feat(v1.1.5): files SDK + files:* triggers

Filesystem-backed blob storage as the fifth concrete trigger kind.

- `files::collection(c).{create,head,get,update,delete,list}` Rhai SDK
  (blob in/out; metadata maps; missing-field throws naming the field).
- `FilesService` trait in picloud-shared; `FsFilesRepo` (atomic
  write: temp→fsync→rename→fsync-dir→DB; single-pass SHA-256;
  checksum-verified reads → Corrupted) + `FilesServiceImpl` in
  manager-core. Metadata in Postgres (0018), bytes on disk under
  PICLOUD_FILES_ROOT with 0o700 shard dirs.
- `files:*` trigger kind via the Layout-E pattern (0019: widen both
  CHECKs + files_trigger_details), TriggerEvent::Files (metadata only,
  no bytes), emit_files fan-out, dispatcher arm, admin endpoint
  POST /triggers/files (reuses validate_trigger_target).
- AppFilesRead/AppFilesWrite capabilities → script:read/script:write
  (seven-scope commitment held). AppPubsubPublish reserved for v1.1.6.
- Admin files API (list + delete) + dashboard Files view per app.

Cross-app isolation keyed on cx.app_id at every layer. ~45 new tests
(service in-memory, fs tempdir, bridge integration). No DB required
for the suite. publish_ephemeral and the orphan sweep stay deferred.

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

crates/manager-core/migrations/0018_files.sql

@@ -0,0 +1,25 @@
+-- v1.1.5: filesystem-backed blob storage. The row holds metadata +
+-- the SHA-256 checksum; the blob bytes live on disk at
+--   <PICLOUD_FILES_ROOT>/files/<app_id>/<collection>/<id[0:2]>/<id>
+-- (never in Postgres). Identity tuple is (app_id, collection, id) per
+-- docs/sdk-shape.md, matching KV/docs collection scoping.
+--
+-- The checksum is computed in a single pass during the atomic write and
+-- re-verified on read (FilesError::Corrupted on mismatch). Per-app
+-- quotas are deferred to v1.2; only the per-file size cap is enforced
+-- (in the service, not the schema).
+CREATE TABLE files (
+    app_id          UUID NOT NULL REFERENCES apps(id) ON DELETE CASCADE,
+    collection      TEXT NOT NULL,
+    id              UUID NOT NULL,
+    name            TEXT NOT NULL,
+    content_type    TEXT NOT NULL,
+    size_bytes      BIGINT NOT NULL,
+    checksum_sha256 TEXT NOT NULL,           -- hex, 64 chars, lowercase
+    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (app_id, collection, id)
+);
+
+-- List + cursor pagination scans by (app_id, collection).
+CREATE INDEX idx_files_app_collection ON files (app_id, collection);

crates/manager-core/migrations/0019_files_triggers.sql

@@ -0,0 +1,29 @@
+-- v1.1.5: extend the triggers framework to recognise `files` as the
+-- fifth concrete kind (after `kv`/`dead_letter` v1.1.1, `docs` v1.1.2,
+-- `cron` v1.1.4). Mirrors the 0014/0017 extensions exactly: two CHECK
+-- constraints widen (strictly gaining `'files'`), one new detail table.
+--
+-- Files rows route through the SAME generic dispatcher path as the
+-- other event kinds (single match-arm extension on the Rust side). The
+-- only new machinery is the FilesServiceImpl emitting ServiceEvents
+-- that the OutboxEventEmitter fans out — identical to KV/docs.
+
+-- Extend triggers.kind to include 'files'. No existing row carries a
+-- value outside the widened set, so the drop+add is safe.
+ALTER TABLE triggers DROP CONSTRAINT triggers_kind_check;
+ALTER TABLE triggers ADD CONSTRAINT triggers_kind_check
+    CHECK (kind IN ('kv', 'dead_letter', 'docs', 'cron', 'files'));
+
+-- Extend outbox.source_kind to include 'files'.
+ALTER TABLE outbox DROP CONSTRAINT outbox_source_kind_check;
+ALTER TABLE outbox ADD CONSTRAINT outbox_source_kind_check
+    CHECK (source_kind IN ('http', 'kv', 'dead_letter', 'docs', 'cron', 'files'));
+
+-- One row per files trigger. Mirrors kv_trigger_details:
+--   collection_glob — "*", "exact", or "prefix*"
+--   ops             — subset of {create, update, delete}, empty = any
+CREATE TABLE files_trigger_details (
+    trigger_id        UUID PRIMARY KEY REFERENCES triggers(id) ON DELETE CASCADE,
+    collection_glob   TEXT NOT NULL,
+    ops               TEXT[] NOT NULL
+);

crates/manager-core/src/authz.rs

@@ -78,6 +78,17 @@ pub enum Capability {
     /// so the conservative write mapping is correct. Splitting
     /// read/write is a v1.2+ refinement. Granted to `editor`+.
     AppHttpRequest(AppId),
+    /// Read blobs from this app's files store (v1.1.5). Same trust
+    /// shape as KV/docs read — granted to `viewer`+, maps to
+    /// `script:read` on API keys. Honors the seven-scope commitment.
+    AppFilesRead(AppId),
+    /// Write blobs to this app's files store (v1.1.5). Granted to
+    /// `editor`+, maps to `script:write` on API keys.
+    AppFilesWrite(AppId),
+    /// Publish a durable pub/sub message from a script in this app
+    /// (v1.1.5). Maps to `script:write` on API keys (a publish is a
+    /// write that fans out to subscribers). Granted to `editor`+.
+    AppPubsubPublish(AppId),
     /// Create / list / delete triggers for this app (v1.1.1). Maps to
     /// `app:admin` on API keys — triggers are app-configuration acts
     /// rather than data-plane access. Granted to `app_admin`+.
@@ -108,6 +119,9 @@ impl Capability {
             | Self::AppDocsRead(id)
             | Self::AppDocsWrite(id)
             | Self::AppHttpRequest(id)
+            | Self::AppFilesRead(id)
+            | Self::AppFilesWrite(id)
+            | Self::AppPubsubPublish(id)
             | Self::AppManageTriggers(id)
             | Self::AppDeadLetterManage(id) => Some(id),
         }
@@ -124,11 +138,16 @@ impl Capability {
             Self::InstanceCreateApp | Self::InstanceManageUsers | Self::InstanceManageSettings => {
                 Scope::InstanceAdmin
             }
-            Self::AppRead(_) | Self::AppKvRead(_) | Self::AppDocsRead(_) => Scope::ScriptRead,
+            Self::AppRead(_)
+            | Self::AppKvRead(_)
+            | Self::AppDocsRead(_)
+            | Self::AppFilesRead(_) => Scope::ScriptRead,
             Self::AppWriteScript(_)
             | Self::AppKvWrite(_)
             | Self::AppDocsWrite(_)
-            | Self::AppHttpRequest(_) => Scope::ScriptWrite,
+            | Self::AppHttpRequest(_)
+            | Self::AppFilesWrite(_)
+            | Self::AppPubsubPublish(_) => Scope::ScriptWrite,
             Self::AppWriteRoute(_) => Scope::RouteWrite,
             Self::AppManageDomains(_) => Scope::DomainManage,
             Self::AppAdmin(_) | Self::AppManageTriggers(_) | Self::AppDeadLetterManage(_) => {
@@ -277,6 +296,7 @@ const fn role_satisfies(role: AppRole, cap: Capability) -> bool {
             | Capability::AppLogRead(_)
             | Capability::AppKvRead(_)
             | Capability::AppDocsRead(_)
+            | Capability::AppFilesRead(_)
     );
     let in_editor = in_viewer
         || matches!(
@@ -286,6 +306,8 @@ const fn role_satisfies(role: AppRole, cap: Capability) -> bool {
                 | Capability::AppKvWrite(_)
                 | Capability::AppDocsWrite(_)
                 | Capability::AppHttpRequest(_)
+                | Capability::AppFilesWrite(_)
+                | Capability::AppPubsubPublish(_)
         );
     let in_app_admin = in_editor
         || matches!(

crates/manager-core/src/dispatcher.rs

@@ -166,7 +166,8 @@ impl Dispatcher {
             OutboxSourceKind::Kv
             | OutboxSourceKind::Docs
             | OutboxSourceKind::DeadLetter
-            | OutboxSourceKind::Cron => {
+            | OutboxSourceKind::Cron
+            | OutboxSourceKind::Files => {
                 let resolved = self.resolve_trigger(&row).await?;
                 let req = match self.build_exec_request(&row, &resolved).await {
                     Ok(req) => req,

