fix(admin): keyboard-reachable audit payload toggle; drop dead step ternary

Review follow-ups: the audit row's expand was mouse-only (onclick on a bare
<tr>). Move the toggle to a real <button> in the actions cell with
aria-expanded + aria-label so keyboard/AT users can open a row's payload; the
row onclick stays as a mouse convenience (stopPropagation avoids a double
toggle). Also simplify a no-op `step={'%' ? '1' : '1'}` to step="1" on the
threshold inputs.

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

backend/Cargo.lock

@@ -1517,7 +1517,7 @@ checksum = "c41e0c4fef86961ac6d6f8a82609f55f31b05e4fce149ac5710e439df7619ba4"
 
 [[package]]
 name = "mangalord"
-version = "0.85.1"
+version = "0.87.0"
 dependencies = [
  "anyhow",
  "argon2",

backend/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mangalord"
-version = "0.85.1"
+version = "0.87.0"
 edition = "2021"
 default-run = "mangalord"
 

backend/migrations/0030_page_analysis_analyzed_at_index.sql

@@ -0,0 +1,8 @@
+-- Index for the Analysis trend-chart series, which buckets terminal page
+-- analyses by `analyzed_at` (date_trunc) over a recent window. Without it the
+-- bucketed GROUP BY falls back to a full scan of page_analysis (one row per
+-- page in the library). Partial to the rows the series query actually reads
+-- (terminal status with a timestamp), keeping the index small.
+CREATE INDEX IF NOT EXISTS page_analysis_analyzed_at_idx
+    ON page_analysis (analyzed_at)
+ WHERE status <> 'pending' AND analyzed_at IS NOT NULL;

backend/src/api/admin/analysis.rs

@@ -44,6 +44,7 @@ pub fn routes() -> Router<AppState> {
         .route("/admin/analysis/pages/:id", get(page_detail))
         .route("/admin/analysis/history", get(list_history))
         .route("/admin/analysis/metrics", get(metrics))
+        .route("/admin/analysis/metrics/series", get(metrics_series))
         .route("/admin/analysis/status/stream", get(stream_status))
 }
 
@@ -215,6 +216,46 @@ pub(super) fn window_since(days: i64) -> Option<chrono::DateTime<chrono::Utc>> {
     }
 }
 
+// --- shared trend-series plumbing (crawler + analysis charts) ---------------
+
+/// Query params for the bucketed trend-series endpoints. `bucket` is
+/// optional; when absent it's derived from `days`.
+#[derive(Debug, Deserialize, Default)]
+pub struct SeriesParams {
+    #[serde(default)]
+    pub days: i64,
+    #[serde(default)]
+    pub bucket: Option<String>,
+}
+
+/// Envelope for a trend series.
+#[derive(Debug, Serialize)]
+pub struct SeriesResponse<T> {
+    pub buckets: Vec<T>,
+}
+
+/// Resolve the `date_trunc` granularity: an explicit `bucket` (validated to
+/// `hour`|`day`, else 400) wins; otherwise short windows bucket by hour and
+/// longer ones by day so the point count stays chart-friendly.
+pub(super) fn resolve_bucket(
+    days: i64,
+    explicit: Option<&str>,
+) -> Result<crate::repo::crawl_metrics::Bucket, AppError> {
+    use crate::repo::crawl_metrics::Bucket;
+    match explicit {
+        Some("hour") => Ok(Bucket::Hour),
+        Some("day") => Ok(Bucket::Day),
+        Some(other) => Err(AppError::InvalidInput(format!(
+            "invalid bucket '{other}' (expected 'hour' or 'day')"
+        ))),
+        None => Ok(if days > 0 && days <= 2 {
+            Bucket::Hour
+        } else {
+            Bucket::Day
+        }),
+    }
+}
+
 async fn metrics(
     State(state): State<AppState>,
     _admin: RequireAdmin,
@@ -225,6 +266,17 @@ async fn metrics(
     Ok(Json(m))
 }
 
+async fn metrics_series(
+    State(state): State<AppState>,
+    _admin: RequireAdmin,
+    Query(params): Query<SeriesParams>,
+) -> AppResult<Json<SeriesResponse<crate::domain::crawl_metrics::MetricsBucket>>> {
+    let bucket = resolve_bucket(params.days, params.bucket.as_deref())?;
+    let buckets =
+        repo::page_analysis::analysis_series(&state.db, bucket, window_since(params.days)).await?;
+    Ok(Json(SeriesResponse { buckets }))
+}
+
 #[derive(Debug, Deserialize)]
 pub struct ReenqueueBody {
     /// Skip pages that already have a `done` analysis row. Defaults to

backend/src/api/admin/audit.rs

@@ -0,0 +1,70 @@
+//! GET /admin/audit — paginated, filterable admin-action audit log.
+//!
+//! A pure DB read over the `admin_audit` table joined to the actor's
+//! username. Drives the "Audit" admin tab: who did what, when. Every
+//! mutating admin action writes a row here; this is the only reader.
+
+use axum::extract::{Query, State};
+use axum::routing::get;
+use axum::{Json, Router};
+use serde::Deserialize;
+use uuid::Uuid;
+
+use crate::app::AppState;
+use crate::auth::extractor::RequireAdmin;
+use crate::error::AppResult;
+use crate::repo;
+use crate::repo::admin_audit::{AuditEntryRow, AuditFilter};
+
+// Reuse the analysis window helper so `days` clamps identically everywhere.
+use crate::api::admin::analysis::window_since;
+
+pub fn routes() -> Router<AppState> {
+    Router::new().route("/admin/audit", get(list_audit))
+}
+
+fn default_limit() -> i64 {
+    50
+}
+
+#[derive(Debug, Deserialize, Default)]
+struct AuditParams {
+    #[serde(default)]
+    action: Option<String>,
+    #[serde(default)]
+    target_kind: Option<String>,
+    #[serde(default)]
+    actor_user_id: Option<Uuid>,
+    #[serde(default)]
+    days: i64,
+    #[serde(default = "default_limit")]
+    limit: i64,
+    #[serde(default)]
+    offset: i64,
+}
+
+async fn list_audit(
+    State(state): State<AppState>,
+    _admin: RequireAdmin,
+    Query(params): Query<AuditParams>,
+) -> AppResult<Json<crate::api::pagination::PagedResponse<AuditEntryRow>>> {
+    let limit = params.limit.clamp(1, 200);
+    let offset = params.offset.max(0);
+    let action = params.action.filter(|s| !s.trim().is_empty());
+    let target_kind = params.target_kind.filter(|s| !s.trim().is_empty());
+    let (items, total) = repo::admin_audit::list(
+        &state.db,
+        AuditFilter {
+            action: action.as_deref(),
+            target_kind: target_kind.as_deref(),
+            actor_user_id: params.actor_user_id,
+            since: window_since(params.days),
+        },
+        limit,
+        offset,
+    )
+    .await?;
+    Ok(Json(crate::api::pagination::PagedResponse::with_total(
+        items, limit, offset, total,
+    )))
+}

backend/src/api/admin/crawler/control.rs

@@ -24,6 +24,7 @@ use super::require_crawler;
 pub(super) fn routes() -> Router<AppState> {
     Router::new()
         .route("/admin/crawler/run", post(run_now))
+        .route("/admin/crawler/reconcile", post(reconcile_now))
         .route("/admin/crawler/browser/restart", post(restart_browser))
         .route("/admin/crawler/session", post(update_session))
         .route(
@@ -71,6 +72,45 @@ async fn run_now(
     Ok(Json(RunResponse { started: true }))
 }
 
+async fn reconcile_now(
+    State(state): State<AppState>,
+    admin: RequireAdmin,
+) -> AppResult<Json<RunResponse>> {
+    let c = require_crawler(&state)?;
+    let rp = c.reconcile_pass.as_ref().ok_or_else(|| {
+        AppError::ServiceUnavailable("no source configured (CRAWLER_START_URL unset)".into())
+    })?;
+    // Share `manual_pass_lock` with the metadata pass: reconcile's list walk
+    // and a metadata pass both contend for the single browser lease, so they
+    // must not run concurrently. A click while either is in flight gets 409.
+    let pass_guard = c
+        .manual_pass_lock
+        .clone()
+        .try_lock_owned()
+        .map_err(|_| AppError::Conflict("a metadata or reconcile pass is already running".into()))?;
+    let rp = std::sync::Arc::clone(rp);
+    // Fire-and-forget: the full list walk runs for minutes; progress streams
+    // over SSE (the Reconciling phase). The guard moves into the task so the
+    // lock releases only when the walk + enqueue finish.
+    tokio::spawn(async move {
+        let _pass_guard = pass_guard;
+        match rp.run().await {
+            Ok(stats) => tracing::info!(?stats, "manual reconcile pass complete"),
+            Err(e) => tracing::warn!(error = ?e, "manual reconcile pass failed"),
+        }
+    });
+    repo::admin_audit::insert(
+        &state.db,
+        admin.0.id,
+        "crawler_reconcile",
+        "crawler",
+        None,
+        json!({}),
+    )
+    .await?;
+    Ok(Json(RunResponse { started: true }))
+}
+
 #[derive(Debug, Serialize)]
 struct RestartResponse {
     ok: bool,

backend/src/api/admin/crawler/metrics.rs

@@ -11,20 +11,31 @@ use serde::{Deserialize, Serialize};
 
 use crate::app::AppState;
 use crate::auth::extractor::RequireAdmin;
-use crate::domain::crawl_metrics::{OpRow, OpSummary};
+use crate::domain::crawl_metrics::{MetricsBucket, OpRow, OpSummary};
 use crate::error::AppResult;
 use crate::repo;
 use crate::repo::crawl_metrics::OpFilter;
 
 use super::default_limit;
-// Reuse the analysis handler's window helper so both endpoints clamp `days`
-// identically.
-use crate::api::admin::analysis::window_since;
+// Reuse the analysis handler's window + bucket helpers so all the metrics
+// endpoints clamp `days` and resolve `bucket` identically.
+use crate::api::admin::analysis::{resolve_bucket, window_since, SeriesParams, SeriesResponse};
 
 pub(super) fn routes() -> Router<AppState> {
     Router::new()
         .route("/admin/crawler/metrics", get(summary))
         .route("/admin/crawler/metrics/ops", get(list_ops))
+        .route("/admin/crawler/metrics/series", get(series))
+}
+
+async fn series(
+    State(state): State<AppState>,
+    _admin: RequireAdmin,
+    Query(params): Query<SeriesParams>,
+) -> AppResult<Json<SeriesResponse<MetricsBucket>>> {
+    let bucket = resolve_bucket(params.days, params.bucket.as_deref())?;
+    let buckets = repo::crawl_metrics::series(&state.db, bucket, window_since(params.days)).await?;
+    Ok(Json(SeriesResponse { buckets }))
 }
 
 #[derive(Debug, Deserialize, Default)]

backend/src/api/admin/health.rs

@@ -0,0 +1,444 @@
+//! GET  /admin/health             — aggregated operational health checks
+//! PUT  /admin/health/thresholds  — edit the alerting thresholds
+//!
+//! A single read that rolls up signals already collected elsewhere (system
+//! sensors, queue depths, recent failure rates, cron freshness, the live
+//! crawler session/browser flags) into a flat list of checks with an
+//! overall status. Thresholds live in `app_settings['health_thresholds']`
+//! (JSONB, merged over compiled defaults) and are admin-editable + audited.
+
+use axum::extract::State;
+use axum::routing::{get, put};
+use axum::{Json, Router};
+use chrono::{Duration, Utc};
+use futures_util::TryFutureExt;
+use serde::{Deserialize, Serialize};
+
+use crate::app::AppState;
+use crate::auth::extractor::RequireAdmin;
+use crate::crawler::browser_manager::RestartPhase;
+use crate::error::{AppError, AppResult};
+use crate::repo;
+
+const KEY: &str = "health_thresholds";
+
+pub fn routes() -> Router<AppState> {
+    Router::new()
+        .route("/admin/health", get(health))
+        .route("/admin/health/thresholds", put(update_thresholds))
+}
+
+// ---------------------------------------------------------------------------
+// Thresholds (persisted, editable)
+// ---------------------------------------------------------------------------
+
+fn d_disk() -> f64 {
+    90.0
+}
+fn d_mem() -> f64 {
+    90.0
+}
+fn d_dead() -> i64 {
+    100
+}
+fn d_crawl_fail() -> f64 {
+    20.0
+}
+fn d_analysis_fail() -> f64 {
+    20.0
+}
+fn d_cron() -> i64 {
+    26
+}
+fn d_covers() -> i64 {
+    500
+}
+
+/// Alerting thresholds. Each field has a `serde(default)` so a stored row
+/// that predates a newly-added field still deserializes (the missing field
+/// takes its compiled default — forward-compatible).
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+pub struct HealthThresholds {
+    #[serde(default = "d_disk")]
+    pub disk_pct: f64,
+    #[serde(default = "d_mem")]
+    pub mem_pct: f64,
+    #[serde(default = "d_dead")]
+    pub dead_jobs_max: i64,
+    #[serde(default = "d_crawl_fail")]
+    pub crawl_fail_pct: f64,
+    #[serde(default = "d_analysis_fail")]
+    pub analysis_fail_pct: f64,
+    #[serde(default = "d_cron")]
+    pub cron_freshness_hours: i64,
+    #[serde(default = "d_covers")]
+    pub missing_covers_max: i64,
+}
+
+impl Default for HealthThresholds {
+    fn default() -> Self {
+        Self {
+            disk_pct: d_disk(),
+            mem_pct: d_mem(),
+            dead_jobs_max: d_dead(),
+            crawl_fail_pct: d_crawl_fail(),
+            analysis_fail_pct: d_analysis_fail(),
+            cron_freshness_hours: d_cron(),
+            missing_covers_max: d_covers(),
+        }
+    }
+}
+
+impl HealthThresholds {
+    /// Reject nonsensical values so a check can't be silently disabled by a
+    /// fat-fingered edit. Percentages 1..=100; counts/hours must be positive.
+    fn validate(&self) -> Result<(), String> {
+        let pct = |v: f64, name: &str| {
+            if (1.0..=100.0).contains(&v) {
+                Ok(())
+            } else {
+                Err(format!("{name} must be between 1 and 100"))
+            }
+        };
+        pct(self.disk_pct, "disk_pct")?;
+        pct(self.mem_pct, "mem_pct")?;
+        pct(self.crawl_fail_pct, "crawl_fail_pct")?;
+        pct(self.analysis_fail_pct, "analysis_fail_pct")?;
+        if self.dead_jobs_max < 0 {
+            return Err("dead_jobs_max must be >= 0".into());
+        }
+        if self.missing_covers_max < 0 {
+            return Err("missing_covers_max must be >= 0".into());
+        }
+        if self.cron_freshness_hours < 1 {
+            return Err("cron_freshness_hours must be >= 1".into());
+        }
+        Ok(())
+    }
+}
+
+async fn load_thresholds(state: &AppState) -> AppResult<HealthThresholds> {
+    Ok(match repo::app_settings::get(&state.db, KEY).await? {
+        // serde(default) on each field fills anything the stored object omits.
+        Some(v) => serde_json::from_value(v).unwrap_or_default(),
+        None => HealthThresholds::default(),
+    })
+}
+
+// ---------------------------------------------------------------------------
+// Checks
+// ---------------------------------------------------------------------------
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "snake_case")]
+pub enum CheckStatus {
+    Ok,
+    Warn,
+    Critical,
+}
+
+impl CheckStatus {
+    fn rank(self) -> u8 {
+        match self {
+            CheckStatus::Ok => 0,
+            CheckStatus::Warn => 1,
+            CheckStatus::Critical => 2,
+        }
+    }
+}
+
+/// `Ok` while `value` is strictly below `limit`, else `Warn`. Used for
+/// "near a ceiling" gauges (disk/memory/fail-rate percentages, cron-age
+/// hours) where hitting the threshold is itself the alert. Pure so the
+/// rule is unit-testable without the DB/sensors.
+pub(crate) fn over_limit(value: f64, limit: f64) -> CheckStatus {
+    if value < limit {
+        CheckStatus::Ok
+    } else {
+        CheckStatus::Warn
+    }
+}
+
+/// `Ok` until `value` strictly exceeds `limit`. Used for "max allowed"
+/// backlog counts so a limit of `0` warns on the first item — and `0` items
+/// against a `0` limit stays `Ok` (no false alarm at exactly the boundary).
+pub(crate) fn exceeds(value: i64, limit: i64) -> CheckStatus {
+    if value > limit {
+        CheckStatus::Warn
+    } else {
+        CheckStatus::Ok
+    }
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct HealthCheck {
+    pub id: &'static str,
+    pub label: &'static str,
+    pub status: CheckStatus,
+    pub value: String,
+    pub threshold: Option<String>,
+    pub hint: Option<String>,
+    /// Admin route that remediates this check, when one applies.
+    pub action_href: Option<&'static str>,
+}
+
+#[derive(Debug, Clone, Serialize)]
+pub struct HealthReport {
+    /// Worst status across all checks (drives the page/summary badge).
+    pub status: CheckStatus,
+    pub checks: Vec<HealthCheck>,
+    pub thresholds: HealthThresholds,
+}
+
+async fn health(
+    State(state): State<AppState>,
+    _admin: RequireAdmin,
+) -> AppResult<Json<HealthReport>> {
+    let thresholds = load_thresholds(&state).await?;
+    let since_24h = Utc::now() - Duration::hours(24);
+
+    // DB-derived signals run concurrently — all hit existing indexes.
+    let ((pending, running, dead), missing_covers, crawl, analysis, last_tick) = tokio::try_join!(
+        repo::crawler::job_state_counts(&state.db).map_err(AppError::from),
+        repo::crawler::count_missing_covers(&state.db).map_err(AppError::from),
+        repo::crawl_metrics::summary(&state.db, Some(since_24h)).map_err(AppError::from),
+        repo::page_analysis::analysis_metrics(&state.db, Some(since_24h)),
+        repo::crawler::last_metadata_tick_at(&state.db).map_err(AppError::from),
+    )?;
+    let _ = (pending, running); // queue depth shown elsewhere; not a check yet
+
+    let mut checks: Vec<HealthCheck> = Vec::new();
+
+    // --- system sensors ---
+    if let Some(d) = state.storage.local_root().and_then(super::system::disk_stats_for) {
+        checks.push(HealthCheck {
+            id: "disk",
+            label: "Disk usage",
+            status: over_limit(d.percent_used, thresholds.disk_pct),
+            value: format!("{:.0}%", d.percent_used),
+            threshold: Some(format!("{:.0}%", thresholds.disk_pct)),
+            hint: Some("free space on the storage volume".into()),
+            action_href: None,
+        });
+    }
+    let mem = super::system::memory_percent_used();
+    checks.push(HealthCheck {
+        id: "memory",
+        label: "Memory usage",
+        status: over_limit(mem, thresholds.mem_pct),
+        value: format!("{mem:.0}%"),
+        threshold: Some(format!("{:.0}%", thresholds.mem_pct)),
+        hint: None,
+        action_href: None,
+    });
+
+    // --- queue / backlog ---
+    checks.push(HealthCheck {
+        id: "dead_jobs",
+        label: "Dead jobs",
+        status: exceeds(dead, thresholds.dead_jobs_max),
+        value: dead.to_string(),
+        threshold: Some(thresholds.dead_jobs_max.to_string()),
+        hint: Some("jobs that exhausted their retries".into()),
+        action_href: Some("/admin/crawler"),
+    });
+    checks.push(HealthCheck {
+        id: "missing_covers",
+        label: "Missing covers",
+        status: exceeds(missing_covers, thresholds.missing_covers_max),
+        value: missing_covers.to_string(),
+        threshold: Some(thresholds.missing_covers_max.to_string()),
+        hint: Some("mangas still awaiting a cover download".into()),
+        action_href: Some("/admin/crawler"),
+    });
+
+    // --- failure rates (last 24h) ---
+    let crawl_total: i64 = crawl.iter().map(|s| s.n).sum();
+    let crawl_failed: i64 = crawl.iter().map(|s| s.failed).sum();
+    let crawl_pct = pct(crawl_failed, crawl_total);
+    checks.push(HealthCheck {
+        id: "crawl_fail_rate",
+        label: "Crawl failure rate (24h)",
+        status: if crawl_total == 0 {
+            CheckStatus::Ok
+        } else {
+            over_limit(crawl_pct, thresholds.crawl_fail_pct)
+        },
+        value: format!("{crawl_pct:.0}% ({crawl_failed}/{crawl_total})"),
+        threshold: Some(format!("{:.0}%", thresholds.crawl_fail_pct)),
+        hint: None,
+        action_href: Some("/admin/crawler"),
+    });
+    let an_pct = pct(analysis.failed, analysis.n);
+    checks.push(HealthCheck {
+        id: "analysis_fail_rate",
+        label: "Analysis failure rate (24h)",
+        status: if analysis.n == 0 {
+            CheckStatus::Ok
+        } else {
+            over_limit(an_pct, thresholds.analysis_fail_pct)
+        },
+        value: format!("{an_pct:.0}% ({}/{})", analysis.failed, analysis.n),
+        threshold: Some(format!("{:.0}%", thresholds.analysis_fail_pct)),
+        hint: None,
+        action_href: Some("/admin/analysis"),
+    });
+
+    // --- crawler daemon liveness (only when the daemon is configured) ---
+    if let Some(c) = state.crawler().as_ref() {
+        // Cron freshness: stale tick = the daily pass hasn't run on time.
+        match last_tick {
+            Some(t) => {
+                let age_h = (Utc::now() - t).num_hours();
+                checks.push(HealthCheck {
+                    id: "cron_freshness",
+                    label: "Metadata cron freshness",
+                    status: over_limit(age_h as f64, thresholds.cron_freshness_hours as f64),
+                    value: format!("{age_h}h ago"),
+                    threshold: Some(format!("{}h", thresholds.cron_freshness_hours)),
+                    hint: Some("time since the last metadata pass tick".into()),
+                    action_href: Some("/admin/crawler"),
+                });
+            }
+            None => checks.push(HealthCheck {
+                id: "cron_freshness",
+                label: "Metadata cron freshness",
+                status: CheckStatus::Ok,
+                value: "no tick yet".into(),
+                threshold: None,
+                hint: Some("the daemon has not completed a pass yet".into()),
+                action_href: Some("/admin/crawler"),
+            }),
+        }
+
+        let expired = c.session.is_expired();
+        checks.push(HealthCheck {
+            id: "crawler_session",
+            label: "Crawler session",
+            status: if expired { CheckStatus::Critical } else { CheckStatus::Ok },
+            value: if expired { "expired".into() } else { "ok".into() },
+            threshold: None,
+            hint: expired.then(|| "chapter workers are idle until the session is refreshed".into()),
+            action_href: Some("/admin/crawler"),
+        });
+
+        let healthy = matches!(c.browser_manager.phase(), RestartPhase::Healthy);
+        let phase = match c.browser_manager.phase() {
+            RestartPhase::Healthy => "healthy",
+            RestartPhase::Draining => "draining",
+            RestartPhase::Restarting => "restarting",
+        };
+        checks.push(HealthCheck {
+            id: "crawler_browser",
+            label: "Crawler browser",
+            status: if healthy { CheckStatus::Ok } else { CheckStatus::Warn },
+            value: phase.to_string(),
+            threshold: None,
+            hint: (!healthy).then(|| "Chromium is restarting or unavailable".into()),
+            action_href: Some("/admin/crawler"),
+        });
+    }
+
+    let status = checks
+        .iter()
+        .map(|c| c.status)
+        .max_by_key(|s| s.rank())
+        .unwrap_or(CheckStatus::Ok);
+
+    Ok(Json(HealthReport {
+        status,
+        checks,
+        thresholds,
+    }))
+}
+
+/// Percentage `numerator/denominator`, guarding divide-by-zero.
+fn pct(numerator: i64, denominator: i64) -> f64 {
+    if denominator <= 0 {
+        0.0
+    } else {
+        (numerator as f64) * 100.0 / (denominator as f64)
+    }
+}
+
+async fn update_thresholds(
+    State(state): State<AppState>,
+    admin: RequireAdmin,
+    Json(body): Json<HealthThresholds>,
+) -> AppResult<Json<HealthReport>> {
+    body.validate().map_err(AppError::InvalidInput)?;
+    let value = serde_json::to_value(body).map_err(|e| AppError::Other(e.into()))?;
+    let mut tx = state.db.begin().await?;
+    repo::app_settings::upsert(&mut *tx, KEY, &value).await?;
+    repo::admin_audit::insert(
+        &mut *tx,
+        admin.0.id,
+        "update_health_thresholds",
+        "settings",
+        None,
+        value,
+    )
+    .await?;
+    tx.commit().await?;
+    // Re-evaluate so the client immediately sees checks recomputed against
+    // the new thresholds.
+    health(State(state), admin).await
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn over_limit_is_ok_below_warn_at_or_above() {
+        assert_eq!(over_limit(10.0, 20.0), CheckStatus::Ok);
+        assert_eq!(over_limit(19.999, 20.0), CheckStatus::Ok);
+        assert_eq!(over_limit(20.0, 20.0), CheckStatus::Warn);
+        assert_eq!(over_limit(99.0, 20.0), CheckStatus::Warn);
+    }
+
+    #[test]
+    fn exceeds_is_strict_and_safe_at_zero() {
+        assert_eq!(exceeds(0, 0), CheckStatus::Ok); // 0 backlog, 0 limit → no false alarm
+        assert_eq!(exceeds(1, 0), CheckStatus::Warn);
+        assert_eq!(exceeds(100, 100), CheckStatus::Ok);
+        assert_eq!(exceeds(101, 100), CheckStatus::Warn);
+    }
+
+    #[test]
+    fn pct_guards_zero_denominator() {
+        assert_eq!(pct(0, 0), 0.0);
+        assert_eq!(pct(5, 0), 0.0);
+        assert_eq!(pct(1, 4), 25.0);
+    }
+
+    #[test]
+    fn worst_status_ranking() {
+        assert!(CheckStatus::Critical.rank() > CheckStatus::Warn.rank());
+        assert!(CheckStatus::Warn.rank() > CheckStatus::Ok.rank());
+    }
+
+    #[test]
+    fn thresholds_validate_rejects_out_of_range() {
+        let mut t = HealthThresholds::default();
+        assert!(t.validate().is_ok());
+        t.disk_pct = 0.0;
+        assert!(t.validate().is_err());
+        t = HealthThresholds::default();
+        t.dead_jobs_max = -1;
+        assert!(t.validate().is_err());
+        t = HealthThresholds::default();
+        t.cron_freshness_hours = 0;
+        assert!(t.validate().is_err());
+    }
+
+    #[test]
+    fn thresholds_merge_defaults_for_missing_fields() {
+        // A stored object that predates `missing_covers_max` still decodes.
+        let partial = serde_json::json!({ "disk_pct": 80.0 });
+        let t: HealthThresholds = serde_json::from_value(partial).unwrap();
+        assert_eq!(t.disk_pct, 80.0);
+        assert_eq!(t.missing_covers_max, d_covers());
+        assert_eq!(t.cron_freshness_hours, d_cron());
+    }
+}

backend/src/api/admin/mod.rs

@@ -5,7 +5,9 @@
 //! `crate::auth::extractor::RequireAdmin`).
 
