every entry's CRC; a non-zero exit throws.
+    const ticket = await mintTicket(host.jwt);
+    const res = await fetch(BASE + '/api/v1/export/zip?ticket=' + encodeURIComponent(ticket));
+    expect(res.status).toBe(200);
+    const bytes = Buffer.from(await res.arrayBuffer());
+    // ZIP local-file-header magic — a stomped/half-written file fails this immediately.
+    expect(bytes.subarray(0, 2).toString('latin1')).toBe('PK');
+
+    const dir = mkdtempSync(join(tmpdir(), 'es-zip-'));
+    const zipPath = join(dir, 'Gallery.zip');
+    writeFileSync(zipPath, bytes);
+
+    // Integrity: `unzip -t` exits 0 only if all CRCs check out and the archive is whole.
+    execFileSync('unzip', ['-t', zipPath], { stdio: 'pipe' });
+
+    // Completeness: exactly one entry per seeded upload — no entry lost to a stomped
+    // temp file, none duplicated by a second worker.
+    const listing = execFileSync('unzip', ['-Z1', zipPath], { encoding: 'utf8' })
+      .split('\n')
+      .map((l) => l.trim())
+      .filter((l) => l.length > 0 && !l.endsWith('/'));
+    expect(listing.length, `zip entries:\n${listing.join('\n')}`).toBe(N_UPLOADS);
+  });
+
+  test('re-release does NOT disturb an in-flight (running) export job — the anti-race guard', async ({
+    host,
+  }) => {
+    // Deterministic proof of the fix, independent of export timing. We simulate a worker
+    // that is still mid-export by pinning the zip job to `running` with a sentinel
+    // progress value, then drive reopen→re-release. The fix's
+    //   ON CONFLICT ... DO UPDATE ... WHERE export_job.status <> 'running'
+    // must leave that row untouched (and the freshly-spawned worker's
+    //   claim_job: UPDATE ... WHERE status = 'pending'
+    // finds nothing to claim, so it bails without racing the temp file).
+    //
+    // On the OLD code (unconditional ON CONFLICT DO UPDATE) the row would be reset to
+    // pending/progress=0 and a second worker would claim and run concurrently — so the
+    // sentinel below would be wiped. This assertion therefore fails on the bug and passes
+    // on the fix.
+    await seedUpload(host.jwt, { caption: 'a' });
+    await seedUpload(host.jwt, { caption: 'b' });
+
+    // Release and let the first export fully finish so no real worker is active.
+    expect((await post('/api/v1/host/gallery/release', host.jwt)).status).toBe(204);
+    await expect
+      .poll(async () => {
+        const s = await exportStatus(host.jwt);
+        return s.zip?.status === 'done' && s.html?.status === 'done';
+      }, { timeout: 60_000, intervals: [500] })
+      .toBe(true);
+
+    // Simulate an in-flight worker owning the zip job, with a sentinel we can check.
+    await pgQuery(
+      `UPDATE export_job ej SET status = 'running', progress_pct = 77
+         FROM event e
+        WHERE e.id = ej.event_id AND e.slug = '${SLUG}' AND ej.type = 'zip'`
+    );
+
+    // Reopen (clears release + ready flags, does NOT touch job rows) then re-release.
+    expect((await post('/api/v1/host/event/open', host.jwt)).status).toBe(204);
+    expect((await post('/api/v1/host/gallery/release', host.jwt)).status).toBe(204);
+
+    // Give any spawned worker a beat to attempt (and, correctly, bail) its claim.
+    await new Promise((r) => setTimeout(r, 750));
+
+    // The guard must have preserved the 'running' sentinel — untouched by both the
+    // re-enqueue and the bailing worker.
+    const [row] = await pgQuery<{ status: string; progress_pct: number }>(
+      `SELECT ej.status::text AS status, ej.progress_pct
+         FROM export_job ej JOIN event e ON e.id = ej.event_id
+        WHERE e.slug = '${SLUG}' AND ej.type = 'zip'`
+    );
+    expect(row.status, 'zip job status').toBe('running');
+    expect(Number(row.progress_pct), 'zip job sentinel progress').toBe(77);
+  });
+});