crates/manager-core/src/files_api.rs

@@ -0,0 +1,215 @@
+//! `/api/v1/admin/apps/{id}/files*` — minimal files admin endpoints
+//! backing the dashboard's files view (v1.1.5).
+//!
+//! Two operations only, both operator-facing:
+//!   * `GET  /apps/{id}/files?collection=<c>&cursor=&limit=` — list file
+//!     metadata for a collection (cursor-paginated).
+//!   * `DELETE /apps/{id}/files/{collection}/{file_id}` — remove a file.
+//!
+//! These talk to the `FilesRepo` directly (like `triggers_api` talks to
+//! `TriggerRepo`), guarded by the same capability model as the SDK
+//! (`AppFilesRead` / `AppFilesWrite`). **Admin deletes do NOT emit a
+//! `files:delete` trigger event** — they're operator cleanup actions,
+//! not script mutations (see HANDBACK §7). The capability binds to the
+//! resource's `app_id` after the app is loaded.
+
+use std::sync::Arc;
+
+use axum::extract::{Path, Query, State};
+use axum::http::StatusCode;
+use axum::response::{IntoResponse, Json, Response};
+use axum::routing::{delete, get};
+use axum::{Extension, Router};
+use picloud_shared::{AppId, Principal};
+use serde::{Deserialize, Serialize};
+use serde_json::json;
+use uuid::Uuid;
+
+use crate::app_repo::AppRepository;
+use crate::authz::{require, AuthzDenied, AuthzError, AuthzRepo, Capability};
+use crate::files_repo::{FilesRepo, FilesRepoError};
+
+#[derive(Clone)]
+pub struct FilesAdminState {
+    pub files: Arc<dyn FilesRepo>,
+    pub apps: Arc<dyn AppRepository>,
+    pub authz: Arc<dyn AuthzRepo>,
+}
+
+pub fn files_admin_router(state: FilesAdminState) -> Router {
+    Router::new()
+        .route("/apps/{app_id}/files", get(list_files))
+        .route(
+            "/apps/{app_id}/files/{collection}/{file_id}",
+            delete(delete_file),
+        )
+        .with_state(state)
+}
+
+#[derive(Debug, Deserialize)]
+pub struct ListFilesQuery {
+    pub collection: String,
+    #[serde(default)]
+    pub cursor: Option<String>,
+    #[serde(default)]
+    pub limit: Option<u32>,
+}
+
+#[derive(Debug, Serialize)]
+struct FileMetaDto {
+    id: String,
+    collection: String,
+    name: String,
+    content_type: String,
+    size: u64,
+    checksum: String,
+    created_at: String,
+    updated_at: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ListFilesResponse {
+    files: Vec<FileMetaDto>,
+    next_cursor: Option<String>,
+}
+
+async fn list_files(
+    State(s): State<FilesAdminState>,
+    Extension(principal): Extension<Principal>,
+    Path(app_id): Path<AppId>,
+    Query(q): Query<ListFilesQuery>,
+) -> Result<Json<ListFilesResponse>, FilesApiError> {
+    ensure_app_exists(&*s.apps, app_id).await?;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppFilesRead(app_id),
+    )
+    .await?;
+    if q.collection.trim().is_empty() {
+        return Err(FilesApiError::Invalid(
+            "collection must not be empty".into(),
+        ));
+    }
+    let page = s
+        .files
+        .list(
+            app_id,
+            &q.collection,
+            q.cursor.as_deref(),
+            q.limit.unwrap_or(0),
+        )
+        .await?;
+    let files = page
+        .files
+        .into_iter()
+        .map(|m| FileMetaDto {
+            id: m.id.to_string(),
+            collection: m.collection,
+            name: m.name,
+            content_type: m.content_type,
+            size: m.size,
+            checksum: m.checksum,
+            created_at: m.created_at.to_rfc3339(),
+            updated_at: m.updated_at.to_rfc3339(),
+        })
+        .collect();
+    Ok(Json(ListFilesResponse {
+        files,
+        next_cursor: page.next_cursor,
+    }))
+}
+
+async fn delete_file(
+    State(s): State<FilesAdminState>,
+    Extension(principal): Extension<Principal>,
+    Path((app_id, collection, file_id)): Path<(AppId, String, String)>,
+) -> Result<StatusCode, FilesApiError> {
+    ensure_app_exists(&*s.apps, app_id).await?;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppFilesWrite(app_id),
+    )
+    .await?;
+    let id = Uuid::parse_str(&file_id).map_err(|_| FilesApiError::NotFound)?;
+    if s.files.delete(app_id, &collection, id).await?.is_none() {
+        return Err(FilesApiError::NotFound);
+    }
+    Ok(StatusCode::NO_CONTENT)
+}
+
+async fn ensure_app_exists(apps: &dyn AppRepository, app_id: AppId) -> Result<(), FilesApiError> {
+    apps.get_by_id(app_id)
+        .await
+        .map_err(|e| FilesApiError::Backend(e.to_string()))?
+        .ok_or(FilesApiError::AppNotFound)?;
+    Ok(())
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum FilesApiError {
+    #[error("app not found")]
+    AppNotFound,
+    #[error("file not found")]
+    NotFound,
+    #[error("invalid request: {0}")]
+    Invalid(String),
+    #[error("forbidden")]
+    Forbidden,
+    #[error("authorization repo error: {0}")]
+    AuthzRepo(String),
+    #[error("files backend: {0}")]
+    Backend(String),
+}
+
+impl From<AuthzDenied> for FilesApiError {
+    fn from(d: AuthzDenied) -> Self {
+        match d {
+            AuthzDenied::Denied => Self::Forbidden,
+            AuthzDenied::Repo(e) => Self::AuthzRepo(e.to_string()),
+        }
+    }
+}
+
+impl From<AuthzError> for FilesApiError {
+    fn from(e: AuthzError) -> Self {
+        Self::AuthzRepo(e.to_string())
+    }
+}
+
+impl From<FilesRepoError> for FilesApiError {
+    fn from(e: FilesRepoError) -> Self {
+        Self::Backend(e.to_string())
+    }
+}
+
+impl IntoResponse for FilesApiError {
+    fn into_response(self) -> Response {
+        let (status, body) = match &self {
+            Self::AppNotFound | Self::NotFound => {
+                (StatusCode::NOT_FOUND, json!({ "error": self.to_string() }))
+            }
+            Self::Invalid(_) => (
+                StatusCode::UNPROCESSABLE_ENTITY,
+                json!({ "error": self.to_string() }),
+            ),
+            Self::Forbidden => (StatusCode::FORBIDDEN, json!({ "error": self.to_string() })),
+            Self::AuthzRepo(e) => {
+                tracing::error!(error = %e, "files admin authz repo error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    json!({ "error": "internal error" }),
+                )
+            }
+            Self::Backend(e) => {
+                tracing::error!(error = %e, "files admin backend error");
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    json!({ "error": "internal error" }),
+                )
+            }
+        };
+        (status, Json(body)).into_response()
+    }
+}