 pub mod analysis;
+pub mod audit;
 pub mod crawler;
+pub mod health;
 pub mod mangas;
 pub mod overview;
 pub mod resync;
@@ -26,6 +28,8 @@ pub fn routes() -> Router<AppState> {
         .merge(storage::routes())
         .merge(system::routes())
         .merge(overview::routes())
+        .merge(audit::routes())
+        .merge(health::routes())
         .merge(crawler::routes())
         .merge(analysis::routes())
         .merge(settings::routes())

backend/src/api/admin/system.rs

@@ -169,6 +169,21 @@ fn temperatures() -> Vec<TempStat> {
         .collect()
 }
 
+/// Lightweight memory-utilization percentage for the health check. Unlike
+/// [`memory_and_cpu`] this skips CPU sampling and its 250ms settle delay —
+/// health is polled more often and only needs the memory figure.
+pub(crate) fn memory_percent_used() -> f64 {
+    let mut sys =
+        System::new_with_specifics(RefreshKind::new().with_memory(MemoryRefreshKind::everything()));
+    sys.refresh_memory();
+    let total = sys.total_memory();
+    if total == 0 {
+        0.0
+    } else {
+        (sys.used_memory() as f64) * 100.0 / (total as f64)
+    }
+}
+
 pub(crate) fn disk_stats_for(root: &Path) -> Option<DiskStats> {
     let s = nix::sys::statvfs::statvfs(root).ok()?;
     // statvfs reports `f_frsize * f_blocks` for total bytes. `f_bavail`

backend/src/app.rs

@@ -170,6 +170,9 @@ pub struct CrawlerControl {
     /// Used by the "run metadata pass now" endpoint; `None` when no
     /// `CRAWLER_START_URL` is configured (cron disabled).
     pub metadata_pass: Option<Arc<dyn MetadataPass>>,
+    /// Used by the "reconcile missing" endpoint; `None` when no
+    /// `CRAWLER_START_URL` is configured.
+    pub reconcile_pass: Option<Arc<dyn crate::crawler::daemon::ReconcilePass>>,
     /// Drain budget for a manually-triggered coordinated browser restart.
     pub drain_deadline: std::time::Duration,
     /// Held for the duration of a `/admin/crawler/run` pass so a second
@@ -599,6 +602,19 @@ async fn spawn_crawler_daemon(
         m
     });
 
+    let reconcile_pass: Option<Arc<dyn crate::crawler::daemon::ReconcilePass>> =
+        cfg.start_url.as_ref().map(|url| {
+            let m: Arc<dyn crate::crawler::daemon::ReconcilePass> = Arc::new(RealReconcilePass {
+                browser_manager: Arc::clone(&browser_manager),
+                db: db.clone(),
+                rate: Arc::clone(&rate),
+                start_url: url.clone(),
+                status: status.clone(),
+                tor: tor.as_ref().map(Arc::clone),
+            });
+            m
+        });
+
     let dispatcher: Arc<dyn ChapterDispatcher> = Arc::new(RealChapterDispatcher {
         browser_manager: Arc::clone(&browser_manager),
         db: db.clone(),
@@ -679,6 +695,7 @@ async fn spawn_crawler_daemon(
         session: session_controller,
         status,
         metadata_pass,
+        reconcile_pass,
         drain_deadline: cfg.job_timeout,
         manual_pass_lock: Arc::new(tokio::sync::Mutex::new(())),
     });
@@ -770,6 +787,36 @@ impl MetadataPass for RealMetadataPass {
     }
 }
 
+struct RealReconcilePass {
+    browser_manager: Arc<BrowserManager>,
+    db: PgPool,
+    rate: Arc<HostRateLimiters>,
+    start_url: String,
+    status: crate::crawler::status::StatusHandle,
+    tor: Option<Arc<crate::crawler::tor::TorController>>,
+}
+
+#[async_trait]
+impl crate::crawler::daemon::ReconcilePass for RealReconcilePass {
+    async fn run(&self) -> anyhow::Result<crate::crawler::reconcile::ReconcileStats> {
+        let result = crate::crawler::reconcile::reconcile_missing(
+            &self.browser_manager,
+            &self.db,
+            &self.rate,
+            &self.start_url,
+            Some(&self.status),
+            self.tor.as_deref(),
+        )
+        .await;
+        if let Err(e) = &result {
+            if crate::crawler::nav::anyhow_looks_browser_dead(e) {
+                self.browser_manager.invalidate().await;
+            }
+        }
+        result
+    }
+}
+
 struct RealChapterDispatcher {
     browser_manager: Arc<BrowserManager>,
     db: PgPool,
@@ -873,9 +920,80 @@ impl ChapterDispatcher for RealChapterDispatcher {
                     }
                 }
             }
-            // Other payload kinds aren't dispatched by this daemon yet —
-            // SyncManga / SyncChapterList are handled inline by the cron's
-            // metadata pass.
+            // Reconcile-enqueued manga-detail sync: fetch the detail page,
+            // upsert metadata, sync chapters — the identical per-ref work the
+            // cron metadata pass runs inline, via the shared
+            // `pipeline::process_manga_ref`.
+            JobPayload::SyncManga {
+                source_id: _,
+                source_manga_key,
+                url,
+                title,
+            } => {
+                let source = crate::crawler::source::target::TargetSource::new(url.clone());
+                let r = crate::crawler::source::SourceMangaRef {
+                    source_manga_key,
+                    title,
+                    url,
+                };
+                // Scope the lease so it (and the borrowing FetchContext) drop
+                // before any browser-restart handling in the match below.
+                let result = {
+                    let lease = self.browser_manager.acquire().await?;
+                    let ctx = crate::crawler::source::FetchContext {
+                        browser: &lease,
+                        rate: &self.rate,
+                        tor: self.tor.as_deref(),
+                    };
+                    pipeline::process_manga_ref(
+                        &ctx,
+                        &source,
+                        &self.db,
+                        self.storage.as_ref(),
+                        &self.http,
+                        &self.rate,
+                        &r,
+                        false, // chapters ON — we want chapter rows synced
+                        &self.download_allowlist,
+                        self.max_image_bytes,
+                        Some(&self.status),
+                    )
+                    .await
+                };
+                match result {
+                    Ok(p) => {
+                        self.transient_failures.store(0, Ordering::Release);
+                        tracing::info!(
+                            manga_id = %p.manga_id,
+                            key = %r.source_manga_key,
+                            "SyncManga: manga synced"
+                        );
+                        Ok(SyncOutcome::Fetched { pages: 0 })
+                    }
+                    Err(pipeline::RefError::Fetch(e)) | Err(pipeline::RefError::Skip(e)) => {
+                        let streak = self.transient_failures.fetch_add(1, Ordering::AcqRel) + 1;
+                        if crate::crawler::nav::anyhow_looks_browser_dead(&e) {
+                            self.browser_manager.invalidate().await;
+                            self.transient_failures.store(0, Ordering::Release);
+                        } else if self.restart_threshold > 0 && streak >= self.restart_threshold {
+                            tracing::warn!(
+                                streak,
+                                threshold = self.restart_threshold,
+                                "auto browser restart: consecutive transient sync_manga failures"
+                            );
+                            let _ = self
+                                .browser_manager
+                                .coordinated_restart(self.drain_deadline)
+                                .await;
+                            self.transient_failures.store(0, Ordering::Release);
+                        }
+                        Err(e)
+                    }
+                }
+            }
+            // Other payload kinds aren't dispatched by this daemon —
+            // SyncChapterList is handled inline by the cron's metadata pass;
+            // analyze_page is owned by the analysis daemon.
             _ => Ok(SyncOutcome::Skipped),
         }
     }

backend/src/crawler/daemon.rs

@@ -46,7 +46,7 @@ use tokio::task::JoinSet;
 use tokio_util::sync::CancellationToken;
 
 use crate::crawler::content::SyncOutcome;
-use crate::crawler::jobs::{self, JobPayload, Lease, KIND_SYNC_CHAPTER_CONTENT};
+use crate::crawler::jobs::{self, JobPayload, Lease, KIND_SYNC_CHAPTER_CONTENT, KIND_SYNC_MANGA};
 use crate::crawler::pipeline;
 use crate::crawler::status::{Phase, StatusHandle};
 
@@ -76,6 +76,15 @@ pub trait ChapterDispatcher: Send + Sync {
     async fn dispatch(&self, payload: JobPayload) -> anyhow::Result<SyncOutcome>;
 }
 
+/// A full list-only walk that enqueues mangas missing from the DB as
+/// `SyncManga` jobs. Triggered on demand from the admin `/reconcile`
+/// endpoint (not on the cron). Mirrors [`MetadataPass`] so the endpoint can
+/// hold a `dyn` and tests can stub it.
+#[async_trait]
+pub trait ReconcilePass: Send + Sync {
+    async fn run(&self) -> anyhow::Result<crate::crawler::reconcile::ReconcileStats>;
+}
+
 /// Configuration for [`spawn`]. Use `None` for `metadata_pass` to disable
 /// the cron entirely (worker-pool-only mode — useful when only the
 /// bookmark-triggered enqueue path is wanted).
@@ -342,9 +351,9 @@ impl WorkerContext {
                     _ = self.cancel.cancelled() => return,
                 }
             }
-            let leases = match jobs::lease(
+            let leases = match jobs::lease_kinds(
                 &self.pool,
-                Some(KIND_SYNC_CHAPTER_CONTENT),
+                &[KIND_SYNC_CHAPTER_CONTENT, KIND_SYNC_MANGA],
                 1,
                 LEASE_DURATION,
             )

backend/src/crawler/jobs.rs

@@ -15,11 +15,18 @@ use uuid::Uuid;
 #[derive(Clone, Debug, Serialize, Deserialize)]
 #[serde(tag = "kind", rename_all = "snake_case")]
 pub enum JobPayload {
-    /// Fetch one manga's detail page, upsert metadata, enqueue
-    /// `SyncChapterList`.
+    /// Fetch one manga's detail page, upsert metadata, sync its chapter
+    /// list. `url` and `title` are carried from the list ref so the worker
+    /// can reconstruct a `SourceMangaRef` without re-walking, and so the
+    /// dead-jobs/history UI can render a label even before any manga row
+    /// exists. `#[serde(default)]` keeps older/hand-inserted rows decodable.
     SyncManga {
         source_id: String,
         source_manga_key: String,
+        #[serde(default)]
+        url: String,
+        #[serde(default)]
+        title: String,
     },
     /// Diff the chapter list, enqueue `SyncChapterContent` for new
     /// chapters, soft-drop vanished ones.
@@ -61,6 +68,11 @@ pub enum JobState {
 /// without re-spelling the literal.
 pub const KIND_SYNC_CHAPTER_CONTENT: &str = "sync_chapter_content";
 
+/// Kind discriminator for manga-detail sync jobs (used by the reconcile
+/// pass to enqueue missing mangas). The crawl worker leases this alongside
+/// `KIND_SYNC_CHAPTER_CONTENT`; both serialize on the single browser.
+pub const KIND_SYNC_MANGA: &str = "sync_manga";
+
 /// Kind discriminator for AI page-analysis jobs. The analysis daemon
 /// leases with this filter so it never contends with crawl jobs.
 pub const KIND_ANALYZE_PAGE: &str = "analyze_page";
@@ -174,6 +186,51 @@ pub async fn lease(
     .fetch_all(pool)
     .await?;
 
+    decode_leases(rows)
+}
+
+/// Like [`lease`] but matches any of several `payload->>'kind'` values. The
+/// crawl worker uses this to drain both `sync_chapter_content` and
+/// `sync_manga` from one loop (both serialize on the single browser); the
+/// analysis daemon keeps using single-kind [`lease`] so it never contends.
+pub async fn lease_kinds(
+    pool: &PgPool,
+    kinds: &[&str],
+    max: i64,
+    lease_duration: Duration,
+) -> sqlx::Result<Vec<Lease>> {
+    let lease_ms: i64 = lease_duration.as_millis().min(i64::MAX as u128) as i64;
+    let kinds_vec: Vec<String> = kinds.iter().map(|s| s.to_string()).collect();
+    let rows: Vec<(Uuid, serde_json::Value, i32, i32)> = sqlx::query_as(
+        r#"
+        WITH leased AS (
+            SELECT id FROM crawler_jobs
+             WHERE (state = 'pending' OR (state = 'running' AND leased_until < now()))
+               AND scheduled_at <= now()
+               AND payload->>'kind' = ANY($1)
+             ORDER BY scheduled_at, created_at
+             LIMIT $2
+             FOR UPDATE SKIP LOCKED
+        )
+        UPDATE crawler_jobs j
+           SET state = 'running',
+               attempts = j.attempts + 1,
+               leased_until = now() + ($3::bigint || ' milliseconds')::interval,
+               updated_at = now()
+          FROM leased l
+         WHERE j.id = l.id
+        RETURNING j.id, j.payload, j.attempts, j.max_attempts
+        "#,
+    )
+    .bind(&kinds_vec)
+    .bind(max)
+    .bind(lease_ms)
+    .fetch_all(pool)
+    .await?;
+    decode_leases(rows)
+}
+
+fn decode_leases(rows: Vec<(Uuid, serde_json::Value, i32, i32)>) -> sqlx::Result<Vec<Lease>> {
     let mut leases = Vec::with_capacity(rows.len());
     for (id, payload_json, attempts, max_attempts) in rows {
         let payload: JobPayload = serde_json::from_value(payload_json).map_err(|e| {
@@ -393,6 +450,60 @@ mod tests {
         }
     }
 
+    #[test]
+    fn sync_manga_payload_round_trips_with_url_and_title() {
+        let payload = JobPayload::SyncManga {
+            source_id: "target".into(),
+            source_manga_key: "foo".into(),
+            url: "https://target.example/manga/foo".into(),
+            title: "Foo Title".into(),
+        };
+        let json = serde_json::to_value(&payload).unwrap();
+        assert_eq!(json["kind"], KIND_SYNC_MANGA);
+        assert_eq!(json["source_id"], "target");
+        assert_eq!(json["source_manga_key"], "foo");
+        assert_eq!(json["url"], "https://target.example/manga/foo");
+        assert_eq!(json["title"], "Foo Title");
+
+        match serde_json::from_value::<JobPayload>(json).unwrap() {
+            JobPayload::SyncManga {
+                source_id,
+                source_manga_key,
+                url,
+                title,
+            } => {
+                assert_eq!(source_id, "target");
+                assert_eq!(source_manga_key, "foo");
+                assert_eq!(url, "https://target.example/manga/foo");
+                assert_eq!(title, "Foo Title");
+            }
+            other => panic!("expected SyncManga, got {other:?}"),
+        }
+    }
+
+    #[test]
+    fn sync_manga_payload_defaults_missing_url_and_title() {
+        // A row that predates the url/title fields must still decode.
+        let legacy = serde_json::json!({
+            "kind": "sync_manga",
+            "source_id": "target",
+            "source_manga_key": "foo",
+        });
+        match serde_json::from_value::<JobPayload>(legacy).unwrap() {
+            JobPayload::SyncManga {
+                url,
+                title,
+                source_manga_key,
+                ..
+            } => {
+                assert_eq!(source_manga_key, "foo");
+                assert_eq!(url, "");
+                assert_eq!(title, "");
+            }
+            other => panic!("expected SyncManga, got {other:?}"),
+        }
+    }
+
     #[test]
     fn backoff_base_grows_exponentially_and_caps_at_one_hour() {
         // attempts == 1 → 60s, doubling each step.

backend/src/crawler/mod.rs

@@ -23,6 +23,7 @@ pub mod jobs;
 pub mod nav;
 pub mod pipeline;
 pub mod rate_limit;
+pub mod reconcile;
 pub mod resync;
 pub mod safety;
 pub mod session;

backend/src/crawler/pipeline.rs

@@ -76,6 +76,213 @@ pub(crate) fn should_abort_pass(consecutive: u32, threshold: u32) -> bool {
     threshold > 0 && consecutive >= threshold
 }
 