e2e/specs/10-flow-review/offline-resume.spec.ts

@@ -0,0 +1,100 @@
+/**
+ * Re-review regression guard — Chain B1 ("offline queue must auto-resume").
+ *
+ * Bug that was fixed: a file staged while OFFLINE was attempted immediately;
+ * the XHR network error marked the queue item `error`, and every resume path
+ * (the `online` listener, `processQueue`, `loadQueue`) only picks up `pending`
+ * items — so the item was stranded until a manual "Erneut" tap.
+ *
+ * The fix: network failures are a distinct `NetworkError` that keeps the item
+ * `pending`; `processQueue` bails while `navigator.onLine === false` (so an
+ * offline-staged item is never burned to `error`); and `requeueRetriable()`
+ * flips transient `error`→`pending` on the `online` event and on mount.
+ *
+ * This test drives a REAL browser going offline → stage+submit → reconnect and
+ * asserts the upload lands with NO manual interaction. It fails on the old code
+ * (item errors, never resumes) and passes on the fix.
+ */
+import { test, expect } from '../../fixtures/test';
+import { FeedPage, UploadSheet } from '../../page-objects';
+import { join } from 'node:path';
+
+const SAMPLE_JPG = join(process.cwd(), 'fixtures', 'media', 'sample.jpg');
+
+// White-box: read the upload queue straight out of IndexedDB so we can assert
+// the item's status without depending on the (currently unrendered) queue widget.
+async function queueStatuses(page: import('@playwright/test').Page): Promise<string[]> {
+  return page.evaluate(async () => {
+    const statuses = await new Promise<string[]>((resolve, reject) => {
+      const req = indexedDB.open('eventsnap-uploads', 3);
+      req.onerror = () => reject(req.error);
+      req.onsuccess = () => {
+        const dbh = req.result;
+        const tx = dbh.transaction('queue', 'readonly');
+        const all = tx.objectStore('queue').getAll();
+        all.onsuccess = () => resolve(all.result.map((r: any) => r.status));
+        all.onerror = () => reject(all.error);
+      };
+    });
+    return statuses;
+  });
+}
+
+test.describe('Flow re-review — offline upload auto-resume (B1)', () => {
+  test('offline-staged upload stays pending, then flushes on reconnect with no manual tap', async ({
+    page,
+    guest,
+    signIn,
+    db,
+  }) => {
+    const g = await guest('OfflineResume');
+    await signIn(page, g);
+    await page.goto('/feed');
+    expect(await db.countUploadsForUser(g.userId)).toBe(0);
+
+    // Warm the code-split `/upload` route chunk while still ONLINE. Without this, the
+    // client-side navigation the UploadSheet triggers would try to fetch the chunk with
+    // no connectivity and hit SvelteKit's error boundary — a test artifact unrelated to
+    // the upload-queue fix under test. (A production PWA service worker would cache it.)
+    await page.goto('/upload');
+    await page.goto('/feed');
+
+    // Go offline BEFORE staging so the first attempt happens with no connectivity.
+    await page.context().setOffline(true);
+
+    const feed = new FeedPage(page);
+    const sheet = new UploadSheet(page);
+    await feed.openUploadSheet();
+    await sheet.stageFiles([SAMPLE_JPG]);
+    await sheet.captionInput.waitFor({ state: 'visible', timeout: 10_000 });
+    await sheet.fillCaption('shot with no signal');
+    await sheet.submit();
+    // handleSubmit navigates to /feed after enqueuing even while offline.
+    await page.waitForURL('**/feed', { timeout: 15_000 });
+
+    // While offline: nothing may have reached the server, and — the crux of the
+    // fix — the item must be parked as `pending`, NOT burned to `error`/`blocked`
+    // (which on the old code would require a manual retry tap).
+    await expect
+      .poll(() => queueStatuses(page), { timeout: 8_000 })
+      .toEqual(['pending']);
+    expect(await db.countUploadsForUser(g.userId)).toBe(0);
+
+    // Reconnect. The `online` listener must resume the queue automatically — we do
+    // NOT navigate, tap retry, or otherwise touch the page.
+    await page.context().setOffline(false);
+
+    // The queued upload is now created server-side without any manual interaction.
+    await expect
+      .poll(() => db.countUploadsForUser(g.userId), { timeout: 20_000 })
+      .toBe(1);
+
+    // And the queue item ends terminal-good (done) or is drained — never stuck in error.
+    await expect
+      .poll(async () => {
+        const s = await queueStatuses(page);
+        return s.every((x) => x === 'done') || s.length === 0;
+      }, { timeout: 10_000 })
+      .toBe(true);
+  });
+});