crates/manager-core/src/files_repo.rs

@@ -0,0 +1,759 @@
+//! `FilesRepo` — the metadata row (Postgres) + blob bytes (filesystem)
+//! storage layer for the v1.1.5 `files::*` SDK.
+//!
+//! Unlike KV/docs, this repo owns BOTH halves of a file: the `files`
+//! row (metadata + SHA-256 checksum) and the bytes on disk at
+//!   `<root>/files/<app_id>/<collection>/<id[0:2]>/<id>`.
+//! It owns both because the write must be atomic across them — a crash
+//! mid-write must never leave a readable half-written file.
+//!
+//! ## Atomic write protocol (`create` / `update`)
+//!   1. Validate (collection path-safety; caps live one layer up).
+//!   2. `create_dir_all` the shard dir with `0o700`.
+//!   3. SHA-256 the in-memory bytes (single pass) while writing to
+//!      `<final>.tmp.<unique>`.
+//!   4. `fsync` the temp file.
+//!   5. `rename` temp → final (atomic on POSIX).
+//!   6. `fsync` the parent dir (so the rename is durable).
+//!   7. INSERT / UPDATE the DB row.
+//!
+//! A crash between 1–5 leaves an orphan `*.tmp.*` (never read). A crash
+//! between 5–7 leaves a file with no row — never reachable via the SDK
+//! (reads start from the row). Both are reclaimed by a future orphan
+//! sweep (deferred to v1.1.6+; see HANDBACK §7).
+//!
+//! ## Atomic delete protocol
+//!   1. SELECT + DELETE the row inside one transaction; commit.
+//!   2. `unlink` the file (outside the tx). A failure here leaves an
+//!      orphan; a failure before the commit changes nothing.
+//!
+//! ## Checksum-on-read
+//! `get` reads the file, hashes it, and compares against the stored
+//! checksum — returning `FilesError::Corrupted` (and logging the path
+//! at error level) on a mismatch. It never auto-deletes; the operator
+//! decides what to do with a metadata-vs-bytes divergence.
+
+use std::env;
+use std::path::{Path, PathBuf};
+use std::sync::atomic::{AtomicU64, Ordering};
+
+use async_trait::async_trait;
+use base64::engine::general_purpose::URL_SAFE_NO_PAD;
+use base64::Engine as _;
+use chrono::{DateTime, Utc};
+use picloud_shared::{AppId, FileMeta, FileUpdate, FilesListPage, NewFile};
+use sha2::{Digest, Sha256};
+use sqlx::PgPool;
+use uuid::Uuid;
+
+/// 100 MB default per-file cap.
+pub const DEFAULT_MAX_FILE_SIZE_BYTES: usize = 100 * 1024 * 1024;
+/// Default filesystem root (relative to the process CWD).
+pub const DEFAULT_FILES_ROOT: &str = "./data";
+
+const FILES_LIST_MAX_LIMIT: u32 = 1_000;
+const FILES_LIST_DEFAULT_LIMIT: u32 = 100;
+
+/// Monotonic counter feeding unique temp-file suffixes (combined with
+/// the pid). Avoids `rand` in the storage layer per the brief.
+static TMP_COUNTER: AtomicU64 = AtomicU64::new(0);
+
+#[derive(Debug, thiserror::Error)]
+pub enum FilesRepoError {
+    #[error("database error: {0}")]
+    Db(#[from] sqlx::Error),
+
+    #[error("filesystem error: {0}")]
+    Io(String),
+
+    #[error("invalid collection name: {0}")]
+    InvalidCollection(String),
+
+    /// The bytes on disk no longer match the stored checksum (or are
+    /// missing entirely while the row persists).
+    #[error("file content corrupted (checksum mismatch)")]
+    Corrupted,
+
+    #[error("invalid pagination cursor")]
+    InvalidCursor,
+}
+
+/// Outbound-files tunables. Env-overridable following the same pattern
+/// as `HttpConfig::from_env`.
+#[derive(Debug, Clone)]
+pub struct FilesConfig {
+    pub root: PathBuf,
+    pub max_file_size_bytes: usize,
+}
+
+impl FilesConfig {
+    #[must_use]
+    pub fn conservative() -> Self {
+        Self {
+            root: PathBuf::from(DEFAULT_FILES_ROOT),
+            max_file_size_bytes: DEFAULT_MAX_FILE_SIZE_BYTES,
+        }
+    }
+
+    #[must_use]
+    pub fn from_env() -> Self {
+        let mut c = Self::conservative();
+        if let Ok(v) = env::var("PICLOUD_FILES_ROOT") {
+            if !v.trim().is_empty() {
+                c.root = PathBuf::from(v);
+            }
+        }
+        if let Ok(v) = env::var("PICLOUD_FILES_MAX_FILE_SIZE_BYTES") {
+            match v.parse::<usize>() {
+                Ok(n) => c.max_file_size_bytes = n,
+                Err(e) => {
+                    tracing::warn!(error = %e, "ignoring invalid PICLOUD_FILES_MAX_FILE_SIZE_BYTES");
+                }
+            }
+        }
+        c
+    }
+}
+
+impl Default for FilesConfig {
+    fn default() -> Self {
+        Self::conservative()
+    }
+}
+
+/// The new+prior metadata returned from a successful `update`, so the
+/// service can emit a `ServiceEvent` with the change-data-capture
+/// surface (`old_payload`).
+#[derive(Debug, Clone)]
+pub struct FileUpdated {
+    pub new: FileMeta,
+    pub prev: FileMeta,
+}
+
+#[async_trait]
+pub trait FilesRepo: Send + Sync {
+    async fn create(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        new: NewFile,
+    ) -> Result<FileMeta, FilesRepoError>;
+
+    async fn head(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+    ) -> Result<Option<FileMeta>, FilesRepoError>;
+
+    /// Reads + checksum-verifies the bytes. `Ok(None)` when no row
+    /// exists; `Err(Corrupted)` when the row exists but the bytes are
+    /// missing or mismatched.
+    async fn get(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+    ) -> Result<Option<Vec<u8>>, FilesRepoError>;
+
+    /// `Ok(None)` when no row exists (the SDK turns this into
+    /// `FilesError::NotFound`).
+    async fn update(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+        upd: FileUpdate,
+    ) -> Result<Option<FileUpdated>, FilesRepoError>;
+
+    /// Returns the deleted row's metadata if present, `None` otherwise.
+    async fn delete(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+    ) -> Result<Option<FileMeta>, FilesRepoError>;
+
+    async fn list(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        cursor: Option<&str>,
+        limit: u32,
+    ) -> Result<FilesListPage, FilesRepoError>;
+}
+
+/// Filesystem-bytes + Postgres-metadata repo.
+pub struct FsFilesRepo {
+    pool: PgPool,
+    config: FilesConfig,
+}
+
+impl FsFilesRepo {
+    #[must_use]
+    pub fn new(pool: PgPool, config: FilesConfig) -> Self {
+        Self { pool, config }
+    }
+
+    /// Defensive path-component guard. The service already validates the
+    /// collection at the SDK boundary; this is belt-and-suspenders so a
+    /// future caller can't smuggle a traversal sequence onto disk.
+    fn guard_collection(collection: &str) -> Result<(), FilesRepoError> {
+        if collection.is_empty()
+            || collection.contains('/')
+            || collection.contains('\\')
+            || collection.contains("..")
+            || collection.contains('\0')
+        {
+            return Err(FilesRepoError::InvalidCollection(collection.to_string()));
+        }
+        Ok(())
+    }
+
+    fn final_path(&self, app_id: AppId, collection: &str, id: Uuid) -> PathBuf {
+        final_path_at(&self.config.root, app_id, collection, id)
+    }
+
+    fn write_atomic(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+        bytes: &[u8],
+    ) -> Result<String, FilesRepoError> {
+        write_atomic_at(&self.config.root, app_id, collection, id, bytes)
+    }
+}
+
+fn shard_dir_at(root: &Path, app_id: AppId, collection: &str, id_str: &str) -> PathBuf {
+    root.join("files")
+        .join(app_id.into_inner().to_string())
+        .join(collection)
+        .join(&id_str[..2])
+}
+
+fn final_path_at(root: &Path, app_id: AppId, collection: &str, id: Uuid) -> PathBuf {
+    let id_str = id.to_string();
+    shard_dir_at(root, app_id, collection, &id_str).join(&id_str)
+}
+
+/// Steps 2–6 of the atomic-write protocol. Returns the lowercase hex
+/// SHA-256 of the bytes (computed in a single pass over the in-memory
+/// buffer — the file is never re-read). Free function so the fs
+/// mechanics are unit-testable without a Postgres pool.
+fn write_atomic_at(
+    root: &Path,
+    app_id: AppId,
+    collection: &str,
+    id: Uuid,
+    bytes: &[u8],
+) -> Result<String, FilesRepoError> {
+    use std::io::Write as _;
+
+    let id_str = id.to_string();
+    let dir = shard_dir_at(root, app_id, collection, &id_str);
+    create_dir_all_secure(&dir)?;
+
+    // Single-pass checksum over the in-memory buffer.
+    let mut hasher = Sha256::new();
+    hasher.update(bytes);
+    let checksum = hex_lower(&hasher.finalize());
+
+    let seq = TMP_COUNTER.fetch_add(1, Ordering::Relaxed);
+    let tmp = dir.join(format!("{id_str}.tmp.{}-{seq}", std::process::id()));
+    let final_path = dir.join(&id_str);
+
+    {
+        let mut f = std::fs::File::create(&tmp).map_err(io_err)?;
+        f.write_all(bytes).map_err(io_err)?;
+        f.sync_all().map_err(io_err)?; // fsync temp
+    }
+    std::fs::rename(&tmp, &final_path).map_err(io_err)?; // atomic
+                                                         // fsync the parent dir so the rename is durable.
+    if let Ok(dirf) = std::fs::File::open(&dir) {
+        let _ = dirf.sync_all();
+    }
+    Ok(checksum)
+}
+
+/// Read + checksum-verify the bytes at the given path-set. Free
+/// function mirror of the `get` read path. Returns `Corrupted` when the
+/// bytes are missing or don't match `expected_checksum`.
+fn read_verify_at(
+    root: &Path,
+    app_id: AppId,
+    collection: &str,
+    id: Uuid,
+    expected_checksum: &str,
+) -> Result<Vec<u8>, FilesRepoError> {
+    let path = final_path_at(root, app_id, collection, id);
+    let bytes = match std::fs::read(&path) {
+        Ok(b) => b,
+        Err(e) => {
+            tracing::error!(
+                path = %path.display(), error = %e,
+                "files: row exists but bytes are unreadable — treating as corrupted"
+            );
+            return Err(FilesRepoError::Corrupted);
+        }
+    };
+    let mut hasher = Sha256::new();
+    hasher.update(&bytes);
+    let actual = hex_lower(&hasher.finalize());
+    if actual != expected_checksum {
+        tracing::error!(
+            path = %path.display(), expected = %expected_checksum, actual = %actual,
+            "files: checksum mismatch on read — content corrupted"
+        );
+        return Err(FilesRepoError::Corrupted);
+    }
+    Ok(bytes)
+}
+
+#[async_trait]
+impl FilesRepo for FsFilesRepo {
+    async fn create(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        new: NewFile,
+    ) -> Result<FileMeta, FilesRepoError> {
+        Self::guard_collection(collection)?;
+        let id = Uuid::new_v4();
+        let size = i64::try_from(new.data.len()).unwrap_or(i64::MAX);
+
+        let checksum = self.write_atomic(app_id, collection, id, &new.data)?;
+
+        let row: FileRow = sqlx::query_as(
+            "INSERT INTO files \
+                (app_id, collection, id, name, content_type, size_bytes, checksum_sha256) \
+             VALUES ($1, $2, $3, $4, $5, $6, $7) \
+             RETURNING id, collection, name, content_type, size_bytes, \
+                       checksum_sha256, created_at, updated_at",
+        )
+        .bind(app_id.into_inner())
+        .bind(collection)
+        .bind(id)
+        .bind(&new.name)
+        .bind(&new.content_type)
+        .bind(size)
+        .bind(&checksum)
+        .fetch_one(&self.pool)
+        .await?;
+
+        Ok(row.into_meta())
+    }
+
+    async fn head(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+    ) -> Result<Option<FileMeta>, FilesRepoError> {
+        let row: Option<FileRow> = sqlx::query_as(
+            "SELECT id, collection, name, content_type, size_bytes, \
+                    checksum_sha256, created_at, updated_at \
+             FROM files WHERE app_id = $1 AND collection = $2 AND id = $3",
+        )
+        .bind(app_id.into_inner())
+        .bind(collection)
+        .bind(id)
+        .fetch_optional(&self.pool)
+        .await?;
+        Ok(row.map(FileRow::into_meta))
+    }
+
+    async fn get(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+    ) -> Result<Option<Vec<u8>>, FilesRepoError> {
+        let row: Option<(String,)> = sqlx::query_as(
+            "SELECT checksum_sha256 FROM files \
+             WHERE app_id = $1 AND collection = $2 AND id = $3",
+        )
+        .bind(app_id.into_inner())
+        .bind(collection)
+        .bind(id)
+        .fetch_optional(&self.pool)
+        .await?;
+        let Some((stored_checksum,)) = row else {
+            return Ok(None);
+        };
+        let bytes = read_verify_at(&self.config.root, app_id, collection, id, &stored_checksum)?;
+        Ok(Some(bytes))