+/// Success outcome of [`process_manga_ref`].
+pub(crate) struct RefProcessed {
+    pub manga_id: Uuid,
+    pub status: UpsertStatus,
+    pub chapters_new: Option<usize>,
+    pub cover_fetched: bool,
+}
+
+/// Why [`process_manga_ref`] produced no upsert.
+pub(crate) enum RefError {
+    /// `fetch_manga` itself failed. Counts toward the consecutive-failure
+    /// breaker in the metadata pass; the `SyncManga` worker treats it as a
+    /// retryable job failure.
+    Fetch(anyhow::Error),
+    /// The detail fetched but the ref was skipped — partial-render guard or
+    /// an upsert error. The fetch *succeeded*, so the breaker resets, but no
+    /// manga was upserted.
+    Skip(anyhow::Error),
+}
+
+/// Run fetch → partial-render guard → upsert → cover → chapter-sync for a
+/// single discovered ref. Extracted from [`run_metadata_pass`] so the
+/// `SyncManga` worker drives the identical per-manga work and the two paths
+/// can't drift. Records the detail/cover crawl metrics internally; the
+/// caller owns the discovered/seen/stop/breaker bookkeeping.
+#[allow(clippy::too_many_arguments)]
+pub(crate) async fn process_manga_ref(
+    ctx: &FetchContext<'_>,
+    source: &TargetSource,
+    db: &PgPool,
+    storage: &dyn Storage,
+    http: &reqwest::Client,
+    rate: &HostRateLimiters,
+    r: &SourceMangaRef,
+    skip_chapters: bool,
+    allowlist: &DownloadAllowlist,
+    max_image_bytes: usize,
+    status: Option<&crate::crawler::status::StatusHandle>,
+) -> Result<RefProcessed, RefError> {
+    let source_id = source.id();
+    let detail_started = std::time::Instant::now();
+    let manga = match source.fetch_manga(ctx, r).await {
+        Ok(m) => m,
+        Err(e) => {
+            // Detail-fetch timing (failed). manga_id is unknown — the manga
+            // was never upserted.
+            let _ = repo::crawl_metrics::record(
+                db,
+                repo::crawl_metrics::OP_MANGA_DETAIL,
+                None,
+                None,
+                "failed",
+                detail_started.elapsed().as_millis() as i64,
+                None,
+                Some(&format!("{e:#}")),
+            )
+            .await;
+            return Err(RefError::Fetch(e));
+        }
+    };
+    // Detail fetch succeeded; stash its duration to record once the
+    // manga_id is known (after upsert).
+    let detail_ms = detail_started.elapsed().as_millis() as i64;
+
+    // Partial-render guard: an empty chapter list paired with a prior count
+    // > 0 is overwhelmingly a chromium snapshot taken between the wrapper
+    // render and its rows render. Treat as a transient skip (no upsert) so
+    // a later attempt retries. Skipped in `skip_chapters` mode because the
+    // parser returns an empty Vec there by design.
+    if !skip_chapters && manga.chapters.is_empty() {
+        match repo::crawler::live_chapter_count_for_source_manga(db, source_id, &r.source_manga_key)
+            .await
+        {
+            Ok(prior) if prior > 0 => {
+                return Err(RefError::Skip(anyhow::anyhow!(
+                    "fetch_manga returned empty chapters but prior count {prior} > 0; \
+                     treating as partial-render transient"
+                )));
+            }
+            Ok(_) => {}
+            Err(e) => {
+                // DB lookup failed — fail safe: skip rather than risk a
+                // soft-drop on a manga whose prior count we couldn't confirm.
+                return Err(RefError::Skip(
+                    anyhow::Error::new(e).context("live_chapter_count_for_source_manga"),
+                ));
+            }
+        }
+    }
+
+    let upsert = match repo::crawler::upsert_manga_from_source(db, source_id, &r.url, &manga).await {
+        Ok(u) => u,
+        Err(e) => {
+            return Err(RefError::Skip(
+                anyhow::Error::new(e).context("upsert_manga_from_source"),
+            ));
+        }
+    };
+    // Detail-fetch timing (ok), now that we have the manga_id.
+    let _ = repo::crawl_metrics::record(
+        db,
+        repo::crawl_metrics::OP_MANGA_DETAIL,
+        Some(upsert.manga_id),
+        None,
+        "ok",
+        detail_ms,
+        None,
+        None,
+    )
+    .await;
+    tracing::info!(
+        key = %manga.source_manga_key,
+        manga_id = %upsert.manga_id,
+        status = ?upsert.status,
+        title = %manga.title,
+        "manga upserted"
+    );
+
+    // Cover image: download when missing in storage or when metadata
+    // signaled an update (cover URL is part of metadata_hash, so Updated
+    // implies the URL may have moved). Failures are non-fatal.
+    let mut cover_fetched = false;
+    let needs_cover =
+        upsert.cover_image_path.is_none() || matches!(upsert.status, UpsertStatus::Updated);
+    if needs_cover {
+        if let Some(cover_url) = manga.cover_url.as_deref() {
+            // RAII: the guard clears `current_cover` on every exit path.
+            let _cover_guard = status.map(|s| {
+                s.begin_cover(crate::crawler::status::CoverTarget {
+                    manga_id: upsert.manga_id,
+                    manga_title: manga.title.clone(),
+                })
+            });
+            let cover_started = std::time::Instant::now();
+            let cover_result = download_and_store_cover(
+                db,
+                storage,
+                http,
+                rate,
+                &r.url,
+                upsert.manga_id,
+                cover_url,
+                allowlist,
+                max_image_bytes,
+            )
+            .await;
+            let cover_ms = cover_started.elapsed().as_millis() as i64;
+            let _ = repo::crawl_metrics::record(
+                db,
+                repo::crawl_metrics::OP_MANGA_COVER,
+                Some(upsert.manga_id),
+                None,
+                if cover_result.is_ok() { "ok" } else { "failed" },
+                cover_ms,
+                None,
+                cover_result.as_ref().err().map(|e| format!("{e:#}")).as_deref(),
+            )
+            .await;
+            match cover_result {
+                Ok(()) => cover_fetched = true,
+                Err(e) => tracing::warn!(
+                    manga_id = %upsert.manga_id,
+                    error = ?e,
+                    "cover download failed"
+                ),
+            }
+        }
+    }
+
+    // Chapter sync. `None` (skip_chapters mode, or a logged-and-swallowed
+    // sync error) refuses to stop on this manga because we can't confirm
+    // "no new chapters."
+    let chapters_new: Option<usize> = if skip_chapters {
+        None
+    } else {
+        match repo::crawler::sync_manga_chapters(db, source_id, upsert.manga_id, &manga.chapters)
+            .await
+        {
+            Ok(diff) => {
+                tracing::info!(
+                    manga_id = %upsert.manga_id,
+                    new = diff.new,
+                    refreshed = diff.refreshed,
+                    dropped = diff.dropped,
+                    "chapters synced"
+                );
+                Some(diff.new)
+            }
+            Err(e) => {
+                tracing::warn!(
+                    manga_id = %upsert.manga_id,
+                    error = ?e,
+                    "chapter sync failed"
+                );
+                None
+            }
+        }
+    };
+
+    Ok(RefProcessed {
+        manga_id: upsert.manga_id,
+        status: upsert.status,
+        chapters_new,
+        cover_fetched,
+    })
+}
+
 /// Runs the discover → fetch → upsert → cover → chapter-list-diff pipeline
 /// for the target source. Pure metadata; chapter content is enqueued as
 /// separate `SyncChapterContent` jobs by the caller after this returns.
@@ -244,32 +451,48 @@ pub async fn run_metadata_pass(
                 key = %r.source_manga_key,
                 "fetching metadata"
             );
-            let detail_started = std::time::Instant::now();
-            let manga = match source.fetch_manga(&ctx, &r).await {
-                Ok(m) => {
+            match process_manga_ref(
+                &ctx,
+                &source,
+                db,
+                storage,
+                http,
+                rate,
+                &r,
+                skip_chapters,
+                allowlist,
+                max_image_bytes,
+                status,
+            )
+            .await
+            {
+                Ok(p) => {
                     consecutive_failures = 0;
-                    m
+                    stats.upserted += 1;
+                    if p.cover_fetched {
+                        stats.covers_fetched += 1;
+                    }
+                    // Record success in the dedup set. Cover and chapter-sync
+                    // failures inside process_manga_ref are non-fatal and
+                    // don't roll this back — metadata is the durable source
+                    // of truth for the dedup.
+                    seen.insert(r.source_manga_key.clone());
+                    if should_stop(was_clean, p.status, p.chapters_new) {
+                        hit_stop_condition = true;
+                        tracing::info!(
+                            key = %r.source_manga_key,
+                            "stop condition met (Unchanged metadata + 0 new chapters); halting walk"
+                        );
+                        break 'outer;
+                    }
                 }
-                Err(e) => {
+                Err(RefError::Fetch(e)) => {
                     tracing::warn!(
                         key = %r.source_manga_key,
                         url = %r.url,
                         error = ?e,
                         "fetch_manga failed"
                     );
-                    // Detail-fetch timing (failed). manga_id is unknown — the
-                    // manga was never upserted.
-                    let _ = repo::crawl_metrics::record(
-                        db,
-                        repo::crawl_metrics::OP_MANGA_DETAIL,
-                        None,
-                        None,
-                        "failed",
-                        detail_started.elapsed().as_millis() as i64,
-                        None,
-                        Some(&format!("{e:#}")),
-                    )
-                    .await;
                     stats.mangas_failed += 1;
                     consecutive_failures += 1;
                     if should_abort_pass(consecutive_failures, max_consecutive_failures) {
@@ -282,191 +505,19 @@ pub async fn run_metadata_pass(
                         );
                         break 'outer;
                     }
-                    continue;
                 }
-            };
-            // Detail fetch succeeded; stash its duration to record once the
-            // manga_id is known (after upsert).
-            let detail_ms = detail_started.elapsed().as_millis() as i64;
-
-            // Partial-render guard: an empty chapter list paired with a
-            // prior count > 0 is overwhelmingly a chromium snapshot
-            // taken between the #chapter_table wrapper render and its
-            // rows render. The wait_for_selector wait in `navigate`
-            // narrows this window but cannot close it for slow renders
-            // beyond the selector budget. Treat as a transient failure
-            // here — skip upsert, skip seen.insert — so the next batch
-            // (or the next tick) retries. Skipped in `skip_chapters`
-            // mode because the parser is configured to return an empty
-            // Vec by design there.
-            if !skip_chapters && manga.chapters.is_empty() {
-                match repo::crawler::live_chapter_count_for_source_manga(
-                    db, source_id, &r.source_manga_key,
-                )
-                .await
-                {
-                    Ok(prior) if prior > 0 => {
-                        tracing::warn!(
-                            key = %r.source_manga_key,
-                            url = %r.url,
-                            prior_chapter_count = prior,
-                            "fetch_manga returned empty chapters but prior count > 0; treating as partial-render transient and skipping"
-                        );
-                        stats.mangas_failed += 1;
-                        continue;
-                    }
-                    Ok(_) => {}
-                    Err(e) => {
-                        // DB lookup failed — fail safe: skip rather
-                        // than risk a soft-drop on a manga whose prior
-                        // count we couldn't confirm.
-                        tracing::warn!(
-                            key = %r.source_manga_key,
-                            error = ?e,
-                            "live_chapter_count_for_source_manga failed; skipping cautiously"
-                        );
-                        stats.mangas_failed += 1;
-                        continue;
-                    }
-                }
-            }
-
-            let upsert = match repo::crawler::upsert_manga_from_source(
-                db, source_id, &r.url, &manga,
-            )
-            .await
-            {
-                Ok(u) => u,
-                Err(e) => {
-                    tracing::error!(
+                Err(RefError::Skip(e)) => {
+                    // Fetch succeeded (so the breaker resets) but the ref was
+                    // skipped — partial render or upsert error. Left out of
+                    // `seen` so a reappearance in a later batch retries.
+                    tracing::warn!(
                         key = %r.source_manga_key,
                         error = ?e,
-                        "upsert_manga_from_source failed"
+                        "manga ref skipped (partial-render or upsert error)"
                     );
+                    consecutive_failures = 0;
                     stats.mangas_failed += 1;
-                    continue;
                 }
-            };
-            stats.upserted += 1;
-            // Detail-fetch timing (ok), now that we have the manga_id.
-            let _ = repo::crawl_metrics::record(
-                db,
-                repo::crawl_metrics::OP_MANGA_DETAIL,
-                Some(upsert.manga_id),
-                None,
-                "ok",
-                detail_ms,
-                None,
-                None,
-            )
-            .await;
-            // Record success in the dedup set. Cover and chapter-sync
-            // failures below are non-fatal and don't roll this back —
-            // metadata is the durable source of truth for the dedup.
-            seen.insert(r.source_manga_key.clone());
-            tracing::info!(
-                key = %manga.source_manga_key,
-                manga_id = %upsert.manga_id,
-                status = ?upsert.status,
-                title = %manga.title,
-                "manga upserted"
-            );
-
-            // Cover image: download when missing in storage or when metadata
-            // signaled an update (cover URL is part of metadata_hash, so
-            // Updated implies the URL may have moved). Failures are non-fatal.
-            let needs_cover = upsert.cover_image_path.is_none()
-                || matches!(upsert.status, repo::crawler::UpsertStatus::Updated);
-            if needs_cover {
-                if let Some(cover_url) = manga.cover_url.as_deref() {
-                    // RAII: the guard clears `current_cover` on every
-                    // exit path (success, panic, future early-return).
-                    // Mirrors the chapter-side ChapterGuard.
-                    let _cover_guard = status.map(|s| {
-                        s.begin_cover(crate::crawler::status::CoverTarget {
-                            manga_id: upsert.manga_id,
-                            manga_title: manga.title.clone(),
-                        })
-                    });
-                    let cover_started = std::time::Instant::now();
-                    let cover_result = download_and_store_cover(
-                        db,
-                        storage,
-                        http,
-                        rate,
-                        &r.url,
-                        upsert.manga_id,
-                        cover_url,
-                        allowlist,
-                        max_image_bytes,
-                    )
-                    .await;
-                    let cover_ms = cover_started.elapsed().as_millis() as i64;
-                    let _ = repo::crawl_metrics::record(
-                        db,
-                        repo::crawl_metrics::OP_MANGA_COVER,
-                        Some(upsert.manga_id),
-                        None,
-                        if cover_result.is_ok() { "ok" } else { "failed" },
-                        cover_ms,
-                        None,
-                        cover_result.as_ref().err().map(|e| format!("{e:#}")).as_deref(),
-                    )
-                    .await;
-                    match cover_result {
-                        Ok(()) => stats.covers_fetched += 1,
-                        Err(e) => tracing::warn!(
-                            manga_id = %upsert.manga_id,
-                            error = ?e,
-                            "cover download failed"
-                        ),
-                    }
-                }
-            }
-
-            // Chapter sync. `chapters_new` feeds the stop check below:
-            // `None` (skip_chapters mode, or a logged-and-swallowed sync
-            // error) refuses to stop on this manga because we can't
-            // confirm "no new chapters."
-            let chapters_new: Option<usize> = if skip_chapters {
-                None
-            } else {
-                match repo::crawler::sync_manga_chapters(
-                    db,
-                    source_id,
-                    upsert.manga_id,
-                    &manga.chapters,
-                )
-                .await
-                {
-                    Ok(diff) => {
-                        tracing::info!(
-                            manga_id = %upsert.manga_id,
-                            new = diff.new,
-                            refreshed = diff.refreshed,
-                            dropped = diff.dropped,
-                            "chapters synced"
-                        );
-                        Some(diff.new)
-                    }
-                    Err(e) => {
-                        tracing::warn!(
-                            manga_id = %upsert.manga_id,
-                            error = ?e,
-                            "chapter sync failed"
-                        );
-                        None
-                    }
-                }
-            };
-
-            if should_stop(was_clean, upsert.status, chapters_new) {
-                hit_stop_condition = true;
-                tracing::info!(
-                    key = %manga.source_manga_key,
-                    "stop condition met (Unchanged metadata + 0 new chapters); halting walk"
-                );
-                break 'outer;
             }
         }
     }

backend/src/crawler/reconcile.rs

@@ -0,0 +1,260 @@
+//! Reconcile pass — find mangas the metadata pass missed.
+//!
+//! The interleaved metadata pass ([`crate::crawler::pipeline`]) walks the
+//! source list newest-first and visits each manga inline, which makes it
+//! vulnerable to list drift: a manga can slip a pagination slot while the
+//! walk spends minutes on detail work, and never get upserted.
+//!
+//! Reconcile fixes that with a cheap, full, unconditional list-only walk
+//! (refs only — no `fetch_manga`, no early stop), set-diffs the walked keys
+//! against `manga_sources`, and enqueues the strictly-missing ones as
+//! `SyncManga` jobs for the crawl worker to visit. A set-diff is immune to
+//! drift: a manga only has to appear *somewhere* in the list, not survive a
+//! specific slot during a slow walk.
+//!
+//! Identity matches the DB exactly because both sides derive the key the
+//! same way: the walker's refs carry `source_manga_key =
+//! derive_key_from_url(list_href)`, which is precisely what
+//! `manga_sources.source_manga_key` stores.
+
+use std::collections::HashSet;
+
+use anyhow::Context;
+use sqlx::PgPool;
+
+use crate::crawler::browser_manager::BrowserManager;
+use crate::crawler::jobs::{self, EnqueueResult, JobPayload};
+use crate::crawler::rate_limit::HostRateLimiters;
+use crate::crawler::source::target::TargetSource;
+use crate::crawler::source::{FetchContext, Source, SourceMangaRef};
+use crate::crawler::status::Phase;
+use crate::repo;
+use crate::repo::crawler::ensure_source;
+
+/// Counters surfaced when a reconcile pass finishes.
+#[derive(Debug, Default, Clone, Copy)]
+pub struct ReconcileStats {
+    /// Distinct refs collected from the full list walk.
+    pub walked: usize,
+    /// Walked keys with no `manga_sources` row (strict `NOT EXISTS`).
+    pub missing: usize,
+    /// Missing mangas newly enqueued as `SyncManga` jobs this pass.
+    pub enqueued: usize,
+    /// Missing mangas skipped because a blocking (pending/running/dead)
+    /// `SyncManga` job already exists, or the enqueue lost an insert race.
+    pub skipped: usize,
+}
+
+/// Pure set-diff: which walked refs should be enqueued. A ref is selected
+/// when its key is neither already in the DB (`existing`) nor already has a
+/// blocking job (`blocked`). Repeated keys in `walked` (source index drift
+/// can surface the same manga twice) are de-duplicated — the first ref wins.
+pub(crate) fn select_missing<'a>(
+    walked: &'a [SourceMangaRef],
+    existing: &HashSet<String>,
+    blocked: &HashSet<String>,
+) -> Vec<&'a SourceMangaRef> {
+    let mut seen = HashSet::new();
+    let mut out = Vec::new();
+    for r in walked {
+        if existing.contains(&r.source_manga_key) || blocked.contains(&r.source_manga_key) {
+            continue;
+        }
+        if seen.insert(r.source_manga_key.clone()) {
+            out.push(r);
+        }
+    }
+    out
+}
+
+/// Run a full list-only walk, diff against the DB, and enqueue missing
+/// mangas as `SyncManga` jobs. Holds the (exclusive) browser lease only for
+/// the cheap walk; the enqueued jobs are drained later by the crawl worker.
+#[allow(clippy::too_many_arguments)]
+pub async fn reconcile_missing(
+    browser_manager: &BrowserManager,
+    db: &PgPool,
+    rate: &HostRateLimiters,
+    start_url: &str,
+    status: Option<&crate::crawler::status::StatusHandle>,
+    tor: Option<&crate::crawler::tor::TorController>,
+) -> anyhow::Result<ReconcileStats> {
+    let lease = browser_manager
+        .acquire()
+        .await
+        .context("acquire browser lease for reconcile pass")?;
+    let browser_ref: &chromiumoxide::Browser = &lease;
+    if let Some(s) = status {
+        s.set_phase(Phase::Reconciling {
+            walked: 0,
+            enqueued: 0,
+        })
+        .await;
+    }
+
+    // Chapter parsing is irrelevant here (we never call fetch_manga); the
+    // metadata-only constructor is intent-revealing and harmless.
+    let source = TargetSource::new(start_url.to_string()).without_chapter_parsing();
+    let ctx = FetchContext {
+        browser: browser_ref,
+        rate,
+        tor,
+    };
+    let source_id = source.id();
+    ensure_source(
+        db,
+        source_id,
+        "Target Site",
+        &crate::crawler::url_utils::origin_of(start_url).unwrap_or_else(|| start_url.to_string()),
+    )
+    .await
+    .context("ensure_source")?;
+
+    tracing::info!("starting reconcile pass (full list-only walk)");
+    let mut walker = source.discover(&ctx).await.context("discover failed")?;
+
+    // Full unconditional walk: collect every ref, no early stop. Yield the
+    // lease if a coordinated browser restart is pending so the drain isn't
+    // stalled — the missing set we've gathered so far is still enqueued.
+    let mut walked: Vec<SourceMangaRef> = Vec::new();
+    'outer: loop {
+        if browser_manager.is_restart_pending() {
+            tracing::info!("reconcile pass: browser restart pending — yielding partial walk");
+            break;
+        }
+        match walker.next_batch(&ctx).await? {
+            Some(batch) => {
+                for r in batch {
+                    walked.push(r);
+                }
+                if let Some(s) = status {
+                    s.set_phase(Phase::Reconciling {
+                        walked: walked.len(),
+                        enqueued: 0,
+                    })
+                    .await;
+                }
+                if browser_manager.is_restart_pending() {
+                    tracing::info!(
+                        "reconcile pass: browser restart pending mid-batch — yielding partial walk"
+                    );
+                    break 'outer;
+                }
+            }
+            None => break,
+        }
+    }
+    // Browser work is done — release before the (browser-free) diff+enqueue.
+    drop(lease);
+
+    let existing = repo::crawler::existing_source_keys(db, source_id)
+        .await
+        .context("existing_source_keys")?;
+    let blocked = repo::crawler::sync_manga_keys_with_blocking_job(db, source_id)
+        .await
+        .context("sync_manga_keys_with_blocking_job")?;
+
+    let missing = select_missing(&walked, &existing, &blocked);
+
+    let mut stats = ReconcileStats {
+        walked: walked.len(),
+        missing: missing.len(),
+        ..Default::default()
+    };
+    for r in missing {
+        let payload = JobPayload::SyncManga {
+            source_id: source_id.to_string(),
+            source_manga_key: r.source_manga_key.clone(),
+            url: r.url.clone(),
+            title: r.title.clone(),
+        };
+        match jobs::enqueue(db, &payload).await {
+            Ok(EnqueueResult::Inserted(_)) => stats.enqueued += 1,
+            Ok(EnqueueResult::Skipped) => stats.skipped += 1,
+            Err(e) => {
+                tracing::warn!(key = %r.source_manga_key, error = ?e, "enqueue SyncManga failed");
+                stats.skipped += 1;
+            }
+        }
+        if let Some(s) = status {
+            s.set_phase(Phase::Reconciling {
+                walked: stats.walked,
+                enqueued: stats.enqueued,
+            })
+            .await;
+        }
+    }
+
+    tracing::info!(
+        walked = stats.walked,
+        missing = stats.missing,
+        enqueued = stats.enqueued,
+        skipped = stats.skipped,
+        "reconcile pass complete"
+    );
+    Ok(stats)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn r(key: &str) -> SourceMangaRef {
+        SourceMangaRef {
+            source_manga_key: key.to_string(),
+            title: format!("Title {key}"),
+            url: format!("https://target.example/manga/{key}"),
+        }
+    }
+
+    fn set(keys: &[&str]) -> HashSet<String> {
+        keys.iter().map(|s| s.to_string()).collect()
+    }
+
+    #[test]
+    fn select_missing_returns_keys_not_in_manga_sources() {
+        let walked = vec![r("a"), r("b"), r("c")];
+        let existing = set(&["b"]);
+        let blocked = set(&[]);
+        let got: Vec<&str> = select_missing(&walked, &existing, &blocked)
+            .iter()
+            .map(|r| r.source_manga_key.as_str())
+            .collect();
+        assert_eq!(got, vec!["a", "c"]);
+    }
+
+    #[test]
+    fn select_missing_treats_dropped_rows_as_present() {
+        // The caller passes dropped keys in `existing` (existing_source_keys
+        // does not filter dropped_at), so a dropped manga is NOT re-enqueued.
+        let walked = vec![r("a"), r("dropped")];
+        let existing = set(&["dropped"]);
+        let got: Vec<&str> = select_missing(&walked, &existing, &set(&[]))
+            .iter()
+            .map(|r| r.source_manga_key.as_str())
+            .collect();
+        assert_eq!(got, vec!["a"]);
+    }
+
+    #[test]
+    fn select_missing_skips_keys_with_blocking_job() {
+        let walked = vec![r("a"), r("queued"), r("dead")];
+        let blocked = set(&["queued", "dead"]);
+        let got: Vec<&str> = select_missing(&walked, &set(&[]), &blocked)
+            .iter()
+            .map(|r| r.source_manga_key.as_str())
+            .collect();
+        assert_eq!(got, vec!["a"]);
+    }
+
+    #[test]
+    fn select_missing_dedups_repeated_walked_keys() {
+        // Index drift can surface the same manga twice in one walk.
+        let walked = vec![r("a"), r("a"), r("b")];
+        let got: Vec<&str> = select_missing(&walked, &set(&[]), &set(&[]))
+            .iter()
+            .map(|r| r.source_manga_key.as_str())
+            .collect();
+        assert_eq!(got, vec!["a", "b"]);
+    }
+}

backend/src/crawler/status.rs

@@ -41,6 +41,10 @@ pub enum Phase {
     /// Backfilling covers that failed on first attempt. `index`/`total`
     /// track progress through this tick's batch.
     CoverBackfill { index: usize, total: usize },
+    /// Reconcile pass: walking the full source list (refs only, no detail
+    /// visit) to find mangas missing from the DB. `walked` is refs seen so
+    /// far this walk; `enqueued` is missing mangas queued as `SyncManga`.
+    Reconciling { walked: usize, enqueued: usize },
 }
 
 /// A chapter being downloaded right now, with a live page count. Keyed in

backend/src/domain/crawl_metrics.rs

@@ -11,6 +11,20 @@ use serde::Serialize;
 use sqlx::FromRow;
 use uuid::Uuid;
 
+/// One time bucket of a metrics series — count, ok/failed split, and mean
+/// duration over the bucket. Shared by the crawl-ops and analysis trend
+/// charts (both are `{t, n, ok, failed, avg_ms}` over a `date_trunc` window).
+/// Empty intervals are simply absent; the client fills the continuous axis.
+#[derive(Debug, Clone, Serialize, FromRow)]
+pub struct MetricsBucket {
+    /// Bucket start (`date_trunc(unit, finished_at|analyzed_at)`).
+    pub t: DateTime<Utc>,
+    pub n: i64,
+    pub ok: i64,
+    pub failed: i64,
+    pub avg_ms: Option<f64>,
+}
+
 /// Per-operation-type average roll-up over a time window.
 #[derive(Debug, Clone, Serialize, FromRow)]
 pub struct OpSummary {

backend/src/repo/admin_audit.rs

@@ -1,14 +1,98 @@
-//! Admin-action audit log writes.
+//! Admin-action audit log writes + the admin-facing read query.
 //!
 //! Insert is always called from inside the same transaction as the
 //! action it audits — the executor parameter is `PgExecutor` so the
-//! caller passes `&mut *tx` directly.
+//! caller passes `&mut *tx` directly. [`list`] backs the audit-log viewer.
 