frontend/Dockerfile

@@ -16,6 +16,10 @@ COPY --from=builder /app/build ./build
 COPY --from=builder /app/package.json ./
 RUN npm install --omit=dev
 
+# Run as the image's built-in non-root `node` user.
+RUN chown -R node:node /app
+USER node
+
 EXPOSE 3001
 ENV PORT=3001 HOST=0.0.0.0
 CMD ["node", "build"]

frontend/package.json

@@ -9,7 +9,9 @@
 		"preview": "vite preview",
 		"prepare": "svelte-kit sync || echo ''",
 		"check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json",
-		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch"
+		"check:watch": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --watch",
+		"test:unit": "vitest run",
+		"test:unit:watch": "vitest"
 	},
 	"devDependencies": {
 		"@sveltejs/adapter-auto": "^7.0.0",
@@ -18,13 +20,16 @@
 		"@sveltejs/vite-plugin-svelte": "^6.2.4",
 		"@tailwindcss/vite": "^4.2.2",
 		"@types/qrcode": "^1.5.6",
+		"jsdom": "^29.1.1",
 		"svelte": "^5.54.0",
 		"svelte-check": "^4.4.2",
 		"tailwindcss": "^4.2.2",
 		"typescript": "^5.9.3",
-		"vite": "^7.3.1"
+		"vite": "^7.3.1",
+		"vitest": "^4.1.9"
 	},
 	"dependencies": {
+		"@tanstack/svelte-virtual": "^3.13.30",
 		"idb": "^8.0.3",
 		"qrcode": "^1.5.4"
 	}

frontend/src/app.css

@@ -1 +1,15 @@
 @import "./tailwind-theme.css";
+
+/* Respect the OS "reduce motion" setting. Collapses every animation/transition
+ * (HeartBurst, Skeleton pulse, diashow cross-fades, sheet/FAB slides) to a
+ * near-instant change rather than removing them outright, so state still updates. */
+@media (prefers-reduced-motion: reduce) {
+	*,
+	*::before,
+	*::after {
+		animation-duration: 0.01ms !important;
+		animation-iteration-count: 1 !important;
+		transition-duration: 0.01ms !important;
+		scroll-behavior: auto !important;
+	}
+}

frontend/src/app.html

@@ -1,16 +1,30 @@
 <!doctype html>
-<html lang="en">
+<html lang="de">
 	<head>
 		<meta charset="utf-8" />
-		<meta name="viewport" content="width=device-width, initial-scale=1" />
+		<!-- viewport-fit=cover activates the env(safe-area-inset-*) padding used by the
+		     bottom nav, sheets, toasts and FAB on notched / home-indicator devices. -->
+		<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover" />
 		<meta name="text-scale" content="scale" />
-		<meta name="theme-color" content="#ffffff" />
+		<!-- Light/dark theme-color so the browser chrome matches the active theme. -->
+		<meta name="theme-color" content="#ffffff" media="(prefers-color-scheme: light)" />
+		<meta name="theme-color" content="#030712" media="(prefers-color-scheme: dark)" />
+		<!-- Installable PWA keepsake: manifest + Apple home-screen metadata. -->
+		<link rel="manifest" href="%sveltekit.assets%/manifest.webmanifest" />
+		<link rel="icon" href="%sveltekit.assets%/icon.svg" type="image/svg+xml" />
+		<link rel="apple-touch-icon" href="%sveltekit.assets%/icon.svg" />
+		<meta name="apple-mobile-web-app-capable" content="yes" />
+		<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent" />
+		<meta name="apple-mobile-web-app-title" content="EventSnap" />
 		<!--
 			FOUC guard: apply the dark class *before* paint, so reloads of pages with
 			theme=dark don't flash a white screen. Mirrors the logic in
 			`src/lib/theme-store.ts`; kept in sync by hand (it's 6 lines).
 		-->
-		<script>
+		<!-- nonce is required: our CSP sets script-src 'self', and SvelteKit's
+		     mode:'auto' only hashes scripts *it* injects, not this template-authored
+		     one. %sveltekit.nonce% is substituted per request and added to the CSP. -->
+		<script nonce="%sveltekit.nonce%">
 			(function () {
 				try {
 					var pref = localStorage.getItem('eventsnap_theme') || 'system';