+    }
+
+    async fn update(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+        upd: FileUpdate,
+    ) -> Result<Option<FileUpdated>, FilesRepoError> {
+        Self::guard_collection(collection)?;
+        // Read the prior row first (existence check + CDC surface).
+        let Some(prev) = self.head(app_id, collection, id).await? else {
+            return Ok(None);
+        };
+
+        let size = i64::try_from(upd.data.len()).unwrap_or(i64::MAX);
+        let checksum = self.write_atomic(app_id, collection, id, &upd.data)?;
+
+        let row: FileRow = sqlx::query_as(
+            "UPDATE files SET \
+                name = COALESCE($4, name), \
+                content_type = COALESCE($5, content_type), \
+                size_bytes = $6, \
+                checksum_sha256 = $7, \
+                updated_at = NOW() \
+             WHERE app_id = $1 AND collection = $2 AND id = $3 \
+             RETURNING id, collection, name, content_type, size_bytes, \
+                       checksum_sha256, created_at, updated_at",
+        )
+        .bind(app_id.into_inner())
+        .bind(collection)
+        .bind(id)
+        .bind(upd.name.as_deref())
+        .bind(upd.content_type.as_deref())
+        .bind(size)
+        .bind(&checksum)
+        .fetch_one(&self.pool)
+        .await?;
+
+        Ok(Some(FileUpdated {
+            new: row.into_meta(),
+            prev,
+        }))
+    }
+
+    async fn delete(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        id: Uuid,
+    ) -> Result<Option<FileMeta>, FilesRepoError> {
+        // SELECT + DELETE in one tx; unlink afterwards (outside the tx).
+        let mut tx = self.pool.begin().await?;
+        let row: Option<FileRow> = sqlx::query_as(
+            "SELECT id, collection, name, content_type, size_bytes, \
+                    checksum_sha256, created_at, updated_at \
+             FROM files WHERE app_id = $1 AND collection = $2 AND id = $3 \
+             FOR UPDATE",
+        )
+        .bind(app_id.into_inner())
+        .bind(collection)
+        .bind(id)
+        .fetch_optional(&mut *tx)
+        .await?;
+
+        let Some(row) = row else {
+            tx.rollback().await?;
+            return Ok(None);
+        };
+
+        sqlx::query("DELETE FROM files WHERE app_id = $1 AND collection = $2 AND id = $3")
+            .bind(app_id.into_inner())
+            .bind(collection)
+            .bind(id)
+            .execute(&mut *tx)
+            .await?;
+        tx.commit().await?;
+
+        // Row is gone; unlink the bytes. A failure here leaves an orphan
+        // file (reclaimed by a future sweep) — not fatal.
+        let path = self.final_path(app_id, collection, id);
+        if let Err(e) = std::fs::remove_file(&path) {
+            if e.kind() != std::io::ErrorKind::NotFound {
+                tracing::warn!(path = %path.display(), error = %e, "files: unlink after delete failed (orphan)");
+            }
+        }
+        Ok(Some(row.into_meta()))
+    }
+
+    async fn list(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        cursor: Option<&str>,
+        limit: u32,
+    ) -> Result<FilesListPage, FilesRepoError> {
+        let limit = if limit == 0 {
+            FILES_LIST_DEFAULT_LIMIT
+        } else {
+            limit.min(FILES_LIST_MAX_LIMIT)
+        };
+        let last_id = match cursor {
+            Some(c) => Some(decode_cursor(c)?),
+            None => None,
+        };
+        let take = i64::from(limit) + 1;
+        let rows: Vec<FileRow> = sqlx::query_as(
+            "SELECT id, collection, name, content_type, size_bytes, \
+                    checksum_sha256, created_at, updated_at \
+             FROM files \
+             WHERE app_id = $1 AND collection = $2 \
+               AND ($3::uuid IS NULL OR id > $3) \
+             ORDER BY id ASC \
+             LIMIT $4",
+        )
+        .bind(app_id.into_inner())
+        .bind(collection)
+        .bind(last_id)
+        .bind(take)
+        .fetch_all(&self.pool)
+        .await?;
+
+        let mut files: Vec<FileMeta> = rows.into_iter().map(FileRow::into_meta).collect();
+        let next_cursor = if files.len() > limit as usize {
+            files.truncate(limit as usize);
+            files.last().map(|m| encode_cursor(m.id))
+        } else {
+            None
+        };
+        Ok(FilesListPage { files, next_cursor })
+    }
+}
+
+// ----------------------------------------------------------------------------
+// Helpers
+// ----------------------------------------------------------------------------
+
+fn io_err(e: std::io::Error) -> FilesRepoError {
+    FilesRepoError::Io(e.to_string())
+}
+
+/// `create_dir_all` with `0o700` on the created tree (Unix). On other
+/// platforms it falls back to the default permissions.
+fn create_dir_all_secure(dir: &Path) -> Result<(), FilesRepoError> {
+    #[cfg(unix)]
+    {
+        use std::os::unix::fs::DirBuilderExt as _;
+        std::fs::DirBuilder::new()
+            .recursive(true)
+            .mode(0o700)
+            .create(dir)
+            .map_err(io_err)
+    }
+    #[cfg(not(unix))]
+    {
+        std::fs::create_dir_all(dir).map_err(io_err)
+    }
+}
+
+fn hex_lower(bytes: &[u8]) -> String {
+    let mut s = String::with_capacity(bytes.len() * 2);
+    for b in bytes {
+        use std::fmt::Write as _;
+        let _ = write!(s, "{b:02x}");
+    }
+    s
+}
+
+fn encode_cursor(last_id: Uuid) -> String {
+    URL_SAFE_NO_PAD.encode(last_id.to_string().as_bytes())
+}
+
+fn decode_cursor(cursor: &str) -> Result<Uuid, FilesRepoError> {
+    let bytes = URL_SAFE_NO_PAD
+        .decode(cursor)
+        .map_err(|_| FilesRepoError::InvalidCursor)?;
+    let s = String::from_utf8(bytes).map_err(|_| FilesRepoError::InvalidCursor)?;
+    Uuid::parse_str(&s).map_err(|_| FilesRepoError::InvalidCursor)
+}
+
+#[derive(sqlx::FromRow)]
+struct FileRow {
+    id: Uuid,
+    collection: String,
+    name: String,
+    content_type: String,
+    size_bytes: i64,
+    checksum_sha256: String,
+    created_at: DateTime<Utc>,
+    updated_at: DateTime<Utc>,
+}
+
+impl FileRow {
+    fn into_meta(self) -> FileMeta {
+        FileMeta {
+            id: self.id,
+            collection: self.collection,
+            name: self.name,
+            content_type: self.content_type,
+            size: u64::try_from(self.size_bytes).unwrap_or(0),
+            checksum: self.checksum_sha256,
+            created_at: self.created_at,
+            updated_at: self.updated_at,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn hex_lower_matches_known_sha256_vector() {
+        // SHA-256("abc") — NIST known-answer vector.
+        let mut h = Sha256::new();
+        h.update(b"abc");
+        assert_eq!(
+            hex_lower(&h.finalize()),
+            "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"
+        );
+    }
+
+    #[test]
+    fn hex_lower_of_empty_is_known_vector() {
+        let mut h = Sha256::new();
+        h.update(b"");
+        assert_eq!(
+            hex_lower(&h.finalize()),
+            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+        );
+    }
+
+    #[test]
+    fn cursor_round_trips() {
+        let id = Uuid::new_v4();
+        let enc = encode_cursor(id);
+        assert_eq!(decode_cursor(&enc).unwrap(), id);
+        assert!(matches!(
+            decode_cursor("!!not-base64!!"),
+            Err(FilesRepoError::InvalidCursor)
+        ));
+    }
+
+    #[test]
+    fn guard_collection_rejects_traversal() {
+        assert!(FsFilesRepo::guard_collection("avatars").is_ok());
+        assert!(FsFilesRepo::guard_collection("a/b").is_err());
+        assert!(FsFilesRepo::guard_collection("..").is_err());
+        assert!(FsFilesRepo::guard_collection("a..b").is_err());
+        assert!(FsFilesRepo::guard_collection("").is_err());
+        assert!(FsFilesRepo::guard_collection("a\0b").is_err());
+    }
+
+    #[test]
+    fn config_from_env_defaults_are_conservative() {
+        let c = FilesConfig::conservative();
+        assert_eq!(c.max_file_size_bytes, DEFAULT_MAX_FILE_SIZE_BYTES);
+        assert_eq!(c.root, PathBuf::from(DEFAULT_FILES_ROOT));
+    }
+
+    // ------------------------------------------------------------------
+    // Tempdir-backed filesystem mechanics — exercise the atomic write,
+    // single-pass checksum, and checksum-on-read tamper detection
+    // without needing a Postgres pool.
+    // ------------------------------------------------------------------
+
+    use picloud_shared::AppId;
+
+    /// Process-unique scratch dir under the system temp dir. Cleaned up
+    /// by each test via `remove_dir_all`.
+    fn unique_tmp_root() -> PathBuf {
+        let seq = TMP_COUNTER.fetch_add(1, Ordering::Relaxed);
+        let dir =
+            std::env::temp_dir().join(format!("picloud-files-test-{}-{seq}", std::process::id()));
+        std::fs::create_dir_all(&dir).unwrap();
+        dir
+    }
+
+    #[test]
+    fn write_atomic_then_read_verify_round_trips() {
+        let root = unique_tmp_root();
+        let app = AppId::new();
+        let id = Uuid::new_v4();
+        let bytes = b"hello picloud files".to_vec();
+
+        let checksum = write_atomic_at(&root, app, "avatars", id, &bytes).unwrap();
+        // Single-pass checksum matches an independent hash of the bytes.
+        let mut h = Sha256::new();
+        h.update(&bytes);
+        assert_eq!(checksum, hex_lower(&h.finalize()));
+
+        let read = read_verify_at(&root, app, "avatars", id, &checksum).unwrap();
+        assert_eq!(read, bytes);
+
+        std::fs::remove_dir_all(&root).ok();
+    }
+
+    #[test]
+    fn read_verify_detects_tampering_as_corrupted() {
+        let root = unique_tmp_root();
+        let app = AppId::new();
+        let id = Uuid::new_v4();
+        let checksum = write_atomic_at(&root, app, "c", id, b"original").unwrap();
+
+        // Mutate the bytes behind the repo's back.
+        let path = final_path_at(&root, app, "c", id);
+        std::fs::write(&path, b"tampered").unwrap();
+
+        let err = read_verify_at(&root, app, "c", id, &checksum).unwrap_err();
+        assert!(matches!(err, FilesRepoError::Corrupted));
+
+        std::fs::remove_dir_all(&root).ok();
+    }
+
+    #[test]
+    fn read_verify_missing_bytes_is_corrupted() {
+        let root = unique_tmp_root();
+        let app = AppId::new();
+        let id = Uuid::new_v4();
+        // No write — the file never existed.
+        let err = read_verify_at(&root, app, "c", id, "deadbeef").unwrap_err();
+        assert!(matches!(err, FilesRepoError::Corrupted));
+        std::fs::remove_dir_all(&root).ok();
+    }
+
+    #[test]
+    fn atomic_write_leaves_no_tmp_file_after_success() {
+        let root = unique_tmp_root();
+        let app = AppId::new();
+        let id = Uuid::new_v4();
+        write_atomic_at(&root, app, "c", id, b"data").unwrap();
+
+        let id_str = id.to_string();
+        let dir = shard_dir_at(&root, app, "c", &id_str);
+        let entries: Vec<_> = std::fs::read_dir(&dir)
+            .unwrap()
+            .filter_map(Result::ok)
+            .map(|e| e.file_name().to_string_lossy().into_owned())
+            .collect();
+        // Exactly the final file is visible — no `*.tmp.*` orphan.
+        assert_eq!(entries, vec![id_str]);
+        assert!(!entries.iter().any(|n| n.contains(".tmp.")));
+
+        std::fs::remove_dir_all(&root).ok();
+    }
+
+    #[test]
+    fn id_shard_uses_first_two_chars() {
+        let root = PathBuf::from("/tmp/x");
+        let app = AppId::new();
+        let id = Uuid::new_v4();
+        let id_str = id.to_string();
+        let path = final_path_at(&root, app, "col", id);
+        let shard = &id_str[..2];
+        assert!(path
+            .to_string_lossy()
+            .contains(&format!("/col/{shard}/{id_str}")));
+    }
+
+    #[cfg(unix)]
+    #[test]
+    fn shard_tree_created_with_0700() {
+        use std::os::unix::fs::PermissionsExt as _;
+        let root = unique_tmp_root();
+        let app = AppId::new();
+        let id = Uuid::new_v4();
+        write_atomic_at(&root, app, "c", id, b"data").unwrap();
+        let id_str = id.to_string();
+        let dir = shard_dir_at(&root, app, "c", &id_str);
+        let mode = std::fs::metadata(&dir).unwrap().permissions().mode();
+        assert_eq!(mode & 0o777, 0o700, "shard dir should be 0o700");
+        std::fs::remove_dir_all(&root).ok();
+    }
+}