-use sqlx::PgExecutor;
+use chrono::{DateTime, Utc};
+use serde::Serialize;
+use sqlx::{FromRow, PgExecutor, PgPool};
 use uuid::Uuid;
 
 use crate::error::AppResult;
 
+/// One audit row joined to the actor's current username (NULL when the
+/// actor account was deleted — `actor_user_id` is `ON DELETE SET NULL`).
+#[derive(Debug, Clone, Serialize, FromRow)]
+pub struct AuditEntryRow {
+    pub id: Uuid,
+    pub actor_user_id: Option<Uuid>,
+    pub actor_username: Option<String>,
+    pub action: String,
+    pub target_kind: String,
+    pub target_id: Option<Uuid>,
+    pub payload: serde_json::Value,
+    pub at: DateTime<Utc>,
+}
+
+/// Optional filters for [`list`]. `None`/absent widens the scope; an
+/// empty-string action/target_kind is treated as absent by the caller.
+#[derive(Debug, Default, Clone)]
+pub struct AuditFilter<'a> {
+    pub action: Option<&'a str>,
+    pub target_kind: Option<&'a str>,
+    pub actor_user_id: Option<Uuid>,
+    pub since: Option<DateTime<Utc>>,
+}
+
+/// Paginated, newest-first audit log. Returns the page slice plus the
+/// filtered total. Ordering by `at DESC` uses `admin_audit_at_idx`.
+pub async fn list(
+    pool: &PgPool,
+    filter: AuditFilter<'_>,
+    limit: i64,
+    offset: i64,
+) -> AppResult<(Vec<AuditEntryRow>, i64)> {
+    let items = sqlx::query_as::<_, AuditEntryRow>(
+        r#"
+        SELECT
+            a.id,
+            a.actor_user_id,
+            u.username        AS actor_username,
+            a.action,
+            a.target_kind,
+            a.target_id,
+            a.payload,
+            a.at
+          FROM admin_audit a
+          LEFT JOIN users u ON u.id = a.actor_user_id
+         WHERE ($1::text IS NULL OR a.action = $1)
+           AND ($2::text IS NULL OR a.target_kind = $2)
+           AND ($3::uuid IS NULL OR a.actor_user_id = $3)
+           AND ($4::timestamptz IS NULL OR a.at >= $4)
+         ORDER BY a.at DESC
+         LIMIT $5 OFFSET $6
+        "#,
+    )
+    .bind(filter.action)
+    .bind(filter.target_kind)
+    .bind(filter.actor_user_id)
+    .bind(filter.since)
+    .bind(limit)
+    .bind(offset)
+    .fetch_all(pool)
+    .await?;
+
+    let (total,): (i64,) = sqlx::query_as(
+        r#"
+        SELECT COUNT(*)
+          FROM admin_audit a
+         WHERE ($1::text IS NULL OR a.action = $1)
+           AND ($2::text IS NULL OR a.target_kind = $2)
+           AND ($3::uuid IS NULL OR a.actor_user_id = $3)
+           AND ($4::timestamptz IS NULL OR a.at >= $4)
+        "#,
+    )
+    .bind(filter.action)
+    .bind(filter.target_kind)
+    .bind(filter.actor_user_id)
+    .bind(filter.since)
+    .fetch_one(pool)
+    .await?;
+
+    Ok((items, total))
+}
+
 pub async fn insert<'e, E: PgExecutor<'e>>(
     executor: E,
     actor_user_id: Uuid,

backend/src/repo/crawl_metrics.rs

@@ -8,7 +8,24 @@ use chrono::{DateTime, Utc};
 use sqlx::PgPool;
 use uuid::Uuid;
 
-use crate::domain::crawl_metrics::{OpRow, OpSummary};
+use crate::domain::crawl_metrics::{MetricsBucket, OpRow, OpSummary};
+
+/// Time-bucket granularity for trend series. A closed enum (not a free
+/// string) so the `date_trunc` unit can never be attacker-controlled.
+#[derive(Debug, Clone, Copy)]
+pub enum Bucket {
+    Hour,
+    Day,
+}
+
+impl Bucket {
+    pub fn as_str(self) -> &'static str {
+        match self {
+            Bucket::Hour => "hour",
+            Bucket::Day => "day",
+        }
+    }
+}
 
 /// Operation kinds, kept as consts so call sites and the CHECK constraint
 /// don't drift from a free-typed literal.
@@ -75,6 +92,34 @@ pub async fn summary(
     .await
 }
 
+/// Bucketed throughput/success/duration series over an optional window.
+/// Plain `GROUP BY date_trunc(...)` — empty intervals are absent and the
+/// client fills the continuous axis. Uses `crawl_metrics_time_idx`.
+pub async fn series(
+    pool: &PgPool,
+    bucket: Bucket,
+    since: Option<DateTime<Utc>>,
+) -> sqlx::Result<Vec<MetricsBucket>> {
+    sqlx::query_as::<_, MetricsBucket>(
+        r#"
+        SELECT
+            date_trunc($1, finished_at)                  AS t,
+            COUNT(*)                                     AS n,
+            COUNT(*) FILTER (WHERE outcome = 'ok')       AS ok,
+            COUNT(*) FILTER (WHERE outcome = 'failed')   AS failed,
+            AVG(duration_ms)::float8                     AS avg_ms
+          FROM crawl_metrics
+         WHERE ($2::timestamptz IS NULL OR finished_at >= $2)
+         GROUP BY t
+         ORDER BY t
+        "#,
+    )
+    .bind(bucket.as_str())
+    .bind(since)
+    .fetch_all(pool)
+    .await
+}
+
 /// Filters for [`list_ops`]. `None`/empty widens the scope.
 #[derive(Debug, Default, Clone)]
 pub struct OpFilter<'a> {

backend/src/repo/crawler.rs

@@ -619,6 +619,67 @@ pub async fn last_run_completed_cleanly(
         .unwrap_or(true))
 }
 
+/// Timestamp of the most recent metadata-pass cron tick, or `None` if the
+/// daemon has never ticked (fresh DB / cron disabled). Stored by the daemon
+/// under `crawler_state['last_metadata_tick_at']` as `{"at": <rfc3339>}`.
+/// Used by the health check that flags a stale/stuck cron.
+pub async fn last_metadata_tick_at(
+    pool: &PgPool,
+) -> sqlx::Result<Option<DateTime<Utc>>> {
+    let row: Option<serde_json::Value> =
+        sqlx::query_scalar("SELECT value FROM crawler_state WHERE key = 'last_metadata_tick_at'")
+            .fetch_optional(pool)
+            .await?;
+    Ok(row.and_then(|v| {
+        v.get("at")
+            .and_then(|s| s.as_str())
+            .and_then(|s| DateTime::parse_from_rfc3339(s).ok())
+            .map(|dt| dt.with_timezone(&Utc))
+    }))
+}
+
+// ---------------------------------------------------------------------------
+// Reconcile: find source-list mangas missing from the DB.
+// ---------------------------------------------------------------------------
+
+/// All `source_manga_key`s we have a `manga_sources` row for under
+/// `source_id`. Intentionally **not** filtered by `dropped_at`: a
+/// soft-dropped row still counts as "present" so reconcile only enqueues
+/// mangas it has truly never seen (strict `NOT EXISTS`).
+pub async fn existing_source_keys(
+    pool: &PgPool,
+    source_id: &str,
+) -> sqlx::Result<std::collections::HashSet<String>> {
+    let rows: Vec<String> =
+        sqlx::query_scalar("SELECT source_manga_key FROM manga_sources WHERE source_id = $1")
+            .bind(source_id)
+            .fetch_all(pool)
+            .await?;
+    Ok(rows.into_iter().collect())
+}
+
+/// `source_manga_key`s that already have a `SyncManga` job in a state that
+/// should block re-enqueue: `pending`/`running` (in flight) **and** `dead`
+/// (leave-dead — a gone manga is not retried by a later reconcile). `done`
+/// and `failed` (mid-backoff) do not block.
+pub async fn sync_manga_keys_with_blocking_job(
+    pool: &PgPool,
+    source_id: &str,
+) -> sqlx::Result<std::collections::HashSet<String>> {
+    let rows: Vec<String> = sqlx::query_scalar(
+        "SELECT DISTINCT payload->>'source_manga_key' \
+           FROM crawler_jobs \
+          WHERE payload->>'kind' = 'sync_manga' \
+            AND payload->>'source_id' = $1 \
+            AND state IN ('pending', 'running', 'dead') \
+            AND payload->>'source_manga_key' IS NOT NULL",
+    )
+    .bind(source_id)
+    .fetch_all(pool)
+    .await?;
+    Ok(rows.into_iter().collect())
+}
+
 // ---------------------------------------------------------------------------
 // Dead-letter jobs: admin observability + requeue.
 // ---------------------------------------------------------------------------
@@ -635,6 +696,14 @@ pub struct DeadJob {
     pub manga_id: Option<Uuid>,
     pub manga_title: Option<String>,
     pub chapter_number: Option<i32>,
+    /// Title carried in the job payload. For `sync_manga` jobs whose manga
+    /// was never upserted there is no `manga_id`/`manga_title`, so the UI
+    /// falls back to this.
+    pub payload_title: Option<String>,
+    /// Source detail URL carried in the payload (currently `sync_manga`).
+    pub source_url: Option<String>,
+    /// Source-native key carried in the payload (currently `sync_manga`).
+    pub source_key: Option<String>,
     pub attempts: i32,
     pub max_attempts: i32,
     pub last_error: Option<String>,
@@ -663,6 +732,9 @@ pub async fn list_dead_jobs(
             c.manga_id                                AS manga_id,
             m.title                                   AS manga_title,
             c.number                                  AS chapter_number,
+            cj.payload->>'title'                      AS payload_title,
+            cj.payload->>'url'                        AS source_url,
+            cj.payload->>'source_manga_key'           AS source_key,
             cj.attempts,
             cj.max_attempts,
             cj.last_error,
@@ -671,7 +743,7 @@ pub async fn list_dead_jobs(
           LEFT JOIN chapters c ON c.id = (cj.payload->>'chapter_id')::uuid
           LEFT JOIN mangas m   ON m.id = c.manga_id
          WHERE cj.state = 'dead'
-           AND ($1::text IS NULL OR m.title ILIKE $1)
+           AND ($1::text IS NULL OR m.title ILIKE $1 OR cj.payload->>'title' ILIKE $1)
          ORDER BY cj.updated_at DESC
          LIMIT $2 OFFSET $3
         "#,
@@ -689,7 +761,7 @@ pub async fn list_dead_jobs(
           LEFT JOIN chapters c ON c.id = (cj.payload->>'chapter_id')::uuid
           LEFT JOIN mangas m   ON m.id = c.manga_id
          WHERE cj.state = 'dead'
-           AND ($1::text IS NULL OR m.title ILIKE $1)
+           AND ($1::text IS NULL OR m.title ILIKE $1 OR cj.payload->>'title' ILIKE $1)
         "#,
     )
     .bind(&search_pat)
@@ -799,6 +871,11 @@ pub struct JobHistoryRow {
     pub page_number: Option<i32>,
     /// Source-side key, the only target a `sync_manga` job carries.
     pub source_key: Option<String>,
+    /// Title carried in the payload — the display fallback for `sync_manga`
+    /// jobs whose manga was never upserted (no `manga_title`).
+    pub payload_title: Option<String>,
+    /// Source detail URL carried in the payload (currently `sync_manga`).
+    pub source_url: Option<String>,
     pub attempts: i32,
     pub max_attempts: i32,
     pub last_error: Option<String>,
@@ -855,6 +932,8 @@ pub async fn list_job_history(
             c.number                                                  AS chapter_number,
             pg.page_number                                            AS page_number,
             cj.payload->>'source_manga_key'                           AS source_key,
+            cj.payload->>'title'                                      AS payload_title,
+            cj.payload->>'url'                                        AS source_url,
             cj.attempts,
             cj.max_attempts,
             cj.last_error,
@@ -873,7 +952,7 @@ pub async fn list_job_history(
           ) cm ON true
          WHERE ($1::text IS NULL OR cj.state = $1)
            AND ($2::text IS NULL OR cj.payload->>'kind' = $2)
-           AND ($3::text IS NULL OR m.title ILIKE $3)
+           AND ($3::text IS NULL OR m.title ILIKE $3 OR cj.payload->>'title' ILIKE $3)
          ORDER BY cj.updated_at DESC
          LIMIT $4 OFFSET $5
         "#,
@@ -895,7 +974,7 @@ pub async fn list_job_history(
           LEFT JOIN mangas m    ON m.id = COALESCE(c.manga_id, (cj.payload->>'manga_id')::uuid)
          WHERE ($1::text IS NULL OR cj.state = $1)
            AND ($2::text IS NULL OR cj.payload->>'kind' = $2)
-           AND ($3::text IS NULL OR m.title ILIKE $3)
+           AND ($3::text IS NULL OR m.title ILIKE $3 OR cj.payload->>'title' ILIKE $3)
         "#,
     )
     .bind(filter.state)

backend/src/repo/page_analysis.rs

@@ -495,6 +495,39 @@ pub async fn analysis_metrics(
     Ok(AnalysisMetrics { n, ok, failed, avg_ms, by_model })
 }
 
+/// Bucketed analysis throughput/success/duration series over an optional
+/// window, for the Analysis-tab trend charts. `ok`/`failed` follow the
+/// `done`/`failed` statuses; mean duration is over completed pages only.
+/// Empty intervals are absent (client fills the axis). The
+/// `page_analysis_analyzed_at_idx` (migration 0030) backs the scan.
+pub async fn analysis_series(
+    pool: &PgPool,
+    bucket: crate::repo::crawl_metrics::Bucket,
+    since: Option<DateTime<Utc>>,
+) -> AppResult<Vec<crate::domain::crawl_metrics::MetricsBucket>> {
+    let rows = sqlx::query_as::<_, crate::domain::crawl_metrics::MetricsBucket>(
+        r#"
+        SELECT
+            date_trunc($1, analyzed_at)                          AS t,
+            COUNT(*)                                             AS n,
+            COUNT(*) FILTER (WHERE status = 'done')              AS ok,
+            COUNT(*) FILTER (WHERE status = 'failed')            AS failed,
+            AVG(duration_ms) FILTER (WHERE status = 'done')::float8 AS avg_ms
+          FROM page_analysis
+         WHERE status <> 'pending'
+           AND analyzed_at IS NOT NULL
+           AND ($2::timestamptz IS NULL OR analyzed_at >= $2)
+         GROUP BY t
+         ORDER BY t
+        "#,
+    )
+    .bind(bucket.as_str())
+    .bind(since)
+    .fetch_all(pool)
+    .await?;
+    Ok(rows)
+}
+
 /// Persist a completed analysis for a page, replacing any previous result.
 ///
 /// The model's free-form `kind` / `content_type` strings are mapped onto

backend/tests/admin_metrics_series.rs

@@ -0,0 +1,194 @@
+//! Integration tests for the bucketed trend-series queries + endpoints:
+//! `repo::crawl_metrics::series`, `repo::page_analysis::analysis_series`, and
+//! `GET /v1/admin/{crawler,analysis}/metrics/series`.
+
+mod common;
+
+use axum::http::StatusCode;
+use axum::Router;
+use sqlx::PgPool;
+use tower::ServiceExt;
+use uuid::Uuid;
+
+use common::{body_json, get_with_cookie, harness, register_user};
+use mangalord::repo::crawl_metrics::{self, Bucket};
+use mangalord::repo::page_analysis;
+
+async fn seed_admin(pool: &PgPool, app: &Router) -> String {
+    let (username, cookie) = register_user(app).await;
+    let u = mangalord::repo::user::find_by_username(pool, &username)
+        .await
+        .unwrap()
+        .unwrap();
+    mangalord::repo::user::set_is_admin_unchecked(pool, u.id, true)
+        .await
+        .unwrap();
+    cookie
+}
+
+async fn insert_metric(pool: &PgPool, outcome: &str, duration_ms: i64, finished_at: &str) {
+    sqlx::query(
+        "INSERT INTO crawl_metrics (op, outcome, duration_ms, finished_at) \
+         VALUES ('manga_detail', $1, $2, $3::timestamptz)",
+    )
+    .bind(outcome)
+    .bind(duration_ms)
+    .bind(finished_at)
+    .execute(pool)
+    .await
+    .unwrap();
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn crawl_series_buckets_by_hour_and_day(pool: PgPool) {
+    // Two rows in hour 09, one in hour 10 (same day).
+    insert_metric(&pool, "ok", 100, "2026-06-18T09:10:00Z").await;
+    insert_metric(&pool, "failed", 300, "2026-06-18T09:50:00Z").await;
+    insert_metric(&pool, "ok", 200, "2026-06-18T10:05:00Z").await;
+
+    let hourly = crawl_metrics::series(&pool, Bucket::Hour, None).await.unwrap();
+    assert_eq!(hourly.len(), 2, "two hour buckets");
+    // Ordered ascending; first bucket = hour 09 with 2 rows (1 ok / 1 failed).
+    assert_eq!(hourly[0].n, 2);
+    assert_eq!(hourly[0].ok, 1);
+    assert_eq!(hourly[0].failed, 1);
+    assert_eq!(hourly[0].avg_ms, Some(200.0)); // (100+300)/2
+    assert_eq!(hourly[1].n, 1);
+
+    let daily = crawl_metrics::series(&pool, Bucket::Day, None).await.unwrap();
+    assert_eq!(daily.len(), 1, "all three collapse into one day bucket");
+    assert_eq!(daily[0].n, 3);
+    assert_eq!(daily[0].failed, 1);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn crawl_series_respects_since_window(pool: PgPool) {
+    insert_metric(&pool, "ok", 100, "2020-01-01T00:00:00Z").await; // ancient
+    insert_metric(&pool, "ok", 100, "2026-06-18T10:00:00Z").await; // recent
+    let since = chrono::DateTime::parse_from_rfc3339("2026-01-01T00:00:00Z")
+        .unwrap()
+        .with_timezone(&chrono::Utc);
+    let got = crawl_metrics::series(&pool, Bucket::Day, Some(since))
+        .await
+        .unwrap();
+    assert_eq!(got.len(), 1, "only the in-window row");
+}
+
+async fn seed_page(pool: &PgPool) -> Uuid {
+    let manga = Uuid::new_v4();
+    let chapter = Uuid::new_v4();
+    let page = Uuid::new_v4();
+    sqlx::query("INSERT INTO mangas (id, title) VALUES ($1, 'M')")
+        .bind(manga)
+        .execute(pool)
+        .await
+        .unwrap();
+    sqlx::query("INSERT INTO chapters (id, manga_id, number) VALUES ($1, $2, 1)")
+        .bind(chapter)
+        .bind(manga)
+        .execute(pool)
+        .await
+        .unwrap();
+    sqlx::query(
+        "INSERT INTO pages (id, chapter_id, page_number, storage_key, content_type) \
+         VALUES ($1, $2, 1, 'k', 'image/png')",
+    )
+    .bind(page)
+    .bind(chapter)
+    .execute(pool)
+    .await
+    .unwrap();
+    page
+}
+
+async fn insert_analysis(pool: &PgPool, page_id: Uuid, status: &str, dur: i64, analyzed_at: &str) {
+    sqlx::query(
+        "INSERT INTO page_analysis (page_id, status, duration_ms, analyzed_at) \
+         VALUES ($1, $2, $3, $4::timestamptz)",
+    )
+    .bind(page_id)
+    .bind(status)
+    .bind(dur)
+    .bind(analyzed_at)
+    .execute(pool)
+    .await
+    .unwrap();
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn analysis_series_splits_ok_failed_by_bucket(pool: PgPool) {
+    let p1 = seed_page(&pool).await;
+    let p2 = seed_page(&pool).await;
+    let p3 = seed_page(&pool).await;
+    insert_analysis(&pool, p1, "done", 500, "2026-06-18T09:00:00Z").await;
+    insert_analysis(&pool, p2, "failed", 999, "2026-06-18T09:30:00Z").await;
+    insert_analysis(&pool, p3, "done", 700, "2026-06-18T11:00:00Z").await;
+
+    let hourly = page_analysis::analysis_series(&pool, Bucket::Hour, None)
+        .await
+        .unwrap();
+    assert_eq!(hourly.len(), 2);
+    assert_eq!(hourly[0].n, 2);
+    assert_eq!(hourly[0].ok, 1);
+    assert_eq!(hourly[0].failed, 1);
+    // Mean duration is done-only → 500 (the failed 999 is excluded).
+    assert_eq!(hourly[0].avg_ms, Some(500.0));
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn crawler_series_endpoint_shape_and_gating(pool: PgPool) {
+    let h = harness(pool.clone());
+    // Non-admin → 403.
+    let (_u, plain) = register_user(&h.app).await;
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie("/api/v1/admin/crawler/metrics/series", &plain))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::FORBIDDEN);
+
+    let cookie = seed_admin(&pool, &h.app).await;
+    insert_metric(&pool, "ok", 100, "2026-06-18T09:10:00Z").await;
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie(
+            "/api/v1/admin/crawler/metrics/series?days=1",
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = body_json(resp).await;
+    assert!(body["buckets"].is_array());
+
+    // Bad bucket → 400.
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie(
+            "/api/v1/admin/crawler/metrics/series?bucket=year",
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn analysis_series_endpoint_ok(pool: PgPool) {
+    let h = harness(pool.clone());
+    let cookie = seed_admin(&pool, &h.app).await;
+    let resp = h
+        .app
+        .oneshot(get_with_cookie(
+            "/api/v1/admin/analysis/metrics/series?days=7",
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = body_json(resp).await;
+    assert!(body["buckets"].is_array());
+}

backend/tests/analysis_worker.rs

@@ -317,6 +317,8 @@ async fn worker_ignores_non_analyze_jobs(pool: PgPool) {
         &JobPayload::SyncManga {
             source_id: "s".into(),
             source_manga_key: "k".into(),
+            url: "https://target.example/manga/k".into(),
+            title: "K".into(),
         },
     )
     .await