frontend/src/lib/actions/doubletap.ts

@@ -1,9 +1,14 @@
-// Svelte action — fires a `doubletap` CustomEvent when two pointerup events occur
-// within `interval` ms on roughly the same spot. Used in the lightbox for the
-// Instagram-style "double-tap to like" gesture.
+// Svelte action — the single source of truth for tap gestures on a media element.
+// Fires a `doubletap` CustomEvent when two pointerup events occur within `interval`
+// ms on roughly the same spot (Instagram-style "double-tap to like"), and a
+// `singletap` CustomEvent once `interval` has elapsed with no second tap. Owning
+// both gestures in one place means a component no longer juggles its own debounce
+// timer alongside a separate onclick handler.
 //
 // Native `dblclick` exists, but on iOS Safari it also zooms the page; gating on
-// pointer events lets us preventDefault selectively and avoid the zoom.
+// pointer events lets us preventDefault selectively and avoid the zoom. Keyboard
+// activation still arrives as a normal `click` (detail === 0) — handle that on the
+// element itself for an immediate, latency-free open.
 
 import type { ActionReturn } from 'svelte/action';
 
@@ -16,6 +21,7 @@ export interface DoubletapOptions {
 
 interface DoubletapAttributes {
 	'ondoubletap'?: (event: CustomEvent<void>) => void;
+	'onsingletap'?: (event: CustomEvent<void>) => void;
 }
 
 export function doubletap(
@@ -26,12 +32,21 @@ export function doubletap(
 	let lastTime = 0;
 	let lastX = 0;
 	let lastY = 0;
+	let singleTimer: ReturnType<typeof setTimeout> | null = null;
+
+	const clearSingle = () => {
+		if (singleTimer) {
+			clearTimeout(singleTimer);
+			singleTimer = null;
+		}
+	};
 
 	const onPointerUp = (e: PointerEvent) => {
 		const now = performance.now();
 		const dx = Math.abs(e.clientX - lastX);
 		const dy = Math.abs(e.clientY - lastY);
 		if (now - lastTime < interval && dx < MOVE_THRESHOLD && dy < MOVE_THRESHOLD) {
+			clearSingle(); // the pending single-tap was actually the first of a double
 			e.preventDefault();
 			node.dispatchEvent(new CustomEvent('doubletap'));
 			lastTime = 0; // reset so a triple-tap doesn't re-fire
@@ -40,6 +55,12 @@ export function doubletap(
 		lastTime = now;
 		lastX = e.clientX;
 		lastY = e.clientY;
+		// Defer the single-tap action until we're sure no second tap follows.
+		clearSingle();
+		singleTimer = setTimeout(() => {
+			singleTimer = null;
+			node.dispatchEvent(new CustomEvent('singletap'));
+		}, interval);
 	};
 
 	node.addEventListener('pointerup', onPointerUp);
@@ -49,6 +70,7 @@ export function doubletap(
 			interval = newOptions.interval ?? INTERVAL_MS;
 		},
 		destroy() {
+			clearSingle();
 			node.removeEventListener('pointerup', onPointerUp);
 		}
 	};