crates/manager-core/src/files_service.rs

@@ -0,0 +1,817 @@
+//! `FilesServiceImpl` — wires the `FilesRepo` underneath the
+//! `picloud_shared::FilesService` trait scripts see via the Rhai
+//! bridge.
+//!
+//! Layers added here (vs the raw repo), mirroring `KvServiceImpl`:
+//!   1. Collection validation (empty + path-traversal) and field /
+//!      size-cap validation at the SDK boundary.
+//!   2. **Script-as-gate authz**: when `cx.principal.is_some()` we run
+//!      `authz::require(...)`; when it's `None` (public HTTP) we skip.
+//!      Cross-app isolation is unaffected — every repo call is keyed by
+//!      `cx.app_id`, never an argument.
+//!   3. `ServiceEvent` emission after each mutation (`create` /
+//!      `update` / `delete`). The payload is the file **metadata**, not
+//!      the blob bytes (files are too big for trigger payloads).
+
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use picloud_shared::{
+    validate_files_collection, FileMeta, FileUpdate, FilesError, FilesListPage, FilesService,
+    NewFile, SdkCallCx, ServiceEvent, ServiceEventEmitter,
+};
+use uuid::Uuid;
+
+use crate::authz::{self, AuthzRepo, Capability};
+use crate::files_repo::{FileUpdated, FilesRepo, FilesRepoError};
+
+pub struct FilesServiceImpl {
+    repo: Arc<dyn FilesRepo>,
+    authz: Arc<dyn AuthzRepo>,
+    events: Arc<dyn ServiceEventEmitter>,
+    max_file_size_bytes: usize,
+}
+
+impl FilesServiceImpl {
+    #[must_use]
+    pub fn new(
+        repo: Arc<dyn FilesRepo>,
+        authz: Arc<dyn AuthzRepo>,
+        events: Arc<dyn ServiceEventEmitter>,
+        max_file_size_bytes: usize,
+    ) -> Self {
+        Self {
+            repo,
+            authz,
+            events,
+            max_file_size_bytes,
+        }
+    }
+
+    async fn check_read(&self, cx: &SdkCallCx) -> Result<(), FilesError> {
+        if let Some(ref principal) = cx.principal {
+            authz::require(&*self.authz, principal, Capability::AppFilesRead(cx.app_id))
+                .await
+                .map_err(|_| FilesError::Forbidden)?;
+        }
+        Ok(())
+    }
+
+    async fn check_write(&self, cx: &SdkCallCx) -> Result<(), FilesError> {
+        if let Some(ref principal) = cx.principal {
+            authz::require(
+                &*self.authz,
+                principal,
+                Capability::AppFilesWrite(cx.app_id),
+            )
+            .await
+            .map_err(|_| FilesError::Forbidden)?;
+        }
+        Ok(())
+    }
+
+    /// Best-effort `ServiceEvent` emission. A failed emit is logged but
+    /// never rolls back the (already-durable) file write.
+    async fn emit(
+        &self,
+        cx: &SdkCallCx,
+        op: &'static str,
+        collection: &str,
+        meta: &FileMeta,
+        old: Option<&FileMeta>,
+    ) {
+        let payload = serde_json::to_value(meta).ok();
+        let old_payload = old.and_then(|m| serde_json::to_value(m).ok());
+        if let Err(e) = self
+            .events
+            .emit(
+                cx,
+                ServiceEvent {
+                    source: "files",
+                    op,
+                    collection: Some(collection.to_string()),
+                    key: Some(meta.id.to_string()),
+                    payload,
+                    old_payload,
+                },
+            )
+            .await
+        {
+            tracing::warn!(error = %e, source = "files", op, "event emit failed");
+        }
+    }
+}
+
+/// Parse a script-supplied id. Invalid UUIDs aren't an error shape the
+/// SDK exposes — for reads/deletes they simply mean "no such file".
+fn parse_id(id: &str) -> Option<Uuid> {
+    Uuid::parse_str(id).ok()
+}
+
+impl From<FilesRepoError> for FilesError {
+    fn from(e: FilesRepoError) -> Self {
+        match e {
+            FilesRepoError::Corrupted => Self::Corrupted,
+            FilesRepoError::InvalidCollection(c) => Self::InvalidCollection(c),
+            other => Self::Backend(other.to_string()),
+        }
+    }
+}
+
+#[async_trait]
+impl FilesService for FilesServiceImpl {
+    async fn create(
+        &self,
+        cx: &SdkCallCx,
+        collection: &str,
+        new: NewFile,
+    ) -> Result<Uuid, FilesError> {
+        validate_files_collection(collection)?;
+        self.check_write(cx).await?;
+        new.validate(self.max_file_size_bytes)?;
+        let meta = self.repo.create(cx.app_id, collection, new).await?;
+        self.emit(cx, "create", collection, &meta, None).await;
+        Ok(meta.id)
+    }
+
+    async fn head(
+        &self,
+        cx: &SdkCallCx,
+        collection: &str,
+        id: &str,
+    ) -> Result<Option<FileMeta>, FilesError> {
+        validate_files_collection(collection)?;
+        self.check_read(cx).await?;
+        let Some(uuid) = parse_id(id) else {
+            return Ok(None);
+        };
+        Ok(self.repo.head(cx.app_id, collection, uuid).await?)
+    }
+
+    async fn get(
+        &self,
+        cx: &SdkCallCx,
+        collection: &str,
+        id: &str,
+    ) -> Result<Option<Vec<u8>>, FilesError> {
+        validate_files_collection(collection)?;
+        self.check_read(cx).await?;
+        let Some(uuid) = parse_id(id) else {
+            return Ok(None);
+        };
+        Ok(self.repo.get(cx.app_id, collection, uuid).await?)
+    }
+
+    async fn update(
+        &self,
+        cx: &SdkCallCx,
+        collection: &str,
+        id: &str,
+        upd: FileUpdate,
+    ) -> Result<(), FilesError> {
+        validate_files_collection(collection)?;
+        self.check_write(cx).await?;
+        upd.validate(self.max_file_size_bytes)?;
+        let Some(uuid) = parse_id(id) else {
+            return Err(FilesError::NotFound);
+        };
+        match self.repo.update(cx.app_id, collection, uuid, upd).await? {
+            Some(FileUpdated { new, prev }) => {
+                self.emit(cx, "update", collection, &new, Some(&prev)).await;
+                Ok(())
+            }
+            None => Err(FilesError::NotFound),
+        }
+    }
+
+    async fn delete(&self, cx: &SdkCallCx, collection: &str, id: &str) -> Result<bool, FilesError> {
+        validate_files_collection(collection)?;
+        self.check_write(cx).await?;
+        let Some(uuid) = parse_id(id) else {
+            return Ok(false);
+        };
+        match self.repo.delete(cx.app_id, collection, uuid).await? {
+            Some(meta) => {
+                // On delete, the top-level metadata AND `prev` both carry
+                // the deleted row (per docs/v1.1.x design + the brief).
+                self.emit(cx, "delete", collection, &meta, Some(&meta))
+                    .await;
+                Ok(true)
+            }
+            None => Ok(false),
+        }
+    }
+
+    async fn list(
+        &self,
+        cx: &SdkCallCx,
+        collection: &str,
+        cursor: Option<&str>,
+        limit: u32,
+    ) -> Result<FilesListPage, FilesError> {
+        validate_files_collection(collection)?;
+        self.check_read(cx).await?;
+        Ok(self.repo.list(cx.app_id, collection, cursor, limit).await?)
+    }
+}
+
+// ----------------------------------------------------------------------------
+// Tests — in-memory FilesRepo so unit tests need neither Postgres nor a
+// filesystem. The on-disk atomic-write / checksum mechanics are covered
+// by the tempdir tests in `files_repo.rs`.
+// ----------------------------------------------------------------------------
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::authz::{AuthzError, AuthzRepo};
+    use async_trait::async_trait;
+    use chrono::Utc;
+    use picloud_shared::{
+        AdminUserId, AppId, AppRole, EmitError, ExecutionId, InstanceRole, Principal, RequestId,
+        ScriptId, ServiceEvent, UserId,
+    };
+    use std::collections::BTreeMap;
+    use std::sync::Mutex as StdMutex;
+    use tokio::sync::Mutex;
+
+    /// In-memory FilesRepo keyed by (app, collection, id). Stores the
+    /// metadata + bytes together so cross-app isolation and round-trips
+    /// can be checked without disk.
+    #[derive(Default)]
+    struct InMemoryFilesRepo {
+        #[allow(clippy::type_complexity)]
+        data: Mutex<BTreeMap<(AppId, String, Uuid), (FileMeta, Vec<u8>)>>,
+    }
+
+    fn sha256_hex(bytes: &[u8]) -> String {
+        use sha2::{Digest, Sha256};
+        let mut h = Sha256::new();
+        h.update(bytes);
+        let out = h.finalize();
+        let mut s = String::new();
+        for b in out {
+            use std::fmt::Write as _;
+            let _ = write!(s, "{b:02x}");
+        }
+        s
+    }
+
+    #[async_trait]
+    impl FilesRepo for InMemoryFilesRepo {
+        async fn create(
+            &self,
+            app_id: AppId,
+            collection: &str,
+            new: NewFile,
+        ) -> Result<FileMeta, FilesRepoError> {
+            let id = Uuid::new_v4();
+            let now = Utc::now();
+            let meta = FileMeta {
+                id,
+                collection: collection.to_string(),
+                name: new.name.clone(),
+                content_type: new.content_type.clone(),
+                size: new.data.len() as u64,
+                checksum: sha256_hex(&new.data),
+                created_at: now,
+                updated_at: now,
+            };
+            self.data.lock().await.insert(
+                (app_id, collection.to_string(), id),
+                (meta.clone(), new.data),
+            );
+            Ok(meta)
+        }
+
+        async fn head(
+            &self,
+            app_id: AppId,
+            collection: &str,
+            id: Uuid,
+        ) -> Result<Option<FileMeta>, FilesRepoError> {
+            Ok(self
+                .data
+                .lock()
+                .await
+                .get(&(app_id, collection.to_string(), id))
+                .map(|(m, _)| m.clone()))
+        }
+
+        async fn get(
+            &self,
+            app_id: AppId,
+            collection: &str,
+            id: Uuid,
+        ) -> Result<Option<Vec<u8>>, FilesRepoError> {
+            Ok(self
+                .data
+                .lock()
+                .await
+                .get(&(app_id, collection.to_string(), id))
+                .map(|(_, b)| b.clone()))
+        }
+
+        async fn update(
+            &self,
+            app_id: AppId,
+            collection: &str,
+            id: Uuid,
+            upd: FileUpdate,
+        ) -> Result<Option<FileUpdated>, FilesRepoError> {
+            let mut data = self.data.lock().await;
+            let key = (app_id, collection.to_string(), id);
+            let Some((prev_meta, _)) = data.get(&key).cloned() else {
+                return Ok(None);
+            };
+            let now = Utc::now();
+            let new_meta = FileMeta {
+                id,
+                collection: collection.to_string(),
+                name: upd.name.clone().unwrap_or_else(|| prev_meta.name.clone()),
+                content_type: upd
+                    .content_type
+                    .clone()
+                    .unwrap_or_else(|| prev_meta.content_type.clone()),
+                size: upd.data.len() as u64,
+                checksum: sha256_hex(&upd.data),
+                created_at: prev_meta.created_at,
+                updated_at: now,
+            };
+            data.insert(key, (new_meta.clone(), upd.data));
+            Ok(Some(FileUpdated {
+                new: new_meta,
+                prev: prev_meta,
+            }))
+        }
+
+        async fn delete(
+            &self,
+            app_id: AppId,
+            collection: &str,
+            id: Uuid,
+        ) -> Result<Option<FileMeta>, FilesRepoError> {
+            Ok(self
+                .data
+                .lock()
+                .await
+                .remove(&(app_id, collection.to_string(), id))
+                .map(|(m, _)| m))
+        }
+
+        async fn list(
+            &self,
+            app_id: AppId,
+            collection: &str,
+            cursor: Option<&str>,
+            limit: u32,
+        ) -> Result<FilesListPage, FilesRepoError> {
+            let data = self.data.lock().await;
+            let after = cursor.and_then(|c| Uuid::parse_str(c).ok());
+            let mut metas: Vec<FileMeta> = data
+                .iter()
+                .filter(|((a, c, _), _)| *a == app_id && c == collection)
+                .map(|(_, (m, _))| m.clone())
+                .filter(|m| after.is_none_or(|a| m.id > a))
+                .collect();
+            metas.sort_by_key(|m| m.id);
+            let take = (limit.max(1)) as usize;
+            let next_cursor = if metas.len() > take {
+                metas.truncate(take);
+                metas.last().map(|m| m.id.to_string())
+            } else {
+                None
+            };
+            Ok(FilesListPage {
+                files: metas,
+                next_cursor,
+            })
+        }
+    }
+
+    /// Captures emitted events so tests can assert on fan-out shape.
+    #[derive(Default)]
+    struct CapturingEmitter {
+        events: StdMutex<Vec<ServiceEvent>>,
+    }
+
+    #[async_trait]
+    impl ServiceEventEmitter for CapturingEmitter {
+        async fn emit(&self, _cx: &SdkCallCx, event: ServiceEvent) -> Result<(), EmitError> {
+            self.events.lock().unwrap().push(event);
+            Ok(())
+        }
+    }
+
+    #[derive(Default)]
+    struct DenyingAuthzRepo;
+    #[async_trait]
+    impl AuthzRepo for DenyingAuthzRepo {
+        async fn membership(
+            &self,
+            _user_id: UserId,
+            _app_id: AppId,
+        ) -> Result<Option<AppRole>, AuthzError> {
+            Ok(None)
+        }
+    }
+
+    #[derive(Default)]
+    struct EditorAuthzRepo;
+    #[async_trait]
+    impl AuthzRepo for EditorAuthzRepo {
+        async fn membership(
+            &self,
+            _user_id: UserId,
+            _app_id: AppId,
+        ) -> Result<Option<AppRole>, AuthzError> {
+            Ok(Some(AppRole::Editor))
+        }
+    }
+
+    fn anon_cx(app_id: AppId) -> SdkCallCx {
+        SdkCallCx {
+            app_id,
+            script_id: ScriptId::new(),
+            principal: None,
+            execution_id: ExecutionId::new(),
+            request_id: RequestId::new(),
+            trigger_depth: 0,
+            root_execution_id: ExecutionId::new(),
+            is_dead_letter_handler: false,
+            event: None,
+        }
+    }
+
+    fn member_cx(app_id: AppId) -> SdkCallCx {
+        SdkCallCx {
+            principal: Some(Principal {
+                user_id: AdminUserId::new(),
+                instance_role: InstanceRole::Member,
+                scopes: None,
+                app_binding: None,
+            }),
+            ..anon_cx(app_id)
+        }
+    }
+
+    fn svc_with(authz: Arc<dyn AuthzRepo>, emitter: Arc<CapturingEmitter>) -> FilesServiceImpl {
+        FilesServiceImpl::new(
+            Arc::new(InMemoryFilesRepo::default()),
+            authz,
+            emitter,
+            10 * 1024 * 1024,
+        )
+    }
+
+    fn svc() -> FilesServiceImpl {
+        svc_with(
+            Arc::new(DenyingAuthzRepo),
+            Arc::new(CapturingEmitter::default()),
+        )
+    }
+
+    fn new_file(name: &str, data: &[u8]) -> NewFile {
+        NewFile {
+            name: name.to_string(),
+            content_type: "application/octet-stream".to_string(),
+            data: data.to_vec(),
+        }
+    }
+
+    #[tokio::test]
+    async fn create_then_get_head_round_trips() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let id = files
+            .create(&cx, "avatars", new_file("a.bin", b"hello"))
+            .await
+            .unwrap();
+        let bytes = files.get(&cx, "avatars", &id.to_string()).await.unwrap();
+        assert_eq!(bytes, Some(b"hello".to_vec()));
+        let meta = files
+            .head(&cx, "avatars", &id.to_string())
+            .await
+            .unwrap()
+            .unwrap();
+        assert_eq!(meta.name, "a.bin");
+        assert_eq!(meta.size, 5);
+        assert_eq!(meta.checksum, sha256_hex(b"hello"));
+    }
+
+    #[tokio::test]
+    async fn get_and_head_missing_return_none() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let missing = Uuid::new_v4().to_string();
+        assert_eq!(files.get(&cx, "c", &missing).await.unwrap(), None);
+        assert!(files.head(&cx, "c", &missing).await.unwrap().is_none());
+        // Non-UUID id is also "missing", not an error.
+        assert_eq!(files.get(&cx, "c", "not-a-uuid").await.unwrap(), None);
+    }
+
+    #[tokio::test]
+    async fn update_replaces_content_and_keeps_metadata_when_omitted() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let id = files
+            .create(&cx, "c", new_file("v1.txt", b"one"))
+            .await
+            .unwrap();
+        files
+            .update(
+                &cx,
+                "c",
+                &id.to_string(),
+                FileUpdate {
+                    data: b"two!!".to_vec(),
+                    name: None,
+                    content_type: None,
+                },
+            )
+            .await
+            .unwrap();
+        let meta = files
+            .head(&cx, "c", &id.to_string())
+            .await
+            .unwrap()
+            .unwrap();
+        assert_eq!(meta.name, "v1.txt"); // kept
+        assert_eq!(meta.size, 5);
+        assert_eq!(
+            files.get(&cx, "c", &id.to_string()).await.unwrap(),
+            Some(b"two!!".to_vec())
+        );
+    }
+
+    #[tokio::test]
+    async fn update_missing_throws_not_found() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let err = files
+            .update(
+                &cx,
+                "c",
+                &Uuid::new_v4().to_string(),
+                FileUpdate {
+                    data: b"x".to_vec(),
+                    name: None,
+                    content_type: None,
+                },
+            )
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::NotFound));
+    }
+
+    #[tokio::test]
+    async fn delete_returns_was_present() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let id = files.create(&cx, "c", new_file("f", b"x")).await.unwrap();
+        assert!(files.delete(&cx, "c", &id.to_string()).await.unwrap());
+        assert!(!files.delete(&cx, "c", &id.to_string()).await.unwrap());
+        assert!(!files.delete(&cx, "c", "not-a-uuid").await.unwrap());
+    }
+
+    #[tokio::test]
+    async fn empty_collection_rejected() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let err = files
+            .create(&cx, "", new_file("f", b"x"))
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::InvalidCollection(_)));
+    }
+
+    #[tokio::test]
+    async fn traversal_collection_rejected() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        for bad in ["../etc", "a/b", "a..b", "x\0y"] {
+            let err = files
+                .create(&cx, bad, new_file("f", b"x"))
+                .await
+                .unwrap_err();
+            assert!(
+                matches!(err, FilesError::InvalidCollection(_)),
+                "expected reject for {bad:?}"
+            );
+        }
+    }
+
+    #[tokio::test]
+    async fn missing_required_fields_have_field_specific_messages() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        // name
+        let err = files
+            .create(
+                &cx,
+                "c",
+                NewFile {
+                    name: "  ".into(),
+                    content_type: "text/plain".into(),
+                    data: b"x".to_vec(),
+                },
+            )
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::MissingField("name")));
+        // content_type
+        let err = files
+            .create(
+                &cx,
+                "c",
+                NewFile {
+                    name: "f".into(),
+                    content_type: String::new(),
+                    data: b"x".to_vec(),
+                },
+            )
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::MissingField("content_type")));
+        // data
+        let err = files
+            .create(
+                &cx,
+                "c",
+                NewFile {
+                    name: "f".into(),
+                    content_type: "text/plain".into(),
+                    data: vec![],
+                },
+            )
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::MissingField("data")));
+    }
+
+    #[tokio::test]
+    async fn name_and_content_type_length_caps_enforced() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        let long_name = "x".repeat(256);
+        let err = files
+            .create(&cx, "c", new_file(&long_name, b"x"))
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::NameTooLong(256)));
+
+        let err = files
+            .create(
+                &cx,
+                "c",
+                NewFile {
+                    name: "f".into(),
+                    content_type: "x".repeat(128),
+                    data: b"x".to_vec(),
+                },
+            )
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::ContentTypeTooLong(128)));
+    }
+
+    #[tokio::test]
+    async fn per_file_size_cap_enforced() {
+        let files = FilesServiceImpl::new(
+            Arc::new(InMemoryFilesRepo::default()),
+            Arc::new(DenyingAuthzRepo),
+            Arc::new(CapturingEmitter::default()),
+            8, // tiny cap
+        );
+        let cx = anon_cx(AppId::new());
+        let err = files
+            .create(&cx, "c", new_file("big", b"123456789"))
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::TooLarge { limit: 8, .. }));
+    }
+
+    #[tokio::test]
+    async fn cross_app_isolation() {
+        let files = svc();
+        let app_a = AppId::new();
+        let app_b = AppId::new();
+        let cx_a = anon_cx(app_a);
+        let cx_b = anon_cx(app_b);
+        let id = files
+            .create(&cx_a, "shared", new_file("f", b"from-a"))
+            .await
+            .unwrap();
+        // app B cannot see app A's file by id.
+        assert_eq!(
+            files.get(&cx_b, "shared", &id.to_string()).await.unwrap(),
+            None
+        );
+        assert!(files
+            .head(&cx_b, "shared", &id.to_string())
+            .await
+            .unwrap()
+            .is_none());
+        let page_b = files.list(&cx_b, "shared", None, 100).await.unwrap();
+        assert!(page_b.files.is_empty());
+        // app A still sees it.
+        assert!(files
+            .get(&cx_a, "shared", &id.to_string())
+            .await
+            .unwrap()
+            .is_some());
+    }
+
+    #[tokio::test]
+    async fn anonymous_cx_skips_authz() {
+        let files = svc(); // DenyingAuthzRepo
+        let cx = anon_cx(AppId::new());
+        // No principal → no authz check, even with a denying repo.
+        files.create(&cx, "c", new_file("f", b"x")).await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn member_without_role_is_forbidden() {
+        let files = svc(); // DenyingAuthzRepo
+        let cx = member_cx(AppId::new());
+        let err = files
+            .create(&cx, "c", new_file("f", b"x"))
+            .await
+            .unwrap_err();
+        assert!(matches!(err, FilesError::Forbidden));
+    }
+
+    #[tokio::test]
+    async fn member_with_editor_role_allowed() {
+        let files = svc_with(
+            Arc::new(EditorAuthzRepo),
+            Arc::new(CapturingEmitter::default()),
+        );
+        let cx = member_cx(AppId::new());
+        files.create(&cx, "c", new_file("f", b"x")).await.unwrap();
+    }
+
+    #[tokio::test]
+    async fn mutations_emit_events_with_correct_prev() {
+        let emitter = Arc::new(CapturingEmitter::default());
+        let files = svc_with(Arc::new(DenyingAuthzRepo), emitter.clone());
+        let cx = anon_cx(AppId::new());
+
+        let id = files.create(&cx, "c", new_file("f", b"one")).await.unwrap();
+        files
+            .update(
+                &cx,
+                "c",
+                &id.to_string(),
+                FileUpdate {
+                    data: b"two".to_vec(),
+                    name: None,
+                    content_type: None,
+                },
+            )
+            .await
+            .unwrap();
+        files.delete(&cx, "c", &id.to_string()).await.unwrap();
+
+        let events = emitter.events.lock().unwrap();
+        assert_eq!(events.len(), 3);
+        // create: prev is None
+        assert_eq!(events[0].op, "create");
+        assert_eq!(events[0].source, "files");
+        assert!(events[0].old_payload.is_none());
+        assert!(events[0].payload.is_some());
+        // update: prev is the prior metadata
+        assert_eq!(events[1].op, "update");
+        assert!(events[1].old_payload.is_some());
+        // delete: prev is the deleted metadata (payload == old_payload)
+        assert_eq!(events[2].op, "delete");
+        assert_eq!(events[2].payload, events[2].old_payload);
+        assert!(events[2].payload.is_some());
+    }
+
+    #[tokio::test]
+    async fn list_cursor_paginates() {
+        let files = svc();
+        let cx = anon_cx(AppId::new());
+        for i in 0..5 {
+            files
+                .create(&cx, "c", new_file(&format!("f{i}"), b"x"))
+                .await
+                .unwrap();
+        }
+        let p1 = files.list(&cx, "c", None, 2).await.unwrap();
+        assert_eq!(p1.files.len(), 2);
+        assert!(p1.next_cursor.is_some());
+        let p2 = files
+            .list(&cx, "c", p1.next_cursor.as_deref(), 2)
+            .await
+            .unwrap();
+        assert_eq!(p2.files.len(), 2);
+        let p3 = files
+            .list(&cx, "c", p2.next_cursor.as_deref(), 2)
+            .await
+            .unwrap();
+        assert_eq!(p3.files.len(), 1);
+        assert!(p3.next_cursor.is_none());
+    }
+}