backend/tests/api_admin_audit.rs

@@ -0,0 +1,175 @@
+//! Integration tests for the admin audit-log viewer: the `repo::admin_audit`
+//! list query (filters, username join, NULL actor) and the
+//! `GET /v1/admin/audit` endpoint (admin-gating, shape, filter params).
+
+mod common;
+
+use axum::http::StatusCode;
+use axum::Router;
+use serde_json::json;
+use sqlx::PgPool;
+use tower::ServiceExt;
+use uuid::Uuid;
+
+use common::{body_json, get_with_cookie, harness, register_user};
+use mangalord::repo::admin_audit::{self, AuditFilter};
+
+async fn seed_admin(pool: &PgPool, app: &Router) -> (Uuid, String) {
+    let (username, cookie) = register_user(app).await;
+    let u = mangalord::repo::user::find_by_username(pool, &username)
+        .await
+        .unwrap()
+        .unwrap();
+    mangalord::repo::user::set_is_admin_unchecked(pool, u.id, true)
+        .await
+        .unwrap();
+    (u.id, cookie)
+}
+
+/// Insert an audit row with an explicit `at` so ordering/since are testable.
+async fn insert_audit(
+    pool: &PgPool,
+    actor: Option<Uuid>,
+    action: &str,
+    target_kind: &str,
+    at: &str,
+) {
+    sqlx::query(
+        "INSERT INTO admin_audit (actor_user_id, action, target_kind, target_id, payload, at) \
+         VALUES ($1, $2, $3, NULL, $4, $5::timestamptz)",
+    )
+    .bind(actor)
+    .bind(action)
+    .bind(target_kind)
+    .bind(json!({ "k": action }))
+    .bind(at)
+    .execute(pool)
+    .await
+    .unwrap();
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_joins_username_and_orders_newest_first(pool: PgPool) {
+    let h = harness(pool.clone());
+    let (admin_id, _cookie) = seed_admin(&pool, &h.app).await;
+    insert_audit(&pool, Some(admin_id), "crawler_run", "crawler", "2026-06-01T00:00:00Z").await;
+    insert_audit(&pool, None, "manga_resync", "manga", "2026-06-02T00:00:00Z").await;
+
+    let (items, total) = admin_audit::list(&pool, AuditFilter::default(), 50, 0)
+        .await
+        .unwrap();
+    assert_eq!(total, 2);
+    // Newest first.
+    assert_eq!(items[0].action, "manga_resync");
+    assert_eq!(items[1].action, "crawler_run");
+    // Username join: the admin actor resolves; the NULL actor stays None.
+    assert_eq!(items[1].actor_user_id, Some(admin_id));
+    assert!(items[1].actor_username.is_some());
+    assert_eq!(items[0].actor_user_id, None);
+    assert_eq!(items[0].actor_username, None);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn list_filters_by_action_target_kind_actor_and_since(pool: PgPool) {
+    let h = harness(pool.clone());
+    let (admin_id, _cookie) = seed_admin(&pool, &h.app).await;
+    insert_audit(&pool, Some(admin_id), "crawler_run", "crawler", "2026-05-01T00:00:00Z").await;
+    insert_audit(&pool, Some(admin_id), "manga_resync", "manga", "2026-06-10T00:00:00Z").await;
+    insert_audit(&pool, None, "crawler_run", "crawler", "2026-06-11T00:00:00Z").await;
+
+    // Filter by action.
+    let (items, total) = admin_audit::list(
+        &pool,
+        AuditFilter { action: Some("crawler_run"), ..Default::default() },
+        50,
+        0,
+    )
+    .await
+    .unwrap();
+    assert_eq!(total, 2);
+    assert!(items.iter().all(|r| r.action == "crawler_run"));
+
+    // Filter by target_kind.
+    let (_items, total) = admin_audit::list(
+        &pool,
+        AuditFilter { target_kind: Some("manga"), ..Default::default() },
+        50,
+        0,
+    )
+    .await
+    .unwrap();
+    assert_eq!(total, 1);
+
+    // Filter by actor.
+    let (_items, total) = admin_audit::list(
+        &pool,
+        AuditFilter { actor_user_id: Some(admin_id), ..Default::default() },
+        50,
+        0,
+    )
+    .await
+    .unwrap();
+    assert_eq!(total, 2);
+
+    // Filter by since (only the two June rows).
+    let since = chrono::DateTime::parse_from_rfc3339("2026-06-01T00:00:00Z")
+        .unwrap()
+        .with_timezone(&chrono::Utc);
+    let (_items, total) = admin_audit::list(
+        &pool,
+        AuditFilter { since: Some(since), ..Default::default() },
+        50,
+        0,
+    )
+    .await
+    .unwrap();
+    assert_eq!(total, 2);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn endpoint_requires_admin(pool: PgPool) {
+    let h = harness(pool.clone());
+    let (_u, cookie) = register_user(&h.app).await;
+    let resp = h
+        .app
+        .oneshot(get_with_cookie("/api/v1/admin/audit", &cookie))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::FORBIDDEN);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn endpoint_returns_paged_shape_and_honors_filter(pool: PgPool) {
+    let h = harness(pool.clone());
+    let (admin_id, cookie) = seed_admin(&pool, &h.app).await;
+    insert_audit(&pool, Some(admin_id), "crawler_run", "crawler", "2026-06-01T00:00:00Z").await;
+    insert_audit(&pool, Some(admin_id), "manga_resync", "manga", "2026-06-02T00:00:00Z").await;
+
+    // Unfiltered: both rows + paged envelope.
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie("/api/v1/admin/audit", &cookie))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = body_json(resp).await;
+    assert_eq!(body["page"]["total"], 2);
+    assert_eq!(body["items"].as_array().unwrap().len(), 2);
+    assert!(body["items"][0]["actor_username"].is_string());
+
+    // Filter by action.
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie(
+            "/api/v1/admin/audit?action=manga_resync",
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    let body = body_json(resp).await;
+    assert_eq!(body["page"]["total"], 1);
+    assert_eq!(body["items"][0]["action"], "manga_resync");
+    assert_eq!(body["items"][0]["target_kind"], "manga");
+}

backend/tests/api_admin_crawler.rs

@@ -206,6 +206,7 @@ async fn control_endpoints_return_503_when_daemon_disabled(pool: PgPool) {
     let cookie = seed_admin(&pool, &h.app).await;
     for uri in [
         "/api/v1/admin/crawler/run",
+        "/api/v1/admin/crawler/reconcile",
         "/api/v1/admin/crawler/browser/restart",
         "/api/v1/admin/crawler/session/clear-expired",
     ] {
@@ -779,6 +780,45 @@ async fn job_history_lists_filters_and_paginates(pool: PgPool) {
     assert_eq!(resp.status(), StatusCode::FORBIDDEN);
 }
 
+#[sqlx::test(migrations = "./migrations")]
+async fn job_history_surfaces_sync_manga_payload_title(pool: PgPool) {
+    // A reconcile-enqueued sync_manga job that died has no manga row, so the
+    // history row must fall back to the payload title/url and be searchable.
+    sqlx::query("INSERT INTO crawler_jobs (id, payload, state, last_error) VALUES ($1, $2, 'dead', 'broken-page body signature')")
+        .bind(Uuid::new_v4())
+        .bind(json!({
+            "kind": "sync_manga",
+            "source_id": "target",
+            "source_manga_key": "gone-1",
+            "url": "http://x/manga/gone-1",
+            "title": "Ghost Manga",
+        }))
+        .execute(&pool)
+        .await
+        .unwrap();
+    let h = harness(pool.clone());
+    let cookie = seed_admin(&pool, &h.app).await;
+
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie(
+            "/api/v1/admin/crawler/history?search=ghost",
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = body_json(resp).await;
+    assert_eq!(body["page"]["total"], 1);
+    let row = &body["items"][0];
+    assert_eq!(row["kind"], "sync_manga");
+    assert_eq!(row["manga_title"], serde_json::Value::Null);
+    assert_eq!(row["payload_title"], "Ghost Manga");
+    assert_eq!(row["source_url"], "http://x/manga/gone-1");
+    assert_eq!(row["source_key"], "gone-1");
+}
+
 // ---------------------------------------------------------------------------
 // Operation metrics: durations, averages, recent-ops log.
 // ---------------------------------------------------------------------------

backend/tests/api_admin_health.rs

@@ -0,0 +1,207 @@
+//! Integration tests for the admin health endpoints: `GET /v1/admin/health`
+//! (shape, admin-gating, default checks present without a daemon) and
+//! `PUT /v1/admin/health/thresholds` (validation, persistence, audit row).
+
+mod common;
+
+use axum::http::StatusCode;
+use axum::Router;
+use serde_json::json;
+use sqlx::PgPool;
+use tower::ServiceExt;
+
+use common::{body_json, get_with_cookie, harness, register_user};
+
+async fn seed_admin(pool: &PgPool, app: &Router) -> String {
+    let (username, cookie) = register_user(app).await;
+    let u = mangalord::repo::user::find_by_username(pool, &username)
+        .await
+        .unwrap()
+        .unwrap();
+    mangalord::repo::user::set_is_admin_unchecked(pool, u.id, true)
+        .await
+        .unwrap();
+    cookie
+}
+
+/// PUT helper (the common module exposes POST helpers; build a PUT here).
+fn put_json_with_cookie(uri: &str, body: serde_json::Value, cookie: &str) -> axum::http::Request<axum::body::Body> {
+    axum::http::Request::builder()
+        .method("PUT")
+        .uri(uri)
+        .header(axum::http::header::COOKIE, cookie)
+        .header(axum::http::header::CONTENT_TYPE, "application/json")
+        .body(axum::body::Body::from(body.to_string()))
+        .unwrap()
+}
+
+fn valid_thresholds() -> serde_json::Value {
+    json!({
+        "disk_pct": 85.0,
+        "mem_pct": 80.0,
+        "dead_jobs_max": 50,
+        "crawl_fail_pct": 25.0,
+        "analysis_fail_pct": 30.0,
+        "cron_freshness_hours": 12,
+        "missing_covers_max": 200
+    })
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn requires_admin(pool: PgPool) {
+    let h = harness(pool.clone());
+    let (_u, cookie) = register_user(&h.app).await;
+    let resp = h
+        .app
+        .oneshot(get_with_cookie("/api/v1/admin/health", &cookie))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::FORBIDDEN);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn report_has_status_checks_and_default_thresholds(pool: PgPool) {
+    let h = harness(pool.clone());
+    let cookie = seed_admin(&pool, &h.app).await;
+    let resp = h
+        .app
+        .oneshot(get_with_cookie("/api/v1/admin/health", &cookie))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = body_json(resp).await;
+    // Overall status + a non-empty checks array (memory / dead_jobs /
+    // missing_covers / fail-rates are always present, daemon or not).
+    assert!(body["status"].is_string());
+    let checks = body["checks"].as_array().unwrap();
+    assert!(!checks.is_empty());
+    let ids: Vec<&str> = checks.iter().map(|c| c["id"].as_str().unwrap()).collect();
+    assert!(ids.contains(&"memory"));
+    assert!(ids.contains(&"dead_jobs"));
+    assert!(ids.contains(&"crawl_fail_rate"));
+    // The harness wires no crawler daemon, so session/browser checks are absent.
+    assert!(!ids.contains(&"crawler_session"));
+    // Default thresholds echoed back.
+    assert_eq!(body["thresholds"]["dead_jobs_max"], 100);
+    assert_eq!(body["thresholds"]["disk_pct"], 90.0);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn dead_jobs_check_warns_when_over_threshold(pool: PgPool) {
+    let h = harness(pool.clone());
+    let cookie = seed_admin(&pool, &h.app).await;
+    // Lower the threshold to 0, then a single dead job trips the check.
+    let mut t = valid_thresholds();
+    t["dead_jobs_max"] = json!(0);
+    let resp = h
+        .app
+        .clone()
+        .oneshot(put_json_with_cookie(
+            "/api/v1/admin/health/thresholds",
+            t,
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+
+    sqlx::query(
+        "INSERT INTO crawler_jobs (payload, state) VALUES ($1, 'dead')",
+    )
+    .bind(json!({ "kind": "sync_manga", "source_id": "target", "source_manga_key": "k", "url": "http://x", "title": "T" }))
+    .execute(&pool)
+    .await
+    .unwrap();
+
+    let resp = h
+        .app
+        .clone()
+        .oneshot(get_with_cookie("/api/v1/admin/health", &cookie))
+        .await
+        .unwrap();
+    let body = body_json(resp).await;
+    let dead = body["checks"]
+        .as_array()
+        .unwrap()
+        .iter()
+        .find(|c| c["id"] == "dead_jobs")
+        .unwrap();
+    assert_eq!(dead["status"], "warn");
+    assert_eq!(body["status"], "warn"); // overall rolls up the worst
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn update_thresholds_persists_and_audits(pool: PgPool) {
+    let h = harness(pool.clone());
+    let cookie = seed_admin(&pool, &h.app).await;
+    let resp = h
+        .app
+        .clone()
+        .oneshot(put_json_with_cookie(
+            "/api/v1/admin/health/thresholds",
+            valid_thresholds(),
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::OK);
+    let body = body_json(resp).await;
+    // Response re-evaluates against the new thresholds.
+    assert_eq!(body["thresholds"]["dead_jobs_max"], 50);
+
+    // Persisted to app_settings.
+    let stored: serde_json::Value =
+        sqlx::query_scalar("SELECT value FROM app_settings WHERE key = 'health_thresholds'")
+            .fetch_one(&pool)
+            .await
+            .unwrap();
+    assert_eq!(stored["mem_pct"], 80.0);
+
+    // Audit row written.
+    let action: String =
+        sqlx::query_scalar("SELECT action FROM admin_audit ORDER BY at DESC LIMIT 1")
+            .fetch_one(&pool)
+            .await
+            .unwrap();
+    assert_eq!(action, "update_health_thresholds");
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn last_metadata_tick_at_reads_crawler_state(pool: PgPool) {
+    // Absent → None.
+    assert!(mangalord::repo::crawler::last_metadata_tick_at(&pool)
+        .await
+        .unwrap()
+        .is_none());
+    // Stored in the daemon's `{"at": rfc3339}` shape → parsed back.
+    sqlx::query(
+        "INSERT INTO crawler_state (key, value) VALUES ('last_metadata_tick_at', $1)",
+    )
+    .bind(json!({ "at": "2026-06-18T09:30:00Z" }))
+    .execute(&pool)
+    .await
+    .unwrap();
+    let got = mangalord::repo::crawler::last_metadata_tick_at(&pool)
+        .await
+        .unwrap()
+        .unwrap();
+    assert_eq!(got.to_rfc3339(), "2026-06-18T09:30:00+00:00");
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn update_thresholds_rejects_out_of_range(pool: PgPool) {
+    let h = harness(pool.clone());
+    let cookie = seed_admin(&pool, &h.app).await;
+    let mut bad = valid_thresholds();
+    bad["disk_pct"] = json!(150.0); // > 100
+    let resp = h
+        .app
+        .oneshot(put_json_with_cookie(
+            "/api/v1/admin/health/thresholds",
+            bad,
+            &cookie,
+        ))
+        .await
+        .unwrap();
+    assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
+}

backend/tests/crawler_daemon.rs

@@ -91,6 +91,18 @@ impl ChapterDispatcher for PanickingDispatcher {
     }
 }
 
+/// Always returns an error — used to drive a job to the dead-letter state.
+struct FailingDispatcher {
+    seen: AtomicUsize,
+}
+#[async_trait::async_trait]
+impl ChapterDispatcher for FailingDispatcher {
+    async fn dispatch(&self, _payload: JobPayload) -> anyhow::Result<SyncOutcome> {
+        self.seen.fetch_add(1, Ordering::AcqRel);
+        anyhow::bail!("simulated detail-page failure")
+    }
+}
+
 /// Never completes — used to verify the worker's outer dispatch timeout.
 struct HangingDispatcher {
     seen: AtomicUsize,
@@ -226,6 +238,79 @@ async fn workers_drain_jobs_through_dispatcher(pool: PgPool) {
     assert_eq!(count_state(&pool, "done").await, 3);
 }
 
+async fn enqueue_sync_manga_job(pool: &PgPool, key: &str) -> Uuid {
+    let res = jobs::enqueue(
+        pool,
+        &JobPayload::SyncManga {
+            source_id: "target".into(),
+            source_manga_key: key.into(),
+            url: format!("http://x/{key}"),
+            title: format!("M {key}"),
+        },
+    )
+    .await
+    .unwrap();
+    match res {
+        jobs::EnqueueResult::Inserted(id) => id,
+        jobs::EnqueueResult::Skipped => unreachable!("fresh key"),
+    }
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn worker_leases_sync_manga_and_failure_dead_letters(pool: PgPool) {
+    // The crawl worker must pick up reconcile-enqueued SyncManga jobs (the
+    // lease_kinds change), and a failure must dead-letter (leave-dead). Set
+    // max_attempts=1 so a single failure is terminal — no waiting through
+    // exponential backoff.
+    let id = enqueue_sync_manga_job(&pool, "missing-1").await;
+    sqlx::query("UPDATE crawler_jobs SET max_attempts = 1 WHERE id = $1")
+        .bind(id)
+        .execute(&pool)
+        .await
+        .unwrap();
+
+    let dispatcher = Arc::new(FailingDispatcher {
+        seen: AtomicUsize::new(0),
+    });
+    let session_expired = Arc::new(std::sync::atomic::AtomicBool::new(false));
+    let cancel = CancellationToken::new();
+    let handle = daemon::spawn(
+        pool.clone(),
+        cancel.clone(),
+        make_cfg(None, dispatcher.clone(), session_expired, 1),
+    );
+
+    for _ in 0..60 {
+        if count_state(&pool, "dead").await >= 1 {
+            break;
+        }
+        tokio::time::sleep(Duration::from_millis(50)).await;
+    }
+    handle.shutdown().await;
+
+    assert!(
+        dispatcher.seen.load(Ordering::Acquire) >= 1,
+        "worker must lease the sync_manga job"
+    );
+    assert_eq!(
+        count_state(&pool, "dead").await,
+        1,
+        "a failed sync_manga job dead-letters (leave-dead)"
+    );
+    let last_error: Option<String> =
+        sqlx::query_scalar("SELECT last_error FROM crawler_jobs WHERE id = $1")
+            .bind(id)
+            .fetch_one(&pool)
+            .await
+            .unwrap();
+    assert!(
+        last_error
+            .unwrap_or_default()
+            .contains("simulated detail-page failure"),
+        "dead job records the failure reason"
+    );
+}
+
 #[sqlx::test(migrations = "./migrations")]
 async fn workers_idle_while_session_expired(pool: PgPool) {
     let id = enqueue_chapter_job(&pool).await;

backend/tests/crawler_dead_jobs.rs

@@ -116,6 +116,57 @@ async fn list_dead_jobs_filters_by_title_search(pool: PgPool) {
     assert_eq!(items[0].manga_title.as_deref(), Some("One Piece"));
 }
 
+/// Insert a dead `sync_manga` job (no manga/chapter rows) — the reconcile
+/// "detail page gone" case.
+async fn insert_dead_sync_manga(pool: &PgPool, key: &str, title: &str) -> Uuid {
+    let id = Uuid::new_v4();
+    let payload = json!({
+        "kind": "sync_manga",
+        "source_id": "target",
+        "source_manga_key": key,
+        "url": format!("http://x/manga/{key}"),
+        "title": title,
+    });
+    sqlx::query(
+        "INSERT INTO crawler_jobs (id, payload, state, attempts, last_error) \
+         VALUES ($1, $2, 'dead', 5, 'broken-page body signature')",
+    )
+    .bind(id)
+    .bind(payload)
+    .execute(pool)
+    .await
+    .unwrap();
+    id
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn dead_sync_manga_job_surfaces_payload_title_and_url(pool: PgPool) {
+    insert_dead_sync_manga(&pool, "gone-1", "Ghost Manga").await;
+
+    let (items, total) = crawler::list_dead_jobs(&pool, None, 50, 0).await.unwrap();
+    assert_eq!(total, 1);
+    let row = &items[0];
+    // No manga row exists → manga_title is None; the payload fields fill in.
+    assert_eq!(row.manga_title, None);
+    assert_eq!(row.payload_title.as_deref(), Some("Ghost Manga"));
+    assert_eq!(row.source_url.as_deref(), Some("http://x/manga/gone-1"));
+    assert_eq!(row.source_key.as_deref(), Some("gone-1"));
+    assert_eq!(row.kind, "sync_manga");
+    assert_eq!(row.last_error.as_deref(), Some("broken-page body signature"));
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn dead_jobs_search_matches_payload_title(pool: PgPool) {
+    insert_dead_sync_manga(&pool, "gone-1", "Ghost Manga").await;
+    insert_dead_sync_manga(&pool, "gone-2", "Other Title").await;
+
+    let (items, total) = crawler::list_dead_jobs(&pool, Some("ghost"), 50, 0)
+        .await
+        .unwrap();
+    assert_eq!(total, 1);
+    assert_eq!(items[0].payload_title.as_deref(), Some("Ghost Manga"));
+}
+
 #[sqlx::test(migrations = "./migrations")]
 async fn requeue_all_resets_dead_jobs_to_pending(pool: PgPool) {
     let (_m, c1) = seed_chapter(&pool, "A", 1).await;

backend/tests/crawler_jobs.rs

@@ -7,7 +7,7 @@
 use std::time::Duration;
 
 use mangalord::crawler::jobs::{
-    self, EnqueueResult, JobPayload, KIND_SYNC_CHAPTER_CONTENT,
+    self, EnqueueResult, JobPayload, KIND_ANALYZE_PAGE, KIND_SYNC_CHAPTER_CONTENT, KIND_SYNC_MANGA,
 };
 use sqlx::PgPool;
 use uuid::Uuid;
@@ -27,6 +27,8 @@ fn sync_manga_payload(key: &str) -> JobPayload {
     JobPayload::SyncManga {
         source_id: "target".into(),
         source_manga_key: key.into(),
+        url: format!("https://target.example/manga/{key}"),
+        title: format!("Manga {key}"),
     }
 }
 
@@ -278,6 +280,60 @@ async fn lease_with_kind_filter_only_matches_that_kind(pool: PgPool) {
     assert_eq!(job_state(&pool, manga_id).await, "pending");
 }
 
+#[sqlx::test(migrations = "./migrations")]
+async fn lease_kinds_matches_listed_kinds_and_excludes_others(pool: PgPool) {
+    // The crawl worker drains both sync_chapter_content and sync_manga, but
+    // never analyze_page (owned by the analysis daemon).
+    let manga_id = match jobs::enqueue(&pool, &sync_manga_payload("foo"))
+        .await
+        .unwrap()
+    {
+        EnqueueResult::Inserted(id) => id,
+        _ => unreachable!(),
+    };
+    let chapter_id = match jobs::enqueue(&pool, &chapter_content_payload(Uuid::new_v4()))
+        .await
+        .unwrap()
+    {
+        EnqueueResult::Inserted(id) => id,
+        _ => unreachable!(),
+    };
+    let analyze_id = match jobs::enqueue(
+        &pool,
+        &JobPayload::AnalyzePage {
+            page_id: Uuid::new_v4(),
+            force: false,
+        },
+    )
+    .await
+    .unwrap()
+    {
+        EnqueueResult::Inserted(id) => id,
+        _ => unreachable!(),
+    };
+
+    let leases = jobs::lease_kinds(
+        &pool,
+        &[KIND_SYNC_CHAPTER_CONTENT, KIND_SYNC_MANGA],
+        10,
+        Duration::from_secs(60),
+    )
+    .await
+    .unwrap();
+    let leased_ids: std::collections::HashSet<Uuid> = leases.iter().map(|l| l.id).collect();
+    assert_eq!(leases.len(), 2, "both crawl kinds lease");
+    assert!(leased_ids.contains(&manga_id));
+    assert!(leased_ids.contains(&chapter_id));
+    // analyze_page stays pending — not in the requested kinds.
+    assert_eq!(job_state(&pool, analyze_id).await, "pending");
+    // Sanity: KIND_ANALYZE_PAGE alone leases only it.
+    let only_analyze = jobs::lease_kinds(&pool, &[KIND_ANALYZE_PAGE], 10, Duration::from_secs(60))
+        .await
+        .unwrap();
+    assert_eq!(only_analyze.len(), 1);
+    assert_eq!(only_analyze[0].id, analyze_id);
+}
+
 #[sqlx::test(migrations = "./migrations")]
 async fn concurrent_leases_under_skip_locked_return_disjoint_ids(pool: PgPool) {
     // 4 pending jobs, two concurrent calls each asking for up to 2.