frontend/src/lib/actions/focus-trap.ts

@@ -17,8 +17,11 @@ const FOCUSABLE =
 	'a[href], area[href], input:not([disabled]):not([type="hidden"]), select:not([disabled]), textarea:not([disabled]), button:not([disabled]), iframe, object, embed, [tabindex]:not([tabindex="-1"]), [contenteditable="true"]';
 
 function focusables(root: HTMLElement): HTMLElement[] {
+	// `offsetParent` is null for any `position: fixed` element (and our sheets/modals
+	// are fixed), so it would wrongly drop their buttons. `getClientRects().length`
+	// is true whenever the element is actually rendered — fixed or not.
 	return Array.from(root.querySelectorAll<HTMLElement>(FOCUSABLE)).filter(
-		(el) => !el.hasAttribute('disabled') && el.offsetParent !== null
+		(el) => !el.hasAttribute('disabled') && el.getClientRects().length > 0
 	);
 }
 
@@ -61,11 +64,16 @@ export function focusTrap(
 	node.addEventListener('keydown', onKeyDown);
 
 	if (opts.autoFocus !== false) {
-		// Defer one frame so the element is fully laid out (sheets animate in).
+		// Focus the container synchronously on mount so the trap owns the keyboard
+		// immediately — otherwise an Escape pressed before the deferred focus below
+		// lands on an element *outside* the node, where this node-scoped listener
+		// never sees it (the keystroke is silently dropped). Then defer one frame to
+		// move focus onto the first control once the sheet has laid out / animated in.
+		if (!node.hasAttribute('tabindex')) node.setAttribute('tabindex', '-1');
+		node.focus({ preventScroll: true });
 		requestAnimationFrame(() => {
 			const list = focusables(node);
 			const target = list[0] ?? node;
-			if (!node.hasAttribute('tabindex')) node.setAttribute('tabindex', '-1');
 			target.focus({ preventScroll: true });
 		});
 	}

frontend/src/lib/actions/modal-inert.ts

@@ -0,0 +1,29 @@
+// Make everything *outside* a modal's subtree inert while it's open, so screen
+// readers and tab order can't reach the background (focus-trap only covers
+// keyboard focus; `inert` also hides the content from assistive tech).
+//
+// Walks from the node up to <body> and marks every sibling along the path as
+// inert, then restores exactly those it changed on teardown. Applying it to a
+// `display: contents` wrapper keeps the modal's own backdrop + dialog interactive.
+export function modalInert(node: HTMLElement) {
+	const changed: HTMLElement[] = [];
+
+	let el: HTMLElement | null = node;
+	while (el && el !== document.body) {
+		const parent: HTMLElement | null = el.parentElement;
+		if (!parent) break;
+		for (const sib of Array.from(parent.children)) {
+			if (sib !== el && sib instanceof HTMLElement && !sib.hasAttribute('inert')) {
+				sib.setAttribute('inert', '');
+				changed.push(sib);
+			}
+		}
+		el = parent;
+	}
+
+	return {
+		destroy() {
+			for (const sib of changed) sib.removeAttribute('inert');
+		}
+	};
+}

frontend/src/lib/actions/pull-to-refresh.ts

@@ -22,8 +22,17 @@ export function pullToRefresh(
 ): ActionReturn<PullToRefreshOptions> {
 	let opts = options;
 	let startY = 0;
+	let startX = 0;
 	let pulling = false;
 	let triggered = false;
+	let intentLocked = false; // have we decided this gesture is a vertical pull?
+
+	// Distance the finger must travel before we commit to "this is a vertical pull"
+	// vs. a horizontal swipe or an incidental tap.
+	const INTENT_SLOP = 8;
+	// Rubber-band resistance: the sheet follows the finger at a fraction of 1:1 so
+	// the pull feels elastic rather than rigid.
+	const RESISTANCE = 0.5;
 
 	function scroller(): HTMLElement | (Window & typeof globalThis) {
 		return node.scrollHeight > node.clientHeight ? node : window;
@@ -40,17 +49,54 @@ export function pullToRefresh(
 		opts.onpull(Math.max(0, delta), Math.max(0, delta) / threshold);
 	}
 