crates/manager-core/src/lib.rs

@@ -30,6 +30,9 @@ pub mod dispatcher;
 pub mod docs_filter;
 pub mod docs_repo;
 pub mod docs_service;
+pub mod files_api;
+pub mod files_repo;
+pub mod files_service;
 pub mod gc;
 pub mod http_service;
 pub mod kv_repo;
@@ -96,6 +99,9 @@ pub use dead_letters_api::{dead_letters_router, DeadLettersApiError, DeadLetters
 pub use dispatcher::{compute_backoff, Dispatcher, DispatcherError};
 pub use docs_repo::{DocsRepo, DocsRepoError, PostgresDocsRepo};
 pub use docs_service::DocsServiceImpl;
+pub use files_api::{files_admin_router, FilesAdminState};
+pub use files_repo::{FilesConfig, FilesRepo, FilesRepoError, FsFilesRepo};
+pub use files_service::FilesServiceImpl;
 pub use gc::{spawn_abandoned_gc, spawn_dead_letter_gc};
 pub use http_service::{HttpConfig, HttpServiceImpl};
 pub use kv_repo::{KvRepo, KvRepoError, PostgresKvRepo};
@@ -116,8 +122,9 @@ pub use route_repo::{NewRoute, PostgresRouteRepository, RouteRepository};
 pub use sandbox::{CeilingError, SandboxCeiling};
 pub use trigger_config::{BackoffShape, TriggerConfig};
 pub use trigger_repo::{
-    collection_matches, CreateDeadLetterTrigger, CreateDocsTrigger, CreateKvTrigger,
-    DeadLetterTriggerMatch, DocsTriggerMatch, KvTriggerMatch, PostgresTriggerRepo, Trigger,
-    TriggerDetails, TriggerDispatchMode, TriggerKind, TriggerRepo, TriggerRepoError,
+    collection_matches, CreateDeadLetterTrigger, CreateDocsTrigger, CreateFilesTrigger,
+    CreateKvTrigger, DeadLetterTriggerMatch, DocsTriggerMatch, FilesTriggerMatch, KvTriggerMatch,
+    PostgresTriggerRepo, Trigger, TriggerDetails, TriggerDispatchMode, TriggerKind, TriggerRepo,
+    TriggerRepoError,
 };
 pub use triggers_api::{triggers_router, TriggersApiError, TriggersState};