backend/tests/crawler_reconcile.rs

@@ -0,0 +1,145 @@
+//! Integration tests for the reconcile diff queries:
+//! `existing_source_keys` (dropped rows count as present) and
+//! `sync_manga_keys_with_blocking_job` (pending/running/dead block).
+//!
+//! The browser-driven full walk in `reconcile::reconcile_missing` needs a
+//! real `chromiumoxide::Browser`, so it is covered by the manual/E2E path;
+//! the pure set-diff (`select_missing`) is unit-tested in `crawler::reconcile`.
+
+use mangalord::crawler::jobs::{self, JobPayload};
+use mangalord::repo::crawler;
+use sqlx::PgPool;
+use uuid::Uuid;
+
+async fn ensure_target(pool: &PgPool) {
+    sqlx::query(
+        "INSERT INTO sources (id, name, base_url) VALUES ('target','T','http://x') \
+         ON CONFLICT DO NOTHING",
+    )
+    .execute(pool)
+    .await
+    .unwrap();
+}
+
+/// Insert a `manga_sources` row (with its backing manga) under `target`.
+async fn seed_source_manga(pool: &PgPool, key: &str, dropped: bool) {
+    let manga_id = Uuid::new_v4();
+    sqlx::query("INSERT INTO mangas (id, title) VALUES ($1, $2)")
+        .bind(manga_id)
+        .bind(format!("M {key}"))
+        .execute(pool)
+        .await
+        .unwrap();
+    sqlx::query(
+        "INSERT INTO manga_sources (source_id, source_manga_key, manga_id, source_url, dropped_at) \
+         VALUES ('target', $1, $2, $3, CASE WHEN $4 THEN now() ELSE NULL END)",
+    )
+    .bind(key)
+    .bind(manga_id)
+    .bind(format!("http://x/{key}"))
+    .bind(dropped)
+    .execute(pool)
+    .await
+    .unwrap();
+}
+
+async fn enqueue_sync_manga(pool: &PgPool, key: &str) -> Uuid {
+    let res = jobs::enqueue(
+        pool,
+        &JobPayload::SyncManga {
+            source_id: "target".into(),
+            source_manga_key: key.into(),
+            url: format!("http://x/{key}"),
+            title: format!("M {key}"),
+        },
+    )
+    .await
+    .unwrap();
+    match res {
+        jobs::EnqueueResult::Inserted(id) => id,
+        jobs::EnqueueResult::Skipped => panic!("expected insert"),
+    }
+}
+
+async fn set_job_state(pool: &PgPool, id: Uuid, state: &str) {
+    sqlx::query("UPDATE crawler_jobs SET state = $2::text WHERE id = $1")
+        .bind(id)
+        .bind(state)
+        .execute(pool)
+        .await
+        .unwrap();
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn existing_source_keys_includes_dropped_rows(pool: PgPool) {
+    ensure_target(&pool).await;
+    seed_source_manga(&pool, "live", false).await;
+    seed_source_manga(&pool, "dropped", true).await;
+
+    let keys = crawler::existing_source_keys(&pool, "target").await.unwrap();
+    assert!(keys.contains("live"));
+    assert!(
+        keys.contains("dropped"),
+        "a dropped manga_sources row must still count as present"
+    );
+    assert_eq!(keys.len(), 2);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn sync_manga_blocking_job_matches_pending_running_dead_only(pool: PgPool) {
+    ensure_target(&pool).await;
+    // One key per state.
+    enqueue_sync_manga(&pool, "pending").await; // stays pending
+    let running = enqueue_sync_manga(&pool, "running").await;
+    let dead = enqueue_sync_manga(&pool, "dead").await;
+    let done = enqueue_sync_manga(&pool, "done").await;
+    let failed = enqueue_sync_manga(&pool, "failed").await;
+    set_job_state(&pool, running, "running").await;
+    set_job_state(&pool, dead, "dead").await;
+    set_job_state(&pool, done, "done").await;
+    set_job_state(&pool, failed, "failed").await;
+
+    let blocked = crawler::sync_manga_keys_with_blocking_job(&pool, "target")
+        .await
+        .unwrap();
+    assert!(blocked.contains("pending"));
+    assert!(blocked.contains("running"));
+    assert!(blocked.contains("dead"));
+    assert!(!blocked.contains("done"), "done must not block re-enqueue");
+    assert!(
+        !blocked.contains("failed"),
+        "failed (mid-backoff) must not block re-enqueue"
+    );
+    assert_eq!(blocked.len(), 3);
+}
+
+#[sqlx::test(migrations = "./migrations")]
+async fn sync_manga_blocking_job_is_per_source(pool: PgPool) {
+    ensure_target(&pool).await;
+    sqlx::query(
+        "INSERT INTO sources (id, name, base_url) VALUES ('other','O','http://y') \
+         ON CONFLICT DO NOTHING",
+    )
+    .execute(&pool)
+    .await
+    .unwrap();
+    enqueue_sync_manga(&pool, "shared").await;
+    jobs::enqueue(
+        &pool,
+        &JobPayload::SyncManga {
+            source_id: "other".into(),
+            source_manga_key: "elsewhere".into(),
+            url: "http://y/elsewhere".into(),
+            title: "Elsewhere".into(),
+        },
+    )
+    .await
+    .unwrap();
+
+    let blocked = crawler::sync_manga_keys_with_blocking_job(&pool, "target")
+        .await
+        .unwrap();
+    assert!(blocked.contains("shared"));
+    assert!(!blocked.contains("elsewhere"));
+    assert_eq!(blocked.len(), 1);
+}

frontend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "mangalord-frontend",
-  "version": "0.85.1",
+  "version": "0.87.0",
   "private": true,
   "type": "module",
   "scripts": {

frontend/src/lib/admin/series.test.ts

@@ -0,0 +1,51 @@
+import { describe, it, expect } from 'vitest';
+import { buildSeries, unitForDays, truncUtc } from './series';
+import type { MetricsBucket } from '$lib/api/admin';
+
+function bucket(t: string, n: number, ok: number, avg: number | null): MetricsBucket {
+    return { t, n, ok, failed: n - ok, avg_ms: avg };
+}
+
+describe('series helpers', () => {
+    it('picks hour vs day by window', () => {
+        expect(unitForDays(1)).toBe('hour');
+        expect(unitForDays(2)).toBe('hour');
+        expect(unitForDays(7)).toBe('day');
+        expect(unitForDays(0)).toBe('day');
+    });
+
+    it('truncUtc snaps to hour/day boundaries', () => {
+        const ms = Date.parse('2026-06-18T09:37:42Z');
+        expect(new Date(truncUtc(ms, 'hour')).toISOString()).toBe('2026-06-18T09:00:00.000Z');
+        expect(new Date(truncUtc(ms, 'day')).toISOString()).toBe('2026-06-18T00:00:00.000Z');
+    });
+
+    it('fills empty buckets: throughput 0, success/duration null', () => {
+        // days=2 → hourly. Provide data only at 10:00; 11:00 must be a gap.
+        const now = Date.parse('2026-06-18T11:30:00Z');
+        const buckets = [bucket('2026-06-18T10:00:00Z', 4, 3, 200)];
+        const s = buildSeries(buckets, 2, now);
+        // Find the 10:00 and 11:00 slots.
+        const at10 = s.throughput.findIndex((p) => p.t === '2026-06-18T10:00:00.000Z');
+        expect(at10).toBeGreaterThanOrEqual(0);
+        expect(s.throughput[at10].value).toBe(4);
+        expect(s.success[at10].value).toBe(75); // 3/4
+        expect(s.duration[at10].value).toBe(200);
+
+        const at11 = s.throughput.findIndex((p) => p.t === '2026-06-18T11:00:00.000Z');
+        expect(s.throughput[at11].value).toBe(0); // no ops → zero throughput
+        expect(s.success[at11].value).toBeNull(); // no denominator → gap
+        expect(s.duration[at11].value).toBeNull();
+    });
+
+    it('all-time spans only the data present', () => {
+        const buckets = [
+            bucket('2026-06-10T00:00:00Z', 1, 1, 100),
+            bucket('2026-06-12T00:00:00Z', 1, 0, 100)
+        ];
+        const s = buildSeries(buckets, 0);
+        // 10th, 11th (gap), 12th → 3 day slots.
+        expect(s.throughput.length).toBe(3);
+        expect(s.throughput[1].value).toBe(0);
+    });
+});

frontend/src/lib/admin/series.ts

@@ -0,0 +1,75 @@
+// Turn the backend's sparse, ordered metric buckets into the three
+// continuous point series the trend charts render. Empty intervals become
+// explicit points so the chart shows real gaps rather than interpolating
+// across missing time: throughput is 0 (no ops happened), while success-rate
+// and duration are null (no denominator / no samples) and render as a gap.
+
+import type { MetricsBucket } from '$lib/api/admin';
+
+export type SeriesPoint = { t: string; value: number | null };
+
+export type TrendSeries = {
+    throughput: SeriesPoint[];
+    success: SeriesPoint[];
+    duration: SeriesPoint[];
+};
+
+/** Bucket unit the backend uses for a given window (kept in lockstep with
+ *  `resolve_bucket` on the server: short windows → hour, else day). */
+export function unitForDays(days: number): 'hour' | 'day' {
+    return days > 0 && days <= 2 ? 'hour' : 'day';
+}
+
+function stepMs(unit: 'hour' | 'day'): number {
+    return unit === 'hour' ? 3_600_000 : 86_400_000;
+}
+
+/** Truncate a UTC timestamp to the start of its hour/day, matching Postgres
+ *  `date_trunc` (which the bucket `t` values already are). */
+export function truncUtc(ms: number, unit: 'hour' | 'day'): number {
+    const d = new Date(ms);
+    if (unit === 'hour') {
+        d.setUTCMinutes(0, 0, 0);
+    } else {
+        d.setUTCHours(0, 0, 0, 0);
+    }
+    return d.getTime();
+}
+
+export function buildSeries(
+    buckets: MetricsBucket[],
+    days: number,
+    now: number = Date.now()
+): TrendSeries {
+    const unit = unitForDays(days);
+    const step = stepMs(unit);
+    const byT = new Map<number, MetricsBucket>();
+    for (const b of buckets) byT.set(truncUtc(new Date(b.t).getTime(), unit), b);
+
+    let startMs: number;
+    let endMs: number;
+    if (days > 0) {
+        endMs = truncUtc(now, unit);
+        startMs = truncUtc(now - days * 86_400_000, unit);
+    } else {
+        // All-time: span only the data we have.
+        if (buckets.length === 0) return { throughput: [], success: [], duration: [] };
+        const times = buckets.map((b) => truncUtc(new Date(b.t).getTime(), unit));
+        startMs = Math.min(...times);
+        endMs = Math.max(...times);
+    }
+
+    const throughput: SeriesPoint[] = [];
+    const success: SeriesPoint[] = [];
+    const duration: SeriesPoint[] = [];
+    // Guard against an absurd point count (defensive; backend caps days at 365).
+    let guard = 0;
+    for (let t = startMs; t <= endMs && guard < 5000; t += step, guard++) {
+        const b = byT.get(t);
+        const iso = new Date(t).toISOString();
+        throughput.push({ t: iso, value: b ? b.n : 0 });
+        success.push({ t: iso, value: b && b.n > 0 ? (b.ok / b.n) * 100 : null });
+        duration.push({ t: iso, value: b && b.avg_ms != null ? b.avg_ms : null });
+    }
+    return { throughput, success, duration };
+}

frontend/src/lib/api/admin.test.ts

@@ -23,6 +23,7 @@ import {
     getCrawlerStatus,
     crawlerStatusStreamUrl,
     runCrawlerPass,
+    reconcileCrawler,
     restartCrawlerBrowser,
     updateCrawlerSession,
     clearCrawlerSessionExpired,
@@ -41,7 +42,12 @@ import {
     listAnalysisHistory,
     getCrawlerMetrics,
     listCrawlerOps,
-    getAnalysisMetrics
+    getAnalysisMetrics,
+    listAuditLog,
+    getHealth,
+    updateHealthThresholds,
+    getCrawlerMetricsSeries,
+    getAnalysisMetricsSeries
 } from './admin';
 
 function ok(body: unknown, status = 200): Response {
@@ -470,6 +476,96 @@ describe('admin crawler api client', () => {
         expect(fetchSpy.mock.calls[0][0]).toMatch(/\/v1\/admin\/crawler\/covers$/);
     });
 
+    it('listAuditLog GETs /v1/admin/audit with the paged envelope', async () => {
+        fetchSpy.mockResolvedValueOnce(
+            ok({
+                items: [
+                    {
+                        id: 'a-1',
+                        actor_user_id: 'u-1',
+                        actor_username: 'alice',
+                        action: 'crawler_run',
+                        target_kind: 'crawler',
+                        target_id: null,
+                        payload: {},
+                        at: '2026-06-01T00:00:00Z'
+                    }
+                ],
+                page: { limit: 25, offset: 0, total: 1 }
+            })
+        );
+        const r = await listAuditLog({ limit: 25 });
+        expect(r.items[0].action).toBe('crawler_run');
+        expect(fetchSpy.mock.calls[0][0]).toMatch(/\/v1\/admin\/audit\?limit=25$/);
+    });
+
+    it('listAuditLog forwards action / target_kind / days filters', async () => {
+        fetchSpy.mockResolvedValueOnce(
+            ok({ items: [], page: { limit: 25, offset: 0, total: 0 } })
+        );
+        await listAuditLog({ action: 'manga_resync', targetKind: 'manga', days: 7 });
+        const url = fetchSpy.mock.calls[0][0] as string;
+        expect(url).toContain('action=manga_resync');
+        expect(url).toContain('target_kind=manga');
+        expect(url).toContain('days=7');
+    });
+
+    const healthFixture = {
+        status: 'ok' as const,
+        checks: [
+            {
+                id: 'memory',
+                label: 'Memory usage',
+                status: 'ok' as const,
+                value: '48%',
+                threshold: '90%',
+                hint: null,
+                action_href: null
+            }
+        ],
+        thresholds: {
+            disk_pct: 90,
+            mem_pct: 90,
+            dead_jobs_max: 100,
+            crawl_fail_pct: 20,
+            analysis_fail_pct: 20,
+            cron_freshness_hours: 26,
+            missing_covers_max: 500
+        }
+    };
+
+    it('getCrawlerMetricsSeries GETs the crawler series with days', async () => {
+        fetchSpy.mockResolvedValueOnce(ok({ buckets: [] }));
+        await getCrawlerMetricsSeries(7);
+        const url = fetchSpy.mock.calls[0][0] as string;
+        expect(url).toMatch(/\/v1\/admin\/crawler\/metrics\/series\?days=7$/);
+    });
+
+    it('getAnalysisMetricsSeries omits days=0 (all-time)', async () => {
+        fetchSpy.mockResolvedValueOnce(ok({ buckets: [] }));
+        await getAnalysisMetricsSeries(0);
+        const url = fetchSpy.mock.calls[0][0] as string;
+        expect(url).toMatch(/\/v1\/admin\/analysis\/metrics\/series$/);
+    });
+
+    it('getHealth GETs /v1/admin/health', async () => {
+        fetchSpy.mockResolvedValueOnce(ok(healthFixture));
+        const r = await getHealth();
+        expect(r.status).toBe('ok');
+        expect(r.checks[0].id).toBe('memory');
+        expect(fetchSpy.mock.calls[0][0]).toMatch(/\/v1\/admin\/health$/);
+    });
+
+    it('updateHealthThresholds PUTs the thresholds body', async () => {
+        fetchSpy.mockResolvedValueOnce(ok(healthFixture));
+        await updateHealthThresholds(healthFixture.thresholds);
+        const url = fetchSpy.mock.calls[0][0] as string;
+        expect(url).toMatch(/\/v1\/admin\/health\/thresholds$/);
+        const init = fetchSpy.mock.calls[0][1] as RequestInit;
+        expect(init.method).toBe('PUT');
+        expect(JSON.parse(init.body as string).dead_jobs_max).toBe(100);
+    });
+
     it('runCrawlerPass POSTs /v1/admin/crawler/run', async () => {
         fetchSpy.mockResolvedValueOnce(ok({ started: true }));
         const r = await runCrawlerPass();
@@ -479,6 +575,15 @@ describe('admin crawler api client', () => {
         expect(fetchSpy.mock.calls[0][0]).toMatch(/\/v1\/admin\/crawler\/run$/);
     });
 
+    it('reconcileCrawler POSTs /v1/admin/crawler/reconcile', async () => {
+        fetchSpy.mockResolvedValueOnce(ok({ started: true }));
+        const r = await reconcileCrawler();
+        expect(r.started).toBe(true);
+        const init = fetchSpy.mock.calls[0][1] as RequestInit;
+        expect(init.method).toBe('POST');
+        expect(fetchSpy.mock.calls[0][0]).toMatch(/\/v1\/admin\/crawler\/reconcile$/);
+    });
+
     it('restartCrawlerBrowser POSTs the restart endpoint', async () => {
         fetchSpy.mockResolvedValueOnce(ok({ ok: true, error: null }));
         const r = await restartCrawlerBrowser();

frontend/src/lib/api/admin.ts

@@ -332,7 +332,8 @@ export type CrawlerPhase =
     | { state: 'idle'; next_fire: string | null }
     | { state: 'walking_list' }
     | { state: 'fetching_metadata'; index: number; total: number | null; title: string }
-    | { state: 'cover_backfill'; index: number; total: number };
+    | { state: 'cover_backfill'; index: number; total: number }
+    | { state: 'reconciling'; walked: number; enqueued: number };
 
 /** A chapter being crawled right now, with a live page count. */
 export type ActiveChapter = {
@@ -382,6 +383,12 @@ export async function runCrawlerPass(): Promise<{ started: boolean }> {
     return request('/v1/admin/crawler/run', { method: 'POST' });
 }
 
+/** POST /v1/admin/crawler/reconcile — full list-only walk that enqueues
+ *  mangas missing from the DB as sync_manga jobs. */
+export async function reconcileCrawler(): Promise<{ started: boolean }> {
+    return request('/v1/admin/crawler/reconcile', { method: 'POST' });
+}
+
 /** POST /v1/admin/crawler/browser/restart — coordinated Chromium restart. */
 export async function restartCrawlerBrowser(): Promise<{ ok: boolean; error: string | null }> {
     return request('/v1/admin/crawler/browser/restart', { method: 'POST' });
@@ -410,6 +417,12 @@ export type DeadJob = {
     manga_id: string | null;
     manga_title: string | null;
     chapter_number: number | null;
+    /** Payload title (fallback label for sync_manga jobs with no manga row). */
+    payload_title: string | null;
+    /** Source detail URL from the payload (sync_manga). */
+    source_url: string | null;
+    /** Source-native key from the payload (sync_manga). */
+    source_key: string | null;
     attempts: number;
     max_attempts: number;
     last_error: string | null;
@@ -513,6 +526,10 @@ export type CrawlerHistoryRow = {
     chapter_number: number | null;
     page_number: number | null;
     source_key: string | null;
+    /** Payload title (fallback label for sync_manga jobs with no manga row). */
+    payload_title: string | null;
+    /** Source detail URL from the payload (sync_manga). */
+    source_url: string | null;
     attempts: number;
     max_attempts: number;
     last_error: string | null;
@@ -961,3 +978,120 @@ export async function updateAnalysisSettings(
         body: JSON.stringify(settings)
     });
 }
+
+// ---- admin audit log -------------------------------------------------------
+
+export type AuditEntry = {
+    id: string;
+    actor_user_id: string | null;
+    /** Actor's current username; null when the account was deleted. */
+    actor_username: string | null;
+    action: string;
+    target_kind: string;
+    target_id: string | null;
+    payload: unknown;
+    at: string;
+};
+
+export type AuditPage = { items: AuditEntry[]; page: Page };
+
+export type ListAuditOptions = {
+    action?: string;
+    targetKind?: string;
+    actorUserId?: string;
+    days?: number;
+    limit?: number;
+    offset?: number;
+};
+
+export async function listAuditLog(
+    opts: ListAuditOptions = {},
+    init?: RequestInit
+): Promise<AuditPage> {
+    const params = new URLSearchParams();
+    if (opts.action) params.set('action', opts.action);
+    if (opts.targetKind) params.set('target_kind', opts.targetKind);
+    if (opts.actorUserId) params.set('actor_user_id', opts.actorUserId);
+    if (opts.days != null && opts.days > 0) params.set('days', String(opts.days));
+    if (opts.limit != null) params.set('limit', String(opts.limit));
+    if (opts.offset != null) params.set('offset', String(opts.offset));
+    const qs = params.toString();
+    return request<AuditPage>(`/v1/admin/audit${qs ? `?${qs}` : ''}`, init);
+}
+
+// ---- operational health checks ---------------------------------------------
+
+export type CheckStatus = 'ok' | 'warn' | 'critical';
+
+export type HealthCheck = {
+    id: string;
+    label: string;
+    status: CheckStatus;
+    value: string;
+    threshold: string | null;
+    hint: string | null;
+    /** Admin route that remediates this check, when one applies. */
+    action_href: string | null;
+};
+
+export type HealthThresholds = {
+    disk_pct: number;
+    mem_pct: number;
+    dead_jobs_max: number;
+    crawl_fail_pct: number;
+    analysis_fail_pct: number;
+    cron_freshness_hours: number;
+    missing_covers_max: number;
+};
+
+export type HealthReport = {
+    status: CheckStatus;
+    checks: HealthCheck[];
+    thresholds: HealthThresholds;
+};
+
+export async function getHealth(init?: RequestInit): Promise<HealthReport> {
+    return request<HealthReport>('/v1/admin/health', init);
+}
+
+export async function updateHealthThresholds(t: HealthThresholds): Promise<HealthReport> {
+    return request<HealthReport>('/v1/admin/health/thresholds', {
+        method: 'PUT',
+        headers: { 'content-type': 'application/json' },
+        body: JSON.stringify(t)
+    });
+}
+
+// ---- metrics trend series (crawler + analysis charts) ----------------------
+
+export type MetricsBucket = {
+    /** Bucket start (ISO timestamp). */
+    t: string;
+    n: number;
+    ok: number;
+    failed: number;
+    avg_ms: number | null;
+};
+
+export type MetricsSeries = { buckets: MetricsBucket[] };
+
+function seriesQs(days: number): string {
+    const params = new URLSearchParams();
+    if (days > 0) params.set('days', String(days));
+    const qs = params.toString();
+    return qs ? `?${qs}` : '';
+}
+
+export async function getCrawlerMetricsSeries(
+    days = 7,
+    init?: RequestInit
+): Promise<MetricsSeries> {
+    return request<MetricsSeries>(`/v1/admin/crawler/metrics/series${seriesQs(days)}`, init);
+}
+
+export async function getAnalysisMetricsSeries(
+    days = 7,
+    init?: RequestInit
+): Promise<MetricsSeries> {
+    return request<MetricsSeries>(`/v1/admin/analysis/metrics/series${seriesQs(days)}`, init);
+}