+	function reset() {
+		pulling = false;
+		intentLocked = false;
+	}
+
 	function onTouchStart(e: TouchEvent) {
 		if (opts.disabled) return;
+		// Ignore pinch / multi-finger gestures entirely.
+		if (e.touches.length !== 1) {
+			reset();
+			return;
+		}
 		if (scrollTop() > 0) return;
 		startY = e.touches[0].clientY;
+		startX = e.touches[0].clientX;
 		pulling = true;
 		triggered = false;
+		intentLocked = false;
 	}
 
 	function onTouchMove(e: TouchEvent) {
 		if (!pulling || triggered) return;
-		const delta = e.touches[0].clientY - startY;
+		// A second finger landing mid-gesture cancels the pull.
+		if (e.touches.length !== 1) {
+			reset();
+			return;
+		}
+
+		const rawDy = e.touches[0].clientY - startY;
+		const dx = e.touches[0].clientX - startX;
+
+		// Decide intent once, after the finger has moved past the slop. A
+		// horizontal-dominant or upward move is not a pull — bail and let the
+		// browser scroll normally.
+		if (!intentLocked) {
+			if (Math.abs(rawDy) < INTENT_SLOP && Math.abs(dx) < INTENT_SLOP) return;
+			if (rawDy <= 0 || Math.abs(rawDy) <= Math.abs(dx)) {
+				reset();
+				return;
+			}
+			intentLocked = true;
+		}
+
+		// Committed vertical pull at the top edge: stop the browser's own
+		// overscroll / pull-to-refresh from competing for the gesture.
+		if (e.cancelable) e.preventDefault();
+
+		const delta = rawDy * RESISTANCE;
 		reportPull(delta);
 		if (delta > (opts.threshold ?? 60)) {
 			triggered = true;
@@ -60,11 +106,12 @@ export function pullToRefresh(
 
 	function onTouchEnd() {
 		if (pulling && !triggered) reportPull(0);
-		pulling = false;
+		reset();
 	}
 
 	node.addEventListener('touchstart', onTouchStart, { passive: true });
-	node.addEventListener('touchmove', onTouchMove, { passive: true });
+	// Non-passive so we can preventDefault() once a top-edge pull is in progress.
+	node.addEventListener('touchmove', onTouchMove, { passive: false });
 	node.addEventListener('touchend', onTouchEnd);
 	node.addEventListener('touchcancel', onTouchEnd);
 

frontend/src/lib/actions/scroll-lock.ts

@@ -0,0 +1,50 @@
+// Body scroll-lock for open dialogs/sheets. While any locker is active, the
+// document body can't scroll behind the overlay. Ref-counted so that nested or
+// stacked dialogs (e.g. a ConfirmSheet opened from the LightboxModal) don't let
+// the first one to close unlock the page out from under the others. Compensates
+// for the vanished scrollbar width so the layout doesn't jump on lock.
+
+import type { ActionReturn } from 'svelte/action';
+
+let lockCount = 0;
+let savedOverflow = '';
+let savedPaddingRight = '';
+
+function lock() {
+	if (typeof document === 'undefined') return;
+	if (lockCount === 0) {
+		const body = document.body;
+		const scrollbarWidth = window.innerWidth - document.documentElement.clientWidth;
+		savedOverflow = body.style.overflow;
+		savedPaddingRight = body.style.paddingRight;
+		body.style.overflow = 'hidden';
+		if (scrollbarWidth > 0) {
+			const current = parseFloat(getComputedStyle(body).paddingRight) || 0;
+			body.style.paddingRight = `${current + scrollbarWidth}px`;
+		}
+	}
+	lockCount++;
+}
+
+function unlock() {
+	if (typeof document === 'undefined') return;
+	lockCount = Math.max(0, lockCount - 1);
+	if (lockCount === 0) {
+		document.body.style.overflow = savedOverflow;
+		document.body.style.paddingRight = savedPaddingRight;
+	}
+}
+
+/**
+ * Locks body scroll for the lifetime of the node. Mount the node only while the
+ * dialog is open (e.g. inside `{#if open}` or alongside a `class:` toggle) so the
+ * action's create/destroy line up with open/close.
+ */
+export function scrollLock(node: HTMLElement): ActionReturn {
+	lock();
+	return {
+		destroy() {
+			unlock();
+		}
+	};
+}