crates/manager-core/src/outbox_event_emitter.rs

@@ -19,7 +19,8 @@ use std::sync::Arc;
 
 use async_trait::async_trait;
 use picloud_shared::{
-    DocsEventOp, EmitError, KvEventOp, SdkCallCx, ServiceEvent, ServiceEventEmitter, TriggerEvent,
+    DocsEventOp, EmitError, FileMeta, FilesEventOp, KvEventOp, SdkCallCx, ServiceEvent,
+    ServiceEventEmitter, TriggerEvent,
 };
 
 use crate::outbox_repo::{NewOutboxRow, OutboxRepo, OutboxSourceKind};
@@ -43,6 +44,7 @@ impl ServiceEventEmitter for OutboxEventEmitter {
         match event.source {
             "kv" => self.emit_kv(cx, event).await,
             "docs" => self.emit_docs(cx, event).await,
+            "files" => self.emit_files(cx, event).await,
             // Future sources land here. For now, silently drop — the
             // SDK calls `events.emit(...)` unconditionally for forward
             // compat, so swallowing without an error is correct.
@@ -154,4 +156,68 @@ impl OutboxEventEmitter {
         }
         Ok(())
     }
+
+    /// v1.1.5. Fan out a files mutation across matching files triggers.
+    /// The `ServiceEvent.payload` is the file **metadata** (never the
+    /// blob bytes); `old_payload` is the prior metadata (the deleted
+    /// row's metadata on delete). The `TriggerEvent::Files` carries the
+    /// metadata fields explicitly + `prev` for the change-data-capture
+    /// surface.
+    async fn emit_files(&self, cx: &SdkCallCx, event: ServiceEvent) -> Result<(), EmitError> {
+        let Some(op) = FilesEventOp::from_wire(event.op) else {
+            return Ok(());
+        };
+        let Some(collection) = event.collection.clone() else {
+            return Ok(());
+        };
+        // The payload is the FileMeta JSON the FilesServiceImpl emitted.
+        let Some(meta) = event
+            .payload
+            .clone()
+            .and_then(|v| serde_json::from_value::<FileMeta>(v).ok())
+        else {
+            return Ok(());
+        };
+
+        let matches = self
+            .triggers
+            .list_matching_files(cx.app_id, &collection, op)
+            .await
+            .map_err(|e| EmitError::Unavailable(format!("trigger lookup: {e}")))?;
+
+        if matches.is_empty() {
+            return Ok(());
+        }
+
+        let trigger_event = TriggerEvent::Files {
+            op,
+            collection,
+            id: meta.id.to_string(),
+            name: meta.name,
+            content_type: meta.content_type,
+            size: meta.size,
+            checksum: meta.checksum,
+            prev: event.old_payload.clone(),
+        };
+        let payload = serde_json::to_value(&trigger_event)
+            .map_err(|e| EmitError::Rejected(format!("event serialize: {e}")))?;
+
+        for m in matches {
+            self.outbox
+                .insert(NewOutboxRow {
+                    app_id: cx.app_id,
+                    source_kind: OutboxSourceKind::Files,
+                    trigger_id: Some(m.trigger_id),
+                    script_id: Some(m.script_id),
+                    reply_to: None,
+                    payload: payload.clone(),
+                    origin_principal: cx.principal.as_ref().map(|p| p.user_id),
+                    trigger_depth: cx.trigger_depth.saturating_add(1),
+                    root_execution_id: Some(cx.root_execution_id),
+                })
+                .await
+                .map_err(|e| EmitError::Unavailable(format!("outbox insert: {e}")))?;
+        }
+        Ok(())
+    }
 }

crates/manager-core/src/outbox_repo.rs

@@ -27,6 +27,8 @@ pub enum OutboxSourceKind {
     DeadLetter,
     /// v1.1.4.
     Cron,
+    /// v1.1.5.
+    Files,
 }
 
 impl OutboxSourceKind {
@@ -38,6 +40,7 @@ impl OutboxSourceKind {
             Self::Docs => "docs",
             Self::DeadLetter => "dead_letter",
             Self::Cron => "cron",
+            Self::Files => "files",
         }
     }
 
@@ -49,6 +52,7 @@ impl OutboxSourceKind {
             "docs" => Some(Self::Docs),
             "dead_letter" => Some(Self::DeadLetter),
             "cron" => Some(Self::Cron),
+            "files" => Some(Self::Files),
             _ => None,
         }
     }

crates/manager-core/src/trigger_repo.rs

@@ -5,7 +5,9 @@
 
 use async_trait::async_trait;
 use chrono::{DateTime, Utc};
-use picloud_shared::{AdminUserId, AppId, DocsEventOp, KvEventOp, ScriptId, TriggerId};
+use picloud_shared::{
+    AdminUserId, AppId, DocsEventOp, FilesEventOp, KvEventOp, ScriptId, TriggerId,
+};
 use serde::{Deserialize, Serialize};
 use sqlx::PgPool;
 use uuid::Uuid;
@@ -51,6 +53,8 @@ pub enum TriggerKind {
     DeadLetter,
     /// v1.1.4.
     Cron,
+    /// v1.1.5.
+    Files,
 }
 
 impl TriggerKind {
@@ -61,6 +65,7 @@ impl TriggerKind {
             Self::Docs => "docs",
             Self::DeadLetter => "dead_letter",
             Self::Cron => "cron",
+            Self::Files => "files",
         }
     }
 
@@ -71,6 +76,7 @@ impl TriggerKind {
             "docs" => Some(Self::Docs),
             "dead_letter" => Some(Self::DeadLetter),
             "cron" => Some(Self::Cron),
+            "files" => Some(Self::Files),
             _ => None,
         }
     }
@@ -120,6 +126,11 @@ pub enum TriggerDetails {
         #[serde(default, skip_serializing_if = "Option::is_none")]
         last_fired_at: Option<DateTime<Utc>>,
     },
+    /// v1.1.5. Same shape as KV/docs: a collection glob + op subset.
+    Files {
+        collection_glob: String,
+        ops: Vec<FilesEventOp>,
+    },
 }
 
 /// Create payload for a KV trigger. Defaults applied at the admin
@@ -175,6 +186,33 @@ pub struct CreateCronTrigger {
     pub registered_by_principal: AdminUserId,
 }
 
+/// Create payload for a files trigger (v1.1.5). Same shape as KV with
+/// `FilesEventOp` ops.
+#[derive(Debug, Clone)]
+pub struct CreateFilesTrigger {
+    pub script_id: ScriptId,
+    pub collection_glob: String,
+    pub ops: Vec<FilesEventOp>,
+    pub dispatch_mode: TriggerDispatchMode,
+    pub retry_max_attempts: u32,
+    pub retry_backoff: BackoffShape,
+    pub retry_base_ms: u32,
+    pub registered_by_principal: AdminUserId,
+}
+
+/// One match for the dispatcher's files trigger fan-out lookup
+/// (v1.1.5). Same shape as `KvTriggerMatch`.
+#[derive(Debug, Clone)]
+pub struct FilesTriggerMatch {
+    pub trigger_id: TriggerId,
+    pub script_id: ScriptId,
+    pub dispatch_mode: TriggerDispatchMode,
+    pub retry_max_attempts: u32,
+    pub retry_backoff: BackoffShape,
+    pub retry_base_ms: u32,
+    pub registered_by_principal: AdminUserId,
+}
+
 /// One match for the dispatcher's "which KV triggers fire on this
 /// event" lookup. Carries everything the dispatcher needs to construct
 /// the outbox row.
@@ -242,6 +280,13 @@ pub trait TriggerRepo: Send + Sync {
         req: CreateCronTrigger,
     ) -> Result<Trigger, TriggerRepoError>;
 
+    /// v1.1.5.
+    async fn create_files_trigger(
+        &self,
+        app_id: AppId,
+        req: CreateFilesTrigger,
+    ) -> Result<Trigger, TriggerRepoError>;
+
     async fn list_for_app(&self, app_id: AppId) -> Result<Vec<Trigger>, TriggerRepoError>;
 
     async fn get(&self, id: TriggerId) -> Result<Option<Trigger>, TriggerRepoError>;
@@ -269,6 +314,16 @@ pub trait TriggerRepo: Send + Sync {
         op: DocsEventOp,
     ) -> Result<Vec<DocsTriggerMatch>, TriggerRepoError>;
 
+    /// Dispatcher hot path for files fan-out (v1.1.5). Mirrors the KV
+    /// fan-out logic: pull every enabled files trigger, filter glob +
+    /// ops in Rust (empty ops array means "any op").
+    async fn list_matching_files(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        op: FilesEventOp,
+    ) -> Result<Vec<FilesTriggerMatch>, TriggerRepoError>;
+
     /// Dispatcher hot path for dead-letter fan-out. Filters: source
     /// (or any-source), originating trigger_id (or any), originating
     /// script_id (or any). Each filter is "match OR is_null".
@@ -555,6 +610,71 @@ impl TriggerRepo for PostgresTriggerRepo {
         })
     }
 
+    async fn create_files_trigger(
+        &self,
+        app_id: AppId,
+        req: CreateFilesTrigger,
+    ) -> Result<Trigger, TriggerRepoError> {
+        if req.collection_glob.is_empty() {
+            return Err(TriggerRepoError::Invalid(
+                "collection_glob must not be empty".into(),
+            ));
+        }
+        let mut tx = self.pool.begin().await?;
+        let parent: TriggerRow = sqlx::query_as(
+            "INSERT INTO triggers ( \
+                app_id, script_id, kind, enabled, dispatch_mode, \
+                retry_max_attempts, retry_backoff, retry_base_ms, \
+                registered_by_principal \
+             ) VALUES ($1, $2, 'files', TRUE, $3, $4, $5, $6, $7) \
+             RETURNING id, app_id, script_id, kind, enabled, dispatch_mode, \
+                       retry_max_attempts, retry_backoff, retry_base_ms, \
+                       registered_by_principal, created_at, updated_at",
+        )
+        .bind(app_id.into_inner())
+        .bind(req.script_id.into_inner())
+        .bind(req.dispatch_mode.as_str())
+        .bind(i32::try_from(req.retry_max_attempts).unwrap_or(3))
+        .bind(req.retry_backoff.as_str())
+        .bind(i32::try_from(req.retry_base_ms).unwrap_or(1000))
+        .bind(req.registered_by_principal.into_inner())
+        .fetch_one(&mut *tx)
+        .await?;
+
+        let ops_str: Vec<String> = req.ops.iter().map(|o| o.as_str().to_string()).collect();
+        sqlx::query(
+            "INSERT INTO files_trigger_details (trigger_id, collection_glob, ops) \
+             VALUES ($1, $2, $3)",
+        )
+        .bind(parent.id)
+        .bind(&req.collection_glob)
+        .bind(&ops_str)
+        .execute(&mut *tx)
+        .await?;
+
+        tx.commit().await?;
+
+        Ok(Trigger {
+            id: parent.id.into(),
+            app_id: parent.app_id.into(),
+            script_id: parent.script_id.into(),
+            kind: TriggerKind::Files,
+            enabled: parent.enabled,
+            dispatch_mode: dispatch_from_str(&parent.dispatch_mode),
+            retry_max_attempts: u32::try_from(parent.retry_max_attempts).unwrap_or(3),
+            retry_backoff: BackoffShape::from_wire(&parent.retry_backoff)
+                .unwrap_or(BackoffShape::Exponential),
+            retry_base_ms: u32::try_from(parent.retry_base_ms).unwrap_or(1000),
+            registered_by_principal: parent.registered_by_principal.into(),
+            created_at: parent.created_at,
+            updated_at: parent.updated_at,
+            details: TriggerDetails::Files {
+                collection_glob: req.collection_glob,
+                ops: req.ops,
+            },
+        })
+    }
+
     async fn list_for_app(&self, app_id: AppId) -> Result<Vec<Trigger>, TriggerRepoError> {
         let parents: Vec<TriggerRow> = sqlx::query_as(
             "SELECT id, app_id, script_id, kind, enabled, dispatch_mode, \
@@ -693,6 +813,51 @@ impl TriggerRepo for PostgresTriggerRepo {
         Ok(out)
     }
 