frontend/src/lib/components/admin/AuditTable.svelte

@@ -0,0 +1,259 @@
+<script lang="ts">
+    import { onMount } from 'svelte';
+    import Pager from '$lib/components/Pager.svelte';
+    import { fmtAgo } from '$lib/format';
+    import { listAuditLog, type AuditEntry } from '$lib/api/admin';
+
+    const LIMIT = 25;
+
+    let rows = $state<AuditEntry[]>([]);
+    let total = $state(0);
+    let page = $state(1);
+    let targetKind = $state('');
+    let action = $state('');
+    let days = $state(0);
+    let loading = $state(true);
+    let error = $state<string | null>(null);
+    let expanded = $state<string | null>(null);
+    // Cancels the in-flight request when a newer one starts, so a slow
+    // response can't overwrite a fresher one (out-of-order races).
+    let inflight: AbortController | null = null;
+
+    const totalPages = $derived(Math.max(1, Math.ceil(total / LIMIT)));
+
+    async function load() {
+        inflight?.abort();
+        const ctrl = new AbortController();
+        inflight = ctrl;
+        loading = true;
+        error = null;
+        try {
+            const resp = await listAuditLog(
+                {
+                    targetKind: targetKind || undefined,
+                    action: action || undefined,
+                    days: days || undefined,
+                    limit: LIMIT,
+                    offset: (page - 1) * LIMIT
+                },
+                { signal: ctrl.signal }
+            );
+            rows = resp.items;
+            total = resp.page.total ?? resp.items.length;
+        } catch (e) {
+            if ((e as Error)?.name === 'AbortError') return; // superseded
+            error = e instanceof Error ? e.message : 'Failed to load audit log.';
+        } finally {
+            if (inflight === ctrl) loading = false;
+        }
+    }
+
+    onMount(load);
+
+    function applyFilters() {
+        page = 1;
+        load();
+    }
+    function onPageChange(p: number) {
+        page = p;
+        load();
+    }
+
+    function actor(r: AuditEntry): string {
+        if (r.actor_username) return r.actor_username;
+        if (r.actor_user_id) return '(deleted user)';
+        return 'system';
+    }
+    function targetLabel(r: AuditEntry): string {
+        if (r.target_id) return `${r.target_kind} · ${r.target_id.slice(0, 8)}`;
+        return r.target_kind;
+    }
+    function pretty(payload: unknown): string {
+        try {
+            return JSON.stringify(payload, null, 2);
+        } catch {
+            return String(payload);
+        }
+    }
+
+    // Closed vocab of target kinds; `action` is a free-text exact filter
+    // (the action set grows over time, so a text box stays future-proof).
+    const TARGET_KINDS = ['', 'crawler', 'manga', 'chapter', 'page', 'settings', 'user'];
+    const WINDOWS: { value: number; label: string }[] = [
+        { value: 0, label: 'All time' },
+        { value: 1, label: 'Last 24h' },
+        { value: 7, label: 'Last 7d' },
+        { value: 30, label: 'Last 30d' }
+    ];
+</script>
+
+<section class="audit" data-testid="audit-table">
+    <div class="toolbar">
+        <select
+            bind:value={targetKind}
+            onchange={applyFilters}
+            aria-label="Filter by target kind"
+            data-testid="audit-target-kind"
+        >
+            {#each TARGET_KINDS as k (k)}
+                <option value={k}>{k === '' ? 'All targets' : k}</option>
+            {/each}
+        </select>
+        <select
+            bind:value={days}
+            onchange={applyFilters}
+            aria-label="Time window"
+            data-testid="audit-window"
+        >
+            {#each WINDOWS as w (w.value)}<option value={w.value}>{w.label}</option>{/each}
+        </select>
+        <input
+            class="action-filter"
+            type="search"
+            placeholder="Filter by action (exact)…"
+            bind:value={action}
+            onchange={applyFilters}
+            aria-label="Filter by action"
+            data-testid="audit-action"
+        />
+    </div>
+
+    {#if error}
+        <p class="error" role="alert">{error}</p>
+    {/if}
+
+    {#if loading}
+        <p class="muted" data-testid="audit-loading">Loading…</p>
+    {:else if rows.length === 0}
+        <p class="muted" data-testid="audit-empty">No audit entries match.</p>
+    {:else}
+        <table>
+            <thead>
+                <tr>
+                    <th>When</th>
+                    <th>Actor</th>
+                    <th>Action</th>
+                    <th>Target</th>
+                    <th class="actions"></th>
+                </tr>
+            </thead>
+            <tbody>
+                {#each rows as r (r.id)}
+                    <tr
+                        class="clickable"
+                        onclick={() => (expanded = expanded === r.id ? null : r.id)}
+                        data-testid={`audit-row-${r.id}`}
+                    >
+                        <td title={new Date(r.at).toLocaleString()}>{fmtAgo(r.at)}</td>
+                        <td>{actor(r)}</td>
+                        <td><span class="action">{r.action}</span></td>
+                        <td class="target">{targetLabel(r)}</td>
+                        <td class="actions">
+                            <!-- Real button so the payload toggle is keyboard-
+                                 reachable; the row onclick is a mouse convenience. -->
+                            <button
+                                type="button"
+                                class="chev"
+                                aria-expanded={expanded === r.id}
+                                aria-label={expanded === r.id ? 'Collapse payload' : 'Expand payload'}
+                                onclick={(e) => {
+                                    e.stopPropagation();
+                                    expanded = expanded === r.id ? null : r.id;
+                                }}
+                            >
+                                {expanded === r.id ? '▾' : '▸'}
+                            </button>
+                        </td>
+                    </tr>
+                    {#if expanded === r.id}
+                        <tr class="payrow">
+                            <td colspan="5"><pre>{pretty(r.payload)}</pre></td>
+                        </tr>
+                    {/if}
+                {/each}
+            </tbody>
+        </table>
+        <Pager {page} {totalPages} onChange={onPageChange} testid="audit-pager" />
+    {/if}
+</section>
+
+<style>
+    .toolbar {
+        display: flex;
+        flex-wrap: wrap;
+        align-items: center;
+        gap: var(--space-2);
+        margin-bottom: var(--space-3);
+    }
+    select,
+    .action-filter {
+        height: 36px;
+        padding: 0 var(--space-2);
+        border: 1px solid var(--border);
+        border-radius: var(--radius-md);
+        background: var(--surface);
+        color: var(--text);
+        font-size: var(--font-sm);
+    }
+    .action-filter {
+        min-width: 14rem;
+    }
+    .muted {
+        color: var(--text-muted);
+    }
+    table {
+        width: 100%;
+        border-collapse: collapse;
+    }
+    th,
+    td {
+        padding: var(--space-2);
+        text-align: left;
+        border-bottom: 1px solid var(--border);
+        font-size: var(--font-sm);
+    }
+    .action {
+        font-family: var(--font-mono, monospace);
+        font-size: var(--font-xs);
+    }
+    .target {
+        color: var(--text-muted);
+        font-size: var(--font-xs);
+    }
+    .actions {
+        text-align: right;
+        color: var(--text-muted);
+    }
+    .chev {
+        background: none;
+        border: none;
+        color: var(--text-muted);
+        cursor: pointer;
+        font-size: var(--font-sm);
+        padding: 2px var(--space-1);
+        border-radius: var(--radius-sm);
+    }
+    .chev:hover {
+        color: var(--text);
+        background: var(--surface-elevated);
+    }
+    tr.clickable {
+        cursor: pointer;
+    }
+    tr.clickable:hover {
+        background: var(--surface);
+    }
+    .payrow td {
+        background: var(--surface);
+    }
+    .payrow pre {
+        margin: 0;
+        white-space: pre-wrap;
+        word-break: break-word;
+        font-size: var(--font-xs);
+        color: var(--text-muted);
+    }
+    .error {
+        color: var(--danger, #dc2626);
+    }
+</style>

frontend/src/lib/components/admin/AuditTable.svelte.test.ts

@@ -0,0 +1,62 @@
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { render, screen, cleanup, waitFor } from '@testing-library/svelte';
+import AuditTable from './AuditTable.svelte';
+import * as adminApi from '$lib/api/admin';
+
+afterEach(() => {
+    cleanup();
+    vi.restoreAllMocks();
+});
+
+function entry(over: Partial<adminApi.AuditEntry> = {}): adminApi.AuditEntry {
+    return {
+        id: 'a-1',
+        actor_user_id: 'u-1',
+        actor_username: 'alice',
+        action: 'crawler_run',
+        target_kind: 'crawler',
+        target_id: null,
+        payload: { started: true },
+        at: '2026-06-01T00:00:00Z',
+        ...over
+    };
+}
+
+describe('AuditTable', () => {
+    it('renders rows with actor + action and expands the payload on click', async () => {
+        vi.spyOn(adminApi, 'listAuditLog').mockResolvedValue({
+            items: [entry()],
+            page: { limit: 25, offset: 0, total: 1 }
+        });
+        render(AuditTable);
+
+        await waitFor(() => expect(screen.getByText('crawler_run')).toBeTruthy());
+        expect(screen.getByText('alice')).toBeTruthy();
+        // Payload hidden until the row is clicked.
+        expect(screen.queryByText(/"started": true/)).toBeNull();
+        screen.getByTestId('audit-row-a-1').click();
+        await waitFor(() => expect(screen.getByText(/"started": true/)).toBeTruthy());
+    });
+
+    it('shows "system" actor when there is no actor, and "(deleted user)" when the id has no username', async () => {
+        vi.spyOn(adminApi, 'listAuditLog').mockResolvedValue({
+            items: [
+                entry({ id: 'a-sys', actor_user_id: null, actor_username: null }),
+                entry({ id: 'a-del', actor_user_id: 'u-x', actor_username: null })
+            ],
+            page: { limit: 25, offset: 0, total: 2 }
+        });
+        render(AuditTable);
+        await waitFor(() => expect(screen.getByText('system')).toBeTruthy());
+        expect(screen.getByText('(deleted user)')).toBeTruthy();
+    });
+
+    it('renders an empty state when there are no entries', async () => {
+        vi.spyOn(adminApi, 'listAuditLog').mockResolvedValue({
+            items: [],
+            page: { limit: 25, offset: 0, total: 0 }
+        });
+        render(AuditTable);
+        await waitFor(() => expect(screen.getByTestId('audit-empty')).toBeTruthy());
+    });
+});

frontend/src/lib/components/admin/HealthChecks.svelte

@@ -0,0 +1,306 @@
+<script lang="ts">
+    import { onMount, onDestroy } from 'svelte';
+    import {
+        getHealth,
+        updateHealthThresholds,
+        type HealthReport,
+        type HealthThresholds,
+        type CheckStatus
+    } from '$lib/api/admin';
+
+    const POLL_MS = 30_000;
+
+    let report = $state<HealthReport | null>(null);
+    let loading = $state(true);
+    let error = $state<string | null>(null);
+    let timer: ReturnType<typeof setInterval> | null = null;
+    let inflight: AbortController | null = null;
+
+    // Threshold editor state.
+    let editing = $state(false);
+    let form = $state<HealthThresholds | null>(null);
+    let saving = $state(false);
+    let saveError = $state<string | null>(null);
+    let saved = $state(false);
+
+    async function load() {
+        inflight?.abort();
+        const ctrl = new AbortController();
+        inflight = ctrl;
+        try {
+            const r = await getHealth({ signal: ctrl.signal });
+            report = r;
+            error = null;
+        } catch (e) {
+            if ((e as Error)?.name === 'AbortError') return;
+            error = e instanceof Error ? e.message : 'Failed to load health.';
+        } finally {
+            if (inflight === ctrl) loading = false;
+        }
+    }
+
+    onMount(() => {
+        load();
+        timer = setInterval(load, POLL_MS);
+    });
+    onDestroy(() => {
+        if (timer) clearInterval(timer);
+        inflight?.abort();
+    });
+
+    function startEdit() {
+        // Snapshot current thresholds into an editable copy.
+        form = report ? { ...report.thresholds } : null;
+        saveError = null;
+        saved = false;
+        editing = true;
+    }
+
+    async function save() {
+        if (!form) return;
+        saving = true;
+        saveError = null;
+        saved = false;
+        try {
+            report = await updateHealthThresholds(form);
+            saved = true;
+            editing = false;
+        } catch (e) {
+            saveError = e instanceof Error ? e.message : 'Failed to save thresholds.';
+        } finally {
+            saving = false;
+        }
+    }
+
+    const STATUS_GLYPH: Record<CheckStatus, string> = {
+        ok: '✓',
+        warn: '⚠',
+        critical: '✗'
+    };
+    const STATUS_LABEL: Record<CheckStatus, string> = {
+        ok: 'Healthy',
+        warn: 'Needs attention',
+        critical: 'Critical'
+    };
+
+    const failing = $derived(
+        report ? report.checks.filter((c) => c.status !== 'ok').length : 0
+    );
+
+    // Editable threshold fields, with units for the form labels.
+    const FIELDS: { key: keyof HealthThresholds; label: string; unit: string }[] = [
+        { key: 'disk_pct', label: 'Disk usage', unit: '%' },
+        { key: 'mem_pct', label: 'Memory usage', unit: '%' },
+        { key: 'dead_jobs_max', label: 'Dead jobs (max)', unit: '' },
+        { key: 'crawl_fail_pct', label: 'Crawl failure rate', unit: '%' },
+        { key: 'analysis_fail_pct', label: 'Analysis failure rate', unit: '%' },
+        { key: 'cron_freshness_hours', label: 'Cron freshness', unit: 'h' },
+        { key: 'missing_covers_max', label: 'Missing covers (max)', unit: '' }
+    ];
+</script>
+
+<section class="health" data-testid="health-checks">
+    {#if error}
+        <p class="error" role="alert">{error}</p>
+    {/if}
+
+    {#if loading && !report}
+        <p class="muted" data-testid="health-loading">Loading…</p>
+    {:else if report}
+        <header class="overall status-{report.status}" data-testid="health-overall">
+            <span class="glyph">{STATUS_GLYPH[report.status]}</span>
+            <span class="overall-label">{STATUS_LABEL[report.status]}</span>
+            {#if failing > 0}
+                <span class="muted">· {failing} check{failing === 1 ? '' : 's'} need attention</span>
+            {/if}
+        </header>
+
+        <ul class="checks">
+            {#each report.checks as c (c.id)}
+                <li class="check status-{c.status}" data-testid={`health-check-${c.id}`}>
+                    <span class="glyph" aria-hidden="true">{STATUS_GLYPH[c.status]}</span>
+                    <span class="label">{c.label}</span>
+                    <span class="value">
+                        {c.value}{#if c.threshold}<span class="muted"> / {c.threshold}</span>{/if}
+                    </span>
+                    <span class="meta">
+                        {#if c.hint}<span class="hint muted">{c.hint}</span>{/if}
+                        {#if c.action_href && c.status !== 'ok'}
+                            <a class="fix" href={c.action_href}>Fix →</a>
+                        {/if}
+                    </span>
+                </li>
+            {/each}
+        </ul>
+
+        <div class="thresholds">
+            <button
+                type="button"
+                class="disclosure"
+                onclick={() => (editing ? (editing = false) : startEdit())}
+                aria-expanded={editing}
+                data-testid="health-thresholds-toggle"
+            >
+                {editing ? '▾' : '▸'} Configure thresholds
+            </button>
+            {#if saved && !editing}<span class="ok-note">Saved ✓</span>{/if}
+
+            {#if editing && form}
+                <form
+                    class="threshold-form"
+                    onsubmit={(e) => {
+                        e.preventDefault();
+                        save();
+                    }}
+                >
+                    {#each FIELDS as f (f.key)}
+                        <label>
+                            <span>{f.label}{f.unit ? ` (${f.unit})` : ''}</span>
+                            <input
+                                type="number"
+                                step="1"
+                                min="0"
+                                bind:value={form[f.key]}
+                                data-testid={`threshold-${f.key}`}
+                            />
+                        </label>
+                    {/each}
+                    {#if saveError}<p class="error" role="alert">{saveError}</p>{/if}
+                    <div class="actions">
+                        <button type="submit" disabled={saving} data-testid="threshold-save">
+                            {saving ? 'Saving…' : 'Save'}
+                        </button>
+                        <button type="button" class="secondary" onclick={() => (editing = false)}>
+                            Cancel
+                        </button>
+                    </div>
+                </form>
+            {/if}
+        </div>
+    {/if}
+</section>
+
+<style>
+    .overall {
+        display: flex;
+        align-items: center;
+        gap: var(--space-2);
+        font-size: var(--font-md);
+        font-weight: var(--weight-semibold);
+        margin-bottom: var(--space-3);
+    }
+    .overall .glyph {
+        font-size: var(--font-lg);
+    }
+    .checks {
+        list-style: none;
+        margin: 0 0 var(--space-4) 0;
+        padding: 0;
+        border: 1px solid var(--border);
+        border-radius: var(--radius-md);
+    }
+    .check {
+        display: grid;
+        grid-template-columns: 1.4rem 1fr auto;
+        grid-template-areas: 'glyph label value' '. meta meta';
+        align-items: center;
+        gap: var(--space-1) var(--space-2);
+        padding: var(--space-2) var(--space-3);
+        border-bottom: 1px solid var(--border);
+        font-size: var(--font-sm);
+    }
+    .check:last-child {
+        border-bottom: none;
+    }
+    .check .glyph {
+        grid-area: glyph;
+        font-weight: var(--weight-semibold);
+    }
+    .label {
+        grid-area: label;
+    }
+    .value {
+        grid-area: value;
+        text-align: right;
+        font-variant-numeric: tabular-nums;
+    }
+    .meta {
+        grid-area: meta;
+        display: flex;
+        justify-content: space-between;
+        gap: var(--space-2);
+        font-size: var(--font-xs);
+    }
+    .hint {
+        font-size: var(--font-xs);
+    }
+    .fix {
+        white-space: nowrap;
+    }
+    /* Status colors on the glyph + left accent. */
+    .status-ok .glyph {
+        color: var(--success, #16a34a);
+    }
+    .status-warn {
+        box-shadow: inset 3px 0 0 var(--warning, #d97706);
+    }
+    .status-warn .glyph {
+        color: var(--warning, #d97706);
+    }
+    .status-critical {
+        box-shadow: inset 3px 0 0 var(--danger, #dc2626);
+    }
+    .status-critical .glyph {
+        color: var(--danger, #dc2626);
+    }
+    .muted {
+        color: var(--text-muted);
+    }
+    .disclosure {
+        background: none;
+        border: none;
+        color: var(--text);
+        cursor: pointer;
+        font-size: var(--font-sm);
+        padding: 0;
+    }
+    .ok-note {
+        margin-left: var(--space-2);
+        color: var(--success, #16a34a);
+        font-size: var(--font-sm);
+    }
+    .threshold-form {
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
+        gap: var(--space-3);
+        margin-top: var(--space-3);
+        max-width: 40rem;
+    }
+    .threshold-form label {
+        display: flex;
+        flex-direction: column;
+        gap: 2px;
+        font-size: var(--font-xs);
+        color: var(--text-muted);
+    }
+    .threshold-form input {
+        height: 34px;
+        padding: 0 var(--space-2);
+        border: 1px solid var(--border);
+        border-radius: var(--radius-md);
+        background: var(--surface);
+        color: var(--text);
+        font-size: var(--font-sm);
+    }
+    .threshold-form .actions {
+        grid-column: 1 / -1;
+        display: flex;
+        gap: var(--space-2);
+    }
+    button.secondary {
+        background: var(--surface-elevated);
+    }
+    .error {
+        color: var(--danger, #dc2626);
+    }
+</style>

frontend/src/lib/components/admin/HealthChecks.svelte.test.ts

@@ -0,0 +1,81 @@
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { render, screen, cleanup, waitFor, fireEvent } from '@testing-library/svelte';
+import HealthChecks from './HealthChecks.svelte';
+import * as adminApi from '$lib/api/admin';
+
+afterEach(() => {
+    cleanup();
+    vi.restoreAllMocks();
+});
+
+function thresholds(): adminApi.HealthThresholds {
+    return {
+        disk_pct: 90,
+        mem_pct: 90,
+        dead_jobs_max: 100,
+        crawl_fail_pct: 20,
+        analysis_fail_pct: 20,
+        cron_freshness_hours: 26,
+        missing_covers_max: 500
+    };
+}
+
+function report(over: Partial<adminApi.HealthReport> = {}): adminApi.HealthReport {
+    return {
+        status: 'warn',
+        checks: [
+            {
+                id: 'dead_jobs',
+                label: 'Dead jobs',
+                status: 'warn',
+                value: '137',
+                threshold: '100',
+                hint: 'jobs that exhausted their retries',
+                action_href: '/admin/crawler'
+            },
+            {
+                id: 'memory',
+                label: 'Memory usage',
+                status: 'ok',
+                value: '48%',
+                threshold: '90%',
+                hint: null,
+                action_href: null
+            }
+        ],
+        thresholds: thresholds(),
+        ...over
+    };
+}
+
+describe('HealthChecks', () => {
+    it('renders the overall status and each check, with a Fix link on failing ones', async () => {
+        vi.spyOn(adminApi, 'getHealth').mockResolvedValue(report());
+        render(HealthChecks);
+
+        await waitFor(() => expect(screen.getByTestId('health-overall')).toBeTruthy());
+        expect(screen.getByTestId('health-check-dead_jobs')).toBeTruthy();
+        expect(screen.getByText('137')).toBeTruthy();
+        // Failing check exposes a remediation link; the ok one does not.
+        const fix = screen.getByRole('link', { name: /fix/i }) as HTMLAnchorElement;
+        expect(fix.getAttribute('href')).toBe('/admin/crawler');
+    });
+
+    it('saves edited thresholds via updateHealthThresholds', async () => {
+        vi.spyOn(adminApi, 'getHealth').mockResolvedValue(report());
+        const update = vi
+            .spyOn(adminApi, 'updateHealthThresholds')
+            .mockResolvedValue(report({ status: 'ok' }));
+        render(HealthChecks);
+
+        await waitFor(() => expect(screen.getByTestId('health-thresholds-toggle')).toBeTruthy());
+        await fireEvent.click(screen.getByTestId('health-thresholds-toggle'));
+
+        const input = screen.getByTestId('threshold-dead_jobs_max') as HTMLInputElement;
+        await fireEvent.input(input, { target: { value: '250' } });
+        await fireEvent.click(screen.getByTestId('threshold-save'));
+
+        await waitFor(() => expect(update).toHaveBeenCalledTimes(1));
+        expect(update.mock.calls[0][0].dead_jobs_max).toBe(250);
+    });
+});

frontend/src/lib/components/analysis/AnalysisMetricsPanel.svelte

@@ -1,12 +1,20 @@
 <script lang="ts">
     import { onMount } from 'svelte';
     import { fmtDuration } from '$lib/format';
-    import { getAnalysisMetrics, type AnalysisMetrics } from '$lib/api/admin';
+    import TrendChart from '$lib/components/charts/TrendChart.svelte';
+    import { buildSeries, type TrendSeries } from '$lib/admin/series';
+    import {
+        getAnalysisMetrics,
+        getAnalysisMetricsSeries,
+        type AnalysisMetrics
+    } from '$lib/api/admin';
 
     let days = $state(7);
     let metrics = $state<AnalysisMetrics | null>(null);
     let loading = $state(true);
     let error = $state<string | null>(null);
+    let series = $state<TrendSeries | null>(null);
+    let seriesCtrl: AbortController | null = null;
 
     const successPct = $derived(
         metrics && metrics.n > 0 ? Math.round((metrics.ok / metrics.n) * 100) : null
@@ -22,6 +30,20 @@
         } finally {
             loading = false;
         }
+        loadSeries();
+    }
+
+    async function loadSeries() {
+        seriesCtrl?.abort();
+        const ctrl = new AbortController();
+        seriesCtrl = ctrl;
+        try {
+            const resp = await getAnalysisMetricsSeries(days, { signal: ctrl.signal });
+            series = buildSeries(resp.buckets, days);
+        } catch (e) {
+            if ((e as Error)?.name === 'AbortError') return;
+            // Chart failure is non-fatal — keep the tiles/table usable.
+        }
     }
 
     onMount(load);
@@ -45,6 +67,24 @@
     {:else if loading}
         <p class="muted">Loading…</p>
     {:else if metrics}
+        {#if series}
+            <div class="charts" data-testid="analysis-metrics-charts">
+                <TrendChart points={series.throughput} label="Pages analyzed (per bucket)" />
+                <TrendChart
+                    points={series.success}
+                    label="Success rate"
+                    format={(v) => `${v.toFixed(0)}%`}
+                    accent="var(--success, #16a34a)"
+                />
+                <TrendChart
+                    points={series.duration}
+                    label="Avg duration"
+                    format={(v) => fmtDuration(v)}
+                    accent="var(--warning, #d97706)"
+                />
+            </div>
+        {/if}
+
         <div class="tiles">
             <div class="tile">
                 <span class="label">Pages analyzed</span>
@@ -112,6 +152,13 @@
         color: var(--text);
         font-size: var(--font-sm);
     }
+    .charts {
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
+        gap: var(--space-3) var(--space-4);
+        margin-bottom: var(--space-4);
+        max-width: 60rem;
+    }
     .tiles {
         display: grid;
         grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));