frontend/src/lib/api.ts

@@ -13,6 +13,8 @@ export class ApiError extends Error {
 	}
 }
 
+const TIMEOUT_MS = 20_000;
+
 async function request<T>(
 	method: string,
 	path: string,
@@ -27,23 +29,53 @@ async function request<T>(
 		headers['Content-Type'] = 'application/json';
 	}
 
-	const res = await fetch(`${BASE}${path}`, {
-		method,
-		headers,
-		body: body !== undefined ? JSON.stringify(body) : undefined
-	});
+	// Abort hung requests so a dead connection surfaces as a friendly error
+	// instead of a spinner that never resolves.
+	const controller = new AbortController();
+	const timer = setTimeout(() => controller.abort(), TIMEOUT_MS);
+
+	let res: Response;
+	try {
+		res = await fetch(`${BASE}${path}`, {
+			method,
+			headers,
+			body: body !== undefined ? JSON.stringify(body) : undefined,
+			signal: controller.signal
+		});
+	} catch (e) {
+		if (e instanceof DOMException && e.name === 'AbortError') {
+			throw new ApiError(0, 'timeout', 'Zeitüberschreitung – bitte erneut versuchen.');
+		}
+		throw new ApiError(0, 'network', 'Netzwerkfehler – bitte Verbindung prüfen.');
+	} finally {
+		clearTimeout(timer);
+	}
 
 	if (res.status === 204) {
 		return undefined as T;
 	}
 
-	const data = await res.json();
+	// A 5xx behind a proxy (or a crash page) can return HTML, not JSON — parsing
+	// it directly would throw an opaque SyntaxError. Read text, parse defensively.
+	const raw = await res.text();
+	let data: { error?: string; message?: string } | unknown = null;
+	if (raw) {
+		try {
+			data = JSON.parse(raw);
+		} catch {
+			data = null;
+		}
+	}
 
 	if (!res.ok) {
+		// An expired/invalid token (401) clears the dead session. Banned users are
+		// NOT logged out — they keep read access by design (USER_JOURNEYS §10) and
+		// simply get a 403 "gesperrt" toast on writes.
 		if (res.status === 401) {
 			clearAuth();
 		}
-		throw new ApiError(res.status, data.error ?? 'unknown', data.message ?? 'Fehler');
+		const d = (data ?? {}) as { error?: string; message?: string };
+		throw new ApiError(res.status, d.error ?? 'unknown', d.message ?? `Serverfehler (${res.status}).`);
 	}
 
 	return data as T;