+    async fn list_matching_files(
+        &self,
+        app_id: AppId,
+        collection: &str,
+        op: FilesEventOp,
+    ) -> Result<Vec<FilesTriggerMatch>, TriggerRepoError> {
+        // Mirrors list_matching_kv: pull every enabled files trigger,
+        // filter glob + ops in Rust (empty ops array means "any op").
+        let rows: Vec<KvMatchRow> = sqlx::query_as(
+            "SELECT t.id, t.script_id, t.dispatch_mode, \
+                    t.retry_max_attempts, t.retry_backoff, t.retry_base_ms, \
+                    t.registered_by_principal, \
+                    d.collection_glob, d.ops \
+             FROM triggers t \
+             JOIN files_trigger_details d ON d.trigger_id = t.id \
+             WHERE t.app_id = $1 AND t.kind = 'files' AND t.enabled = TRUE",
+        )
+        .bind(app_id.into_inner())
+        .fetch_all(&self.pool)
+        .await?;
+
+        let op_str = op.as_str();
+        let mut out = Vec::new();
+        for r in rows {
+            if !collection_matches(&r.collection_glob, collection) {
+                continue;
+            }
+            let any_op = r.ops.is_empty();
+            if !any_op && !r.ops.iter().any(|o| o == op_str) {
+                continue;
+            }
+            out.push(FilesTriggerMatch {
+                trigger_id: r.id.into(),
+                script_id: r.script_id.into(),
+                dispatch_mode: dispatch_from_str(&r.dispatch_mode),
+                retry_max_attempts: u32::try_from(r.retry_max_attempts).unwrap_or(3),
+                retry_backoff: BackoffShape::from_wire(&r.retry_backoff)
+                    .unwrap_or(BackoffShape::Exponential),
+                retry_base_ms: u32::try_from(r.retry_base_ms).unwrap_or(1000),
+                registered_by_principal: r.registered_by_principal.into(),
+            });
+        }
+        Ok(out)
+    }
+
     async fn list_matching_dead_letter(
         &self,
         app_id: AppId,
@@ -729,6 +894,7 @@ impl TriggerRepo for PostgresTriggerRepo {
     }
 }
 
+#[allow(clippy::too_many_lines)]
 async fn hydrate_one(pool: &PgPool, parent: TriggerRow) -> Result<Trigger, TriggerRepoError> {
     let kind = TriggerKind::from_wire(&parent.kind).ok_or_else(|| {
         TriggerRepoError::Invalid(format!("unknown trigger kind {}", parent.kind))
@@ -797,6 +963,23 @@ async fn hydrate_one(pool: &PgPool, parent: TriggerRow) -> Result<Trigger, Trigg
                 last_fired_at: row.last_fired_at,
             }
         }
+        TriggerKind::Files => {
+            let row: KvDetailRow = sqlx::query_as(
+                "SELECT collection_glob, ops FROM files_trigger_details WHERE trigger_id = $1",
+            )
+            .bind(parent.id)
+            .fetch_one(pool)
+            .await?;
+            let ops = row
+                .ops
+                .iter()
+                .filter_map(|s| FilesEventOp::from_wire(s))
+                .collect();
+            TriggerDetails::Files {
+                collection_glob: row.collection_glob,
+                ops,
+            }
+        }
     };
 
     Ok(Trigger {

crates/manager-core/src/triggers_api.rs

@@ -16,7 +16,9 @@ use axum::http::StatusCode;
 use axum::response::{IntoResponse, Json, Response};
 use axum::routing::{delete, get, post};
 use axum::{Extension, Router};
-use picloud_shared::{AppId, DocsEventOp, KvEventOp, Principal, ScriptId, ScriptKind, TriggerId};
+use picloud_shared::{
+    AppId, DocsEventOp, FilesEventOp, KvEventOp, Principal, ScriptId, ScriptKind, TriggerId,
+};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 
@@ -25,8 +27,8 @@ use crate::authz::{require, AuthzDenied, AuthzError, AuthzRepo, Capability};
 use crate::repo::{ScriptRepository, ScriptRepositoryError};
 use crate::trigger_config::{BackoffShape, TriggerConfig};
 use crate::trigger_repo::{
-    CreateCronTrigger, CreateDeadLetterTrigger, CreateDocsTrigger, CreateKvTrigger, Trigger,
-    TriggerDispatchMode, TriggerRepo, TriggerRepoError,
+    CreateCronTrigger, CreateDeadLetterTrigger, CreateDocsTrigger, CreateFilesTrigger,
+    CreateKvTrigger, Trigger, TriggerDispatchMode, TriggerRepo, TriggerRepoError,
 };
 
 #[derive(Clone)]
@@ -54,6 +56,7 @@ pub fn triggers_router(state: TriggersState) -> Router {
         .route("/apps/{app_id}/triggers/kv", post(create_kv_trigger))
         .route("/apps/{app_id}/triggers/docs", post(create_docs_trigger))
         .route("/apps/{app_id}/triggers/cron", post(create_cron_trigger))
+        .route("/apps/{app_id}/triggers/files", post(create_files_trigger))
         .route(
             "/apps/{app_id}/triggers/dead_letter",
             post(create_dl_trigger),
@@ -139,6 +142,24 @@ fn default_timezone() -> String {
     "UTC".to_string()
 }
 
+/// v1.1.5 files trigger. Mirrors `CreateKvTriggerRequest`; `ops` uses
+/// `FilesEventOp` (`create` / `update` / `delete`).
+#[derive(Debug, Deserialize)]
+pub struct CreateFilesTriggerRequest {
+    pub script_id: ScriptId,
+    pub collection_glob: String,
+    #[serde(default)]
+    pub ops: Vec<FilesEventOp>,
+    #[serde(default = "default_dispatch")]
+    pub dispatch_mode: TriggerDispatchMode,
+    #[serde(default)]
+    pub retry_max_attempts: Option<u32>,
+    #[serde(default)]
+    pub retry_backoff: Option<BackoffShape>,
+    #[serde(default)]
+    pub retry_base_ms: Option<u32>,
+}
+
 #[derive(Debug, Deserialize)]
 pub struct CreateDeadLetterTriggerRequest {
     pub script_id: ScriptId,
@@ -328,6 +349,43 @@ async fn create_cron_trigger(
     Ok((StatusCode::CREATED, Json(created)))
 }
 
+async fn create_files_trigger(
+    State(s): State<TriggersState>,
+    Extension(principal): Extension<Principal>,
+    Path(app_id): Path<AppId>,
+    Json(input): Json<CreateFilesTriggerRequest>,
+) -> Result<(StatusCode, Json<Trigger>), TriggersApiError> {
+    ensure_app_exists(&*s.apps, app_id).await?;
+    require(
+        s.authz.as_ref(),
+        &principal,
+        Capability::AppManageTriggers(app_id),
+    )
+    .await?;
+
+    if input.collection_glob.trim().is_empty() {
+        return Err(TriggersApiError::Invalid(
+            "collection_glob must not be empty".into(),
+        ));
+    }
+    validate_trigger_target(&*s.scripts, app_id, input.script_id).await?;
+
+    let req = CreateFilesTrigger {
+        script_id: input.script_id,
+        collection_glob: input.collection_glob,
+        ops: input.ops,
+        dispatch_mode: input.dispatch_mode,
+        retry_max_attempts: input
+            .retry_max_attempts
+            .unwrap_or(s.config.retry_max_attempts),
+        retry_backoff: input.retry_backoff.unwrap_or(s.config.retry_backoff),
+        retry_base_ms: input.retry_base_ms.unwrap_or(s.config.retry_base_ms),
+        registered_by_principal: principal.user_id,
+    };
+    let created = s.triggers.create_files_trigger(app_id, req).await?;
+    Ok((StatusCode::CREATED, Json(created)))
+}
+
 async fn create_dl_trigger(
     State(s): State<TriggersState>,
     Extension(principal): Extension<Principal>,
@@ -484,13 +542,14 @@ mod tests {
     use super::*;
     use crate::app_repo::{AppLookup, AppRepository};
     use crate::trigger_repo::{
-        CreateCronTrigger, DeadLetterTriggerMatch, DocsTriggerMatch, KvTriggerMatch, Trigger,
-        TriggerDetails, TriggerRepo, TriggerRepoError,
+        CreateCronTrigger, CreateFilesTrigger, DeadLetterTriggerMatch, DocsTriggerMatch,
+        FilesTriggerMatch, KvTriggerMatch, Trigger, TriggerDetails, TriggerRepo, TriggerRepoError,
     };
     use async_trait::async_trait;
     use chrono::Utc;
     use picloud_shared::{
-        AdminUserId, App, AppRole, DocsEventOp, KvEventOp, ScriptId, TriggerId, UserId,
+        AdminUserId, App, AppRole, DocsEventOp, FilesEventOp, KvEventOp, ScriptId, TriggerId,
+        UserId,
     };
     use std::collections::HashMap;
     use tokio::sync::Mutex;
@@ -616,6 +675,34 @@ mod tests {
             self.inner.lock().await.insert(id, trigger.clone());
             Ok(trigger)
         }
+        async fn create_files_trigger(
+            &self,
+            app_id: AppId,
+            req: CreateFilesTrigger,
+        ) -> Result<Trigger, TriggerRepoError> {
+            let now = Utc::now();
+            let id = TriggerId::new();
+            let trigger = Trigger {
+                id,
+                app_id,
+                script_id: req.script_id,
+                kind: crate::trigger_repo::TriggerKind::Files,
+                enabled: true,
+                dispatch_mode: req.dispatch_mode,
+                retry_max_attempts: req.retry_max_attempts,
+                retry_backoff: req.retry_backoff,
+                retry_base_ms: req.retry_base_ms,
+                registered_by_principal: req.registered_by_principal,
+                created_at: now,
+                updated_at: now,
+                details: TriggerDetails::Files {
+                    collection_glob: req.collection_glob,
+                    ops: req.ops,
+                },
+            };
+            self.inner.lock().await.insert(id, trigger.clone());
+            Ok(trigger)
+        }
         async fn list_for_app(&self, app_id: AppId) -> Result<Vec<Trigger>, TriggerRepoError> {
             Ok(self
                 .inner
@@ -648,6 +735,14 @@ mod tests {
         ) -> Result<Vec<DocsTriggerMatch>, TriggerRepoError> {
             Ok(vec![])
         }
+        async fn list_matching_files(
+            &self,
+            _app_id: AppId,
+            _collection: &str,
+            _op: FilesEventOp,
+        ) -> Result<Vec<FilesTriggerMatch>, TriggerRepoError> {
+            Ok(vec![])
+        }
         async fn list_matching_dead_letter(
             &self,
             _app_id: AppId,