frontend/src/lib/components/charts/TrendChart.svelte

@@ -0,0 +1,168 @@
+<script lang="ts">
+    // A small, dependency-free line+area sparkline for admin trend series.
+    // Null values render as gaps (a bucket with no data), so a missing point
+    // never draws a misleading line to zero.
+    type Point = { t: string; value: number | null };
+
+    let {
+        points,
+        label,
+        format = (v: number) => v.toFixed(0),
+        height = 72,
+        accent = 'var(--primary, #2563eb)'
+    }: {
+        points: Point[];
+        label: string;
+        format?: (v: number) => string;
+        height?: number;
+        accent?: string;
+    } = $props();
+
+    // Internal coordinate system; the SVG scales to its container width.
+    const W = 600;
+    const PAD = 6;
+
+    const values = $derived(
+        points.map((p) => p.value).filter((v): v is number => v != null)
+    );
+    const hasData = $derived(values.length > 0);
+    const max = $derived(hasData ? Math.max(...values) : 0);
+    const min = $derived(hasData ? Math.min(...values) : 0);
+    const latest = $derived.by(() => {
+        for (let i = points.length - 1; i >= 0; i--) {
+            if (points[i].value != null) return points[i].value as number;
+        }
+        return null;
+    });
+
+    function x(i: number): number {
+        if (points.length <= 1) return W / 2;
+        return PAD + (i / (points.length - 1)) * (W - 2 * PAD);
+    }
+    function y(v: number): number {
+        const range = max > min ? max - min : 1;
+        const norm = max > min ? (v - min) / range : 0.5;
+        const inner = height - 2 * PAD;
+        return PAD + (1 - norm) * inner;
+    }
+
+    // Break the series into runs of consecutive non-null points so gaps stay
+    // gaps. Each run becomes one line path and one area path.
+    type Run = { i: number; v: number }[];
+    const runs = $derived.by<Run[]>(() => {
+        const out: Run[] = [];
+        let cur: Run = [];
+        points.forEach((p, i) => {
+            if (p.value == null) {
+                if (cur.length) out.push(cur);
+                cur = [];
+            } else {
+                cur.push({ i, v: p.value });
+            }
+        });
+        if (cur.length) out.push(cur);
+        return out;
+    });
+
+    function linePath(run: Run): string {
+        return run.map((pt, k) => `${k === 0 ? 'M' : 'L'} ${x(pt.i).toFixed(1)} ${y(pt.v).toFixed(1)}`).join(' ');
+    }
+    function areaPath(run: Run): string {
+        if (run.length === 0) return '';
+        const base = height - PAD;
+        const top = run.map((pt) => `L ${x(pt.i).toFixed(1)} ${y(pt.v).toFixed(1)}`).join(' ');
+        const x0 = x(run[0].i).toFixed(1);
+        const xn = x(run[run.length - 1].i).toFixed(1);
+        return `M ${x0} ${base} ${top} L ${xn} ${base} Z`;
+    }
+
+    function shortTime(iso: string): string {
+        const d = new Date(iso);
+        return d.toLocaleString(undefined, { month: 'short', day: 'numeric', hour: 'numeric' });
+    }
+</script>
+
+<figure class="trend" data-testid="trend-chart">
+    <figcaption>
+        <span class="lbl">{label}</span>
+        {#if hasData}
+            <span class="muted"
+                >peak {format(max)} · latest {latest != null ? format(latest) : '—'}</span
+            >
+        {/if}
+    </figcaption>
+    {#if !hasData}
+        <div class="empty muted" style={`height:${height}px`} data-testid="trend-empty">
+            No data in this window
+        </div>
+    {:else}
+        <svg
+            viewBox={`0 0 ${W} ${height}`}
+            preserveAspectRatio="none"
+            role="img"
+            aria-label={`${label}: ${values.length} points, latest ${latest != null ? format(latest) : 'none'}, peak ${format(max)}`}
+        >
+            {#each runs as run, ri (ri)}
+                <path class="area" d={areaPath(run)} fill={accent} />
+                <path class="line" d={linePath(run)} stroke={accent} />
+                {#if run.length === 1}
+                    <circle cx={x(run[0].i)} cy={y(run[0].v)} r="3" fill={accent} />
+                {/if}
+            {/each}
+        </svg>
+        <div class="xaxis muted">
+            <span>{shortTime(points[0].t)}</span>
+            <span>{shortTime(points[points.length - 1].t)}</span>
+        </div>
+    {/if}
+</figure>
+
+<style>
+    .trend {
+        margin: 0 0 var(--space-3) 0;
+    }
+    figcaption {
+        display: flex;
+        justify-content: space-between;
+        align-items: baseline;
+        gap: var(--space-2);
+        font-size: var(--font-sm);
+        margin-bottom: 2px;
+    }
+    .lbl {
+        font-weight: var(--weight-medium);
+    }
+    svg {
+        width: 100%;
+        display: block;
+        background: var(--surface);
+        border: 1px solid var(--border);
+        border-radius: var(--radius-sm);
+    }
+    .area {
+        opacity: 0.12;
+        stroke: none;
+    }
+    .line {
+        fill: none;
+        stroke-width: 1.5;
+        vector-effect: non-scaling-stroke;
+    }
+    .xaxis {
+        display: flex;
+        justify-content: space-between;
+        font-size: var(--font-xs);
+        margin-top: 2px;
+    }
+    .empty {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        border: 1px dashed var(--border);
+        border-radius: var(--radius-sm);
+        font-size: var(--font-sm);
+    }
+    .muted {
+        color: var(--text-muted);
+    }
+</style>

frontend/src/lib/components/charts/TrendChart.svelte.test.ts

@@ -0,0 +1,53 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { render, screen, cleanup } from '@testing-library/svelte';
+import TrendChart from './TrendChart.svelte';
+
+afterEach(() => cleanup());
+
+describe('TrendChart', () => {
+    it('renders an empty state when there is no data', () => {
+        render(TrendChart, {
+            props: {
+                points: [
+                    { t: '2026-06-18T09:00:00Z', value: null },
+                    { t: '2026-06-18T10:00:00Z', value: null }
+                ],
+                label: 'Throughput'
+            }
+        });
+        expect(screen.getByTestId('trend-empty')).toBeTruthy();
+    });
+
+    it('draws a path and labels peak/latest when data is present', () => {
+        const { container } = render(TrendChart, {
+            props: {
+                points: [
+                    { t: '2026-06-18T09:00:00Z', value: 2 },
+                    { t: '2026-06-18T10:00:00Z', value: 6 },
+                    { t: '2026-06-18T11:00:00Z', value: 4 }
+                ],
+                label: 'Throughput'
+            }
+        });
+        const line = container.querySelector('path.line') as SVGPathElement;
+        expect(line).toBeTruthy();
+        expect(line.getAttribute('d')).toMatch(/^M /);
+        // Header summarizes peak + latest.
+        expect(screen.getByText(/peak 6 · latest 4/)).toBeTruthy();
+    });
+
+    it('breaks the line across null gaps into separate paths', () => {
+        const { container } = render(TrendChart, {
+            props: {
+                points: [
+                    { t: '2026-06-18T09:00:00Z', value: 2 },
+                    { t: '2026-06-18T10:00:00Z', value: null },
+                    { t: '2026-06-18T11:00:00Z', value: 4 }
+                ],
+                label: 'Success'
+            }
+        });
+        // Two runs → two line paths (and two area paths).
+        expect(container.querySelectorAll('path.line').length).toBe(2);
+    });
+});

frontend/src/lib/components/crawler/CrawlerControls.svelte

@@ -5,6 +5,7 @@
         status,
         busy,
         onRunPass,
+        onReconcile,
         onOpenRestart,
         onOpenSession,
         onClearExpired
@@ -12,6 +13,7 @@
         status: CrawlerStatus;
         busy: boolean;
         onRunPass: () => void;
+        onReconcile: () => void;
         onOpenRestart: () => void;
         onOpenSession: () => void;
         onClearExpired: () => void;
@@ -22,6 +24,12 @@
     <button onclick={onRunPass} disabled={busy || status.daemon !== 'running'}
         >Run metadata pass now</button
     >
+    <button
+        onclick={onReconcile}
+        disabled={busy || status.daemon !== 'running'}
+        title="Full list-only walk; enqueues mangas missing from the DB"
+        >Reconcile missing</button
+    >
     <button onclick={onOpenRestart} disabled={busy || status.daemon !== 'running'}
         >Restart browser</button
     >

frontend/src/lib/components/crawler/CrawlerHero.svelte

@@ -17,6 +17,8 @@
                 return `Fetching metadata · ${p.index}/${p.total ?? '?'} · ${p.title}`;
             case 'cover_backfill':
                 return `Backfilling covers · ${p.index + 1}/${p.total}`;
+            case 'reconciling':
+                return `Reconciling · walked ${p.walked} · enqueued ${p.enqueued}`;
             default: {
                 // Exhaustive default: if a new phase state ships
                 // without a label, TypeScript flags the missing case

frontend/src/lib/components/crawler/CrawlerHistoryTable.svelte

@@ -71,7 +71,8 @@
         await load();
     }
 
-    /** A human "Manga · Ch N · pP" target, or the source key / em-dash. */
+    /** A human "Manga · Ch N · pP" target. Falls back to the payload title
+     *  (sync_manga jobs with no manga row yet), then the source key. */
     function target(r: CrawlerHistoryRow): string {
         if (r.manga_title) {
             let s = r.manga_title;
@@ -79,7 +80,7 @@
             if (r.page_number != null) s += ` · p${r.page_number}`;
             return s;
         }
-        return r.source_key ?? '—';
+        return r.payload_title ?? r.source_key ?? '—';
     }
 
     function fmtAgo(iso: string): string {
@@ -172,7 +173,15 @@
                             <span class="badge state-{r.state}">{r.state}</span>
                         </td>
                         <td class="kind">{r.kind ?? '—'}</td>
-                        <td>{target(r)}</td>
+                        <td>
+                            {#if !r.manga_title && r.payload_title && r.source_url}
+                                <a href={r.source_url} target="_blank" rel="noreferrer noopener"
+                                    >{target(r)}</a
+                                >
+                            {:else}
+                                {target(r)}
+                            {/if}
+                        </td>
                         <td class="num">{fmtDuration(r.duration_ms)}</td>
                         <td>{r.attempts}/{r.max_attempts}</td>
                         <td title={new Date(r.updated_at).toLocaleString()}

frontend/src/lib/components/crawler/CrawlerMetricsPanel.svelte

@@ -2,8 +2,11 @@
     import { onMount } from 'svelte';
     import Pager from '$lib/components/Pager.svelte';
     import { fmtDuration } from '$lib/format';
+    import TrendChart from '$lib/components/charts/TrendChart.svelte';
+    import { buildSeries, type TrendSeries } from '$lib/admin/series';
     import {
         getCrawlerMetrics,
+        getCrawlerMetricsSeries,
         listCrawlerOps,
         type OpSummary,
         type OpRow,
@@ -15,6 +18,8 @@
     let days = $state(7);
     let summary = $state<OpSummary[]>([]);
     let summaryLoading = $state(true);
+    let series = $state<TrendSeries | null>(null);
+    let seriesCtrl: AbortController | null = null;
 
     let rows = $state<OpRow[]>([]);
     let total = $state(0);
@@ -65,6 +70,19 @@
         }
     }
 
+    async function loadSeries() {
+        seriesCtrl?.abort();
+        const ctrl = new AbortController();
+        seriesCtrl = ctrl;
+        try {
+            const resp = await getCrawlerMetricsSeries(days, { signal: ctrl.signal });
+            series = buildSeries(resp.buckets, days);
+        } catch (e) {
+            if ((e as Error)?.name === 'AbortError') return;
+            // A chart failure shouldn't blank the whole panel; leave prior series.
+        }
+    }
+
     async function loadOps() {
         opsLoading = true;
         try {
@@ -86,12 +104,14 @@
 
     onMount(() => {
         loadSummary();
+        loadSeries();
         loadOps();
     });
 
     function onWindowChange() {
         page = 1;
         loadSummary();
+        loadSeries();
         loadOps();
     }
     function onOpsFilter() {
@@ -138,6 +158,24 @@
         <p class="error" role="alert">{error}</p>
     {/if}
 
+    {#if series}
+        <div class="charts" data-testid="crawler-metrics-charts">
+            <TrendChart points={series.throughput} label="Throughput (ops/bucket)" />
+            <TrendChart
+                points={series.success}
+                label="Success rate"
+                format={(v) => `${v.toFixed(0)}%`}
+                accent="var(--success, #16a34a)"
+            />
+            <TrendChart
+                points={series.duration}
+                label="Avg duration"
+                format={(v) => fmtDuration(v)}
+                accent="var(--warning, #d97706)"
+            />
+        </div>
+    {/if}
+
     <h2>Average durations by type</h2>
     {#if summaryLoading}
         <p class="muted">Loading…</p>
@@ -246,6 +284,13 @@
         justify-content: flex-end;
         margin-bottom: var(--space-2);
     }
+    .charts {
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
+        gap: var(--space-3) var(--space-4);
+        margin-bottom: var(--space-4);
+        max-width: 60rem;
+    }
     label {
         font-size: var(--font-sm);
         color: var(--text-muted);

frontend/src/lib/components/crawler/DeadJobsTable.svelte

@@ -56,7 +56,19 @@
                 {#each jobs as j (j.id)}
                     <tr>
                         <td>
-                            {j.manga_title ?? '(unknown)'}
+                            {#if j.manga_title}
+                                {j.manga_title}
+                            {:else if j.payload_title}
+                                {#if j.source_url}
+                                    <a href={j.source_url} target="_blank" rel="noreferrer noopener"
+                                        >{j.payload_title}</a
+                                    >
+                                {:else}
+                                    {j.payload_title}
+                                {/if}
+                            {:else}
+                                {j.source_key ?? '(unknown)'}
+                            {/if}
                             {#if j.chapter_number != null}· ch.{j.chapter_number}{/if}
                         </td>
                         <td>{j.attempts}/{j.max_attempts}</td>

frontend/src/lib/components/crawler/DeadJobsTable.svelte.test.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { render, screen, cleanup } from '@testing-library/svelte';
+import DeadJobsTable from './DeadJobsTable.svelte';
+import type { DeadJob } from '$lib/api/admin';
+
+afterEach(() => cleanup());
+
+function deadJob(overrides: Partial<DeadJob>): DeadJob {
+    return {
+        id: 'job-1',
+        kind: 'sync_chapter_content',
+        chapter_id: null,
+        manga_id: null,
+        manga_title: null,
+        chapter_number: null,
+        payload_title: null,
+        source_url: null,
+        source_key: null,
+        attempts: 5,
+        max_attempts: 5,
+        last_error: 'boom',
+        updated_at: '2026-06-16T00:00:00Z',
+        ...overrides
+    };
+}
+
+function baseProps(jobs: DeadJob[]) {
+    return {
+        jobs,
+        total: jobs.length,
+        page: 1,
+        totalPages: 1,
+        search: '',
+        busy: false,
+        onSearch: () => {},
+        onPageChange: () => {},
+        onRequeue: () => {},
+        onRequeueAll: () => {}
+    };
+}
+
+describe('DeadJobsTable', () => {
+    it('prefers manga_title when present', () => {
+        const jobs = [deadJob({ manga_title: 'Naruto', chapter_number: 700 })];
+        render(DeadJobsTable, { props: baseProps(jobs) });
+        expect(screen.getByText(/Naruto/)).toBeTruthy();
+    });
+
+    it('falls back to payload_title (linked to source_url) for a sync_manga job with no manga row', () => {
+        const jobs = [
+            deadJob({
+                kind: 'sync_manga',
+                manga_title: null,
+                payload_title: 'Ghost Manga',
+                source_url: 'http://x/manga/gone-1',
+                source_key: 'gone-1'
+            })
+        ];
+        render(DeadJobsTable, { props: baseProps(jobs) });
+        const link = screen.getByRole('link', { name: 'Ghost Manga' }) as HTMLAnchorElement;
+        expect(link.getAttribute('href')).toBe('http://x/manga/gone-1');
+    });
+
+    it('falls back to source_key when there is no title at all', () => {
+        const jobs = [deadJob({ kind: 'sync_manga', source_key: 'only-key' })];
+        render(DeadJobsTable, { props: baseProps(jobs) });
+        expect(screen.getByText('only-key')).toBeTruthy();
+    });
+});

frontend/src/lib/format.ts

@@ -12,3 +12,17 @@ export function fmtDuration(ms: number | null | undefined): string {
     const rem = whole % 60;
     return `${mins}m ${String(rem).padStart(2, '0')}s`;
 }
+
+/** Relative "time ago" from an ISO timestamp, falling back to a locale date
+ *  once it's more than a day old. `now` is injectable for tests. */
+export function fmtAgo(iso: string, now: number = Date.now()): string {
+    const then = new Date(iso).getTime();
+    const secs = Math.round((now - then) / 1000);
+    if (secs < 45) return 'just now';
+    if (secs < 90) return '1m ago';
+    const mins = Math.round(secs / 60);
+    if (mins < 60) return `${mins}m ago`;
+    const hrs = Math.round(mins / 60);
+    if (hrs < 24) return `${hrs}h ago`;
+    return new Date(iso).toLocaleDateString();
+}

frontend/src/routes/admin/+layout.svelte

@@ -4,12 +4,14 @@
 
     const tabs = [
         { href: '/admin', label: 'Overview' },
+        { href: '/admin/health', label: 'Health' },
         { href: '/admin/users', label: 'Users' },
         { href: '/admin/mangas', label: 'Mangas' },
         { href: '/admin/crawler', label: 'Crawler' },
         { href: '/admin/analysis', label: 'Analysis' },
         { href: '/admin/settings', label: 'Settings' },
-        { href: '/admin/system', label: 'System' }
+        { href: '/admin/system', label: 'System' },
+        { href: '/admin/audit', label: 'Audit' }
     ];
 </script>
 

frontend/src/routes/admin/+page.svelte

@@ -9,11 +9,13 @@
         analysisStatusStreamUrl,
         getCrawlerSettings,
         getAnalysisSettings,
+        getHealth,
         type SystemStats,
         type OverviewStats,
         type CrawlerStatus,
         type AnalysisMetrics,
-        type AnalysisEvent
+        type AnalysisEvent,
+        type HealthReport
     } from '$lib/api/admin';
     import { formatBytes as fmtBytes } from '$lib/upload-validation';
     import type { LayoutData } from './$types';
@@ -44,6 +46,8 @@
     let liveCrawler = $state(false);
     let liveAnalysis = $state(false);
 
+    let health = $state<HealthReport | null>(null);
+
     let sysTimer: ReturnType<typeof setInterval> | null = null;
     let overviewTimer: ReturnType<typeof setInterval> | null = null;
     let crawlerSource: EventSource | null = null;
@@ -86,6 +90,17 @@
             // ignore
         }
     }
+    async function refreshHealth() {
+        try {
+            health = await getHealth();
+        } catch {
+            // keep the last good snapshot; retried next tick
+        }
+    }
+
+    const healthFailing = $derived(
+        health ? health.checks.filter((c) => c.status !== 'ok').length : 0
+    );
     async function loadSettings() {
         try {
             const c = await getCrawlerSettings();
@@ -183,6 +198,7 @@
         refreshSys();
         refreshOverview();
         refreshMetrics();
+        refreshHealth();
         loadSettings();
         getCrawlerStatus()
             .then((s) => (crawler = s))
@@ -196,6 +212,7 @@
         overviewTimer = setInterval(() => {
             refreshOverview();
             refreshMetrics();
+            refreshHealth();
         }, 60000);
         if (typeof document !== 'undefined') {
             document.addEventListener('visibilitychange', onVisibilityChange);
@@ -237,6 +254,26 @@
 
 <h1>Overview</h1>
 
+{#if health}
+    <a
+        class="health-summary status-{health.status}"
+        href="/admin/health"
+        data-testid="overview-health"
+    >
+        <span class="glyph" aria-hidden="true"
+            >{health.status === 'ok' ? '✓' : health.status === 'warn' ? '⚠' : '✗'}</span
+        >
+        <span class="hs-label">
+            {#if health.status === 'ok'}
+                All health checks passing
+            {:else}
+                {healthFailing} health check{healthFailing === 1 ? '' : 's'} need attention
+            {/if}
+        </span>
+        <span class="hs-view">View →</span>
+    </a>
+{/if}
+
 {#if sys.alerts.length > 0 || extraAlerts.length > 0}
     <section class="alerts" data-testid="admin-alerts">
         {#each sys.alerts as a (a.message)}
@@ -434,6 +471,44 @@
     h1 {
         margin: 0 0 var(--space-4) 0;
     }
+    .health-summary {
+        display: flex;
+        align-items: center;
+        gap: var(--space-2);
+        padding: var(--space-2) var(--space-3);
+        margin-bottom: var(--space-3);
+        border: 1px solid var(--border);
+        border-radius: var(--radius-md);
+        background: var(--surface);
+        color: var(--text);
+        font-size: var(--font-sm);
+    }
+    .health-summary:hover {
+        background: var(--surface-elevated);
+        text-decoration: none;
+    }
+    .health-summary .glyph {
+        font-weight: var(--weight-semibold);
+    }
+    .health-summary .hs-view {
+        margin-left: auto;
+        color: var(--text-muted);
+    }
+    .health-summary.status-ok .glyph {
+        color: var(--success, #16a34a);
+    }
+    .health-summary.status-warn {
+        border-left: 4px solid var(--warning, #d97706);
+    }
+    .health-summary.status-warn .glyph {
+        color: var(--warning, #d97706);
+    }
+    .health-summary.status-critical {
+        border-left: 4px solid var(--danger, #dc2626);
+    }
+    .health-summary.status-critical .glyph {
+        color: var(--danger, #dc2626);
+    }
     .alerts {
         display: flex;
         flex-direction: column;

frontend/src/routes/admin/audit/+page.svelte

@@ -0,0 +1,25 @@
+<script lang="ts">
+    import AuditTable from '$lib/components/admin/AuditTable.svelte';
+</script>
+
+<svelte:head><title>Audit log · Admin</title></svelte:head>
+
+<h1>Audit log</h1>
+<p class="lead">
+    Every admin action — crawler runs, resyncs, settings changes, session
+    updates — is recorded here. Click a row to inspect its payload.
+</p>
+
+<AuditTable />
+
+<style>
+    h1 {
+        margin-bottom: var(--space-2);
+    }
+    .lead {
+        color: var(--text-muted);
+        font-size: var(--font-sm);
+        margin-bottom: var(--space-4);
+        max-width: 44rem;
+    }
+</style>

frontend/src/routes/admin/crawler/+page.svelte

@@ -16,6 +16,7 @@
         getCrawlerStatus,
         crawlerStatusStreamUrl,
         runCrawlerPass,
+        reconcileCrawler,
         restartCrawlerBrowser,
         updateCrawlerSession,
         clearCrawlerSessionExpired,
@@ -308,6 +309,13 @@
         });
     }
 
+    async function onReconcile() {
+        await withBusy('reconcile', async () => {
+            await reconcileCrawler();
+            notice = 'Reconcile started — walking the full list for missing mangas.';
+        });
+    }
+
     async function onConfirmRestart() {
         restartModalOpen = false;
         await withBusy('restart browser', async () => {
@@ -427,6 +435,7 @@
         {status}
         {busy}
         {onRunPass}
+        {onReconcile}
         onOpenRestart={() => (restartModalOpen = true)}
         onOpenSession={() => {
             sessionModalOpen = true;

frontend/src/routes/admin/health/+page.svelte

@@ -0,0 +1,26 @@
+<script lang="ts">
+    import HealthChecks from '$lib/components/admin/HealthChecks.svelte';
+</script>
+
+<svelte:head><title>Health · Admin</title></svelte:head>
+
+<h1>Health</h1>
+<p class="lead">
+    Operational checks rolled up from system sensors, the job queue, recent
+    failure rates and the crawler daemon. Thresholds are editable below and
+    apply immediately.
+</p>
+
+<HealthChecks />
+
+<style>
+    h1 {
+        margin-bottom: var(--space-2);
+    }
+    .lead {
+        color: var(--text-muted);
+        font-size: var(--font-sm);
+        margin-bottom: var(--space-4);
+        max-width: 44rem;
+    }
+</style>