frontend/src/lib/auth.test.ts

@@ -0,0 +1,68 @@
+// @vitest-environment jsdom
+import { describe, it, expect, beforeEach, vi } from 'vitest';
+
+// auth.ts guards every localStorage access behind `browser`; force it true so the
+// jsdom localStorage is actually used (the shared mock stubs it to false).
+vi.mock('$app/environment', () => ({ browser: true, dev: false, building: false, version: 'test' }));
+
+import { setAuth, getToken, getPin, getExpiry, getRole, clearAuth, clearPin } from './auth';
+
+/** Build a JWT-shaped string (header.payload.sig) with the given claims. */
+function makeJwt(claims: object): string {
+  const seg = (o: object) => btoa(JSON.stringify(o));
+  return `${seg({ alg: 'HS256', typ: 'JWT' })}.${seg(claims)}.sig`;
+}
+
+beforeEach(() => localStorage.clear());
+
+describe('auth — token storage', () => {
+  it('setAuth then getToken/getPin round-trips', () => {
+    setAuth('a.b.c', '1234', 'uid-1', 'Alice');
+    expect(getToken()).toBe('a.b.c');
+    expect(getPin()).toBe('1234');
+  });
+
+  it('setAuth without a PIN leaves the PIN unset', () => {
+    setAuth('a.b.c', null, 'uid-1');
+    expect(getToken()).toBe('a.b.c');
+    expect(getPin()).toBeNull();
+  });
+
+  it('clearAuth removes the token but KEEPS the PIN (needed for recovery)', () => {
+    setAuth('a.b.c', '1234', 'uid');
+    clearAuth();
+    expect(getToken()).toBeNull();
+    expect(getPin()).toBe('1234');
+  });
+
+  it('clearPin removes the cached PIN', () => {
+    setAuth('a.b.c', '1234', 'uid');
+    clearPin();
+    expect(getPin()).toBeNull();
+  });
+});
+
+describe('auth — JWT claim decode', () => {
+  it('getExpiry decodes the exp claim (seconds → ms Date)', () => {
+    const exp = 2_000_000_000; // far-future unix seconds
+    setAuth(makeJwt({ exp }), null, 'u');
+    expect(getExpiry()?.getTime()).toBe(exp * 1000);
+  });
+
+  it('getExpiry is null with no token, no exp claim, or a malformed token', () => {
+    expect(getExpiry()).toBeNull(); // no token
+    setAuth(makeJwt({ role: 'guest' }), null, 'u'); // token without exp
+    expect(getExpiry()).toBeNull();
+    localStorage.setItem('eventsnap_jwt', 'not-a-jwt'); // unparseable
+    expect(getExpiry()).toBeNull();
+  });
+
+  it('getRole extracts the role claim; null when absent or malformed', () => {
+    setAuth(makeJwt({ role: 'host' }), null, 'u');
+    expect(getRole()).toBe('host');
+    setAuth(makeJwt({ exp: 1 }), null, 'u'); // no role claim
+    expect(getRole()).toBeNull();
+    localStorage.setItem('eventsnap_jwt', 'x.y.z'); // unparseable payload
+    expect(getRole()).toBeNull();
+  });
+});

frontend/src/lib/auth.ts

@@ -83,6 +83,9 @@ export function clearAuth(): void {
 	if (!browser) return;
 	localStorage.removeItem(TOKEN_KEY);
 	localStorage.removeItem(USER_ID_KEY);
+	// Clear the display name too — on a shared device the next user shouldn't see
+	// the previous guest's name pre-filled on /join.
+	localStorage.removeItem(DISPLAY_NAME_KEY);
 	// PIN is intentionally kept so the user can recover
 	isAuthenticated.set(false);
 	// Hooks fire in registration order. Keep them dependency-free of each other —

frontend/src/lib/avatar.test.ts

@@ -0,0 +1,39 @@
+import { describe, it, expect } from 'vitest';
+import { avatarPalette, initials } from './avatar';
+
+describe('avatarPalette', () => {
+  it('returns the neutral palette for empty / nullish names', () => {
+    expect(avatarPalette(null)).toContain('bg-gray-100');
+    expect(avatarPalette(undefined)).toContain('bg-gray-100');
+    expect(avatarPalette('')).toContain('bg-gray-100');
+  });
+
+  it('is deterministic for the same name', () => {
+    expect(avatarPalette('Alice')).toBe(avatarPalette('Alice'));
+  });
+
+  it('returns a real palette entry (not neutral) for a non-empty name', () => {
+    expect(avatarPalette('Bob')).toMatch(/bg-(blue|purple|green|amber|rose|teal)-100/);
+  });
+});
+
+describe('initials', () => {
+  it('returns "?" for empty / nullish / whitespace-only names', () => {
+    expect(initials(null)).toBe('?');
+    expect(initials(undefined)).toBe('?');
+    expect(initials('')).toBe('?');
+    expect(initials('   ')).toBe('?');
+  });
+
+  it('uses the first letter (uppercased) for a single word', () => {
+    expect(initials('alice')).toBe('A');
+  });
+
+  it('uses the first letters of the first two words', () => {
+    expect(initials('Alice Bob Carol')).toBe('AB');
+  });
+
+  it('collapses runs of whitespace between words', () => {
+    expect(initials('  john   doe ')).toBe('JD');
+  });
+});