pmaxhogan
diff --git a/‎Cargo.lock‎
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diff --git a/‎README.md‎
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diff --git a/‎src-tauri/src/app_state.rs‎
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diff --git a/‎src-tauri/src/commands/dtos.rs‎
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@@ -96,7 +96,7 @@ Notes:
 - ³¹ rclone and restic are command-line tools; their GUIs are separate third-party projects (for example RcloneView, Backrest).
 - ³² Duplicati runs as a background service with a local web UI plus a tray helper, not a native desktop app.
 - ³³ restic search and selective restore are driven from the CLI (or a mounted snapshot), not an in-app browser.
-- ³⁴ Driven writes daily rolling logs (pruned at 14 days / 25 MB) that interleave backend tracing with the webview's own console output, and the in-app diagnostics export bundles them.
+- ³⁴ Driven writes daily rolling logs (pruned at 14 days / 25 MB, widened to 250 MB while the opt-in Debug logging toggle is on) that interleave backend tracing with the webview's own console output, and the in-app diagnostics export bundles them.
 - ³⁵ rclone logs to a file only when you pass `--log-file` (rotation via `--log-file-max-size` and friends), and has no bundle export; its bug template asks you to attach a log you produced by hand.
 - ³⁶ Duplicati's "Create bug report" export is a genuine one-click bundle (system info plus an obfuscated copy of the local database), and its web UI has a live log view; file logging is opt-in via `--log-file`, defaults to warnings only, and does not rotate.
 - ³⁷ restic has no log-file option at all - output goes to stdout, and the only file logging is an unrotated `DEBUG_LOG` env var that its contributing guide asks you to redact yourself.
@@ -189,7 +189,12 @@ These move: check each project's current docs before relying on a cell.
 - Rolling local log files covering both the backend and the webview console,
   collected into a one-click diagnostics bundle alongside a redacted summary of
   in-flight upload recovery state and a trailing window of process-memory
-  samples.
+  samples. An opt-in Debug logging toggle (Settings > Privacy & Data) raises
+  logs to per-file / IPC-trace / engine-state detail and widens the bundle
+  with an unredacted engine-state snapshot for the hardest bugs - it warns you
+  up front that this logs file names, full paths, and timing data, can slow
+  backups down, and turns itself off automatically after 24 hours; every other
+  part of the bundle stays redacted regardless.
 - In-app auto-update with signed update manifests and a stable / dev channel
   selector.
 - Anonymous, opt-out telemetry (coarse counts only; never file names, paths, or
 
@@ -308,6 +308,12 @@ pub struct AppState {
     /// issue #308 (2026-08-17 follow-up): live bottleneck-classification
     /// sampling runtime (the Activity dashboard's Bottleneck stat tile).
     bottleneck: BottleneckRuntime,
+    /// issue #309: the debug-logging-mode 24h auto-off watchdog's task handle
+    /// and shutdown signal, so the app-quit drain joins it with no orphan
+    /// (mirrors [`UpdaterRuntime`]/[`IostatRuntime`]). No shared "hub" field
+    /// like those two - the watchdog only reads/writes the persisted settings
+    /// KV directly, nothing else on `AppState` needs to observe it.
+    debug_mode: DebugModeRuntime,
     /// The ONE in-flight streaming exclusion preview
     /// ([`crate::commands::exclusion_stream`]). The exclusion editor re-previews
     /// on every rule edit, so without a single-slot registry a user tweaking
@@ -440,6 +446,22 @@ pub struct BottleneckRuntime {
     shutdown: std::sync::Mutex<Option<watch::Sender<bool>>>,
 }
 
+/// issue #309: the debug-logging-mode 24h auto-off watchdog's runtime state
+/// held on [`AppState`] - just the task's lifecycle slots (mirrors
+/// [`UpdaterRuntime`]/[`TelemetryRuntime`]'s task+shutdown pair). No "hub"
+/// field like [`BottleneckRuntime`]/[`IostatRuntime`]: the watchdog reads and
+/// writes the persisted `global.debug_logging_*` settings directly via its
+/// `StateRepo` handle, so there is nothing else on `AppState` for another
+/// caller to read.
+#[derive(Default)]
+pub struct DebugModeRuntime {
+    /// The spawned watchdog task, behind `Option` so the shutdown drain can
+    /// TAKE + await it by value; `None` once drained / never spawned.
+    task: std::sync::Mutex<Option<JoinHandle<()>>>,
+    /// The shutdown signal the watchdog `select!`s on.
+    shutdown: std::sync::Mutex<Option<watch::Sender<bool>>>,
+}
+
 /// M9b (SPEC s16): the anonymous-telemetry runtime state held on [`AppState`].
 ///
 /// `task` + `shutdown` track the single app-wide periodic-ping task so the quit
@@ -702,6 +724,7 @@ impl AppState {
             updater: UpdaterRuntime::default(),
             iostat: IostatRuntime::default(),
             bottleneck: BottleneckRuntime::default(),
+            debug_mode: DebugModeRuntime::default(),
             exclusion_previews: Arc::default(),
             preview_tree_cache: Arc::default(),
             telemetry: TelemetryRuntime::default(),
@@ -1104,6 +1127,44 @@ impl AppState {
             .take()
     }
 
+    // --- issue #309: debug-logging-mode watchdog runtime ----------------------
+
+    /// Register the spawned watchdog task + its shutdown sender so the
+    /// app-quit drain can stop + join it with no orphan (mirrors
+    /// [`Self::set_bottleneck_task`]).
+    pub fn set_debug_mode_task(&self, task: JoinHandle<()>, shutdown: watch::Sender<bool>) {
+        *self
+            .debug_mode
+            .task
+            .lock()
+            .unwrap_or_else(|e| e.into_inner()) = Some(task);
+        *self
+            .debug_mode
+            .shutdown
+            .lock()
+            .unwrap_or_else(|e| e.into_inner()) = Some(shutdown);
+    }
+
+    /// Signal the watchdog to stop and TAKE its handle so the quit drain can
+    /// await it. Mirrors [`Self::shutdown_bottleneck_task`].
+    #[must_use]
+    pub fn shutdown_debug_mode_task(&self) -> Option<JoinHandle<()>> {
+        if let Some(tx) = self
+            .debug_mode
+            .shutdown
+            .lock()
+            .unwrap_or_else(|e| e.into_inner())
+            .take()
+        {
+            let _ = tx.send(true);
+        }
+        self.debug_mode
+            .task
+            .lock()
+            .unwrap_or_else(|e| e.into_inner())
+            .take()
+    }
+
     // --- M9b telemetry runtime (SPEC s16) ----------------------------------
 
     /// M9b: register the spawned periodic-ping task + its shutdown sender so the
@@ -2119,6 +2180,43 @@ pub(crate) mod tests {
         let _ = std::fs::remove_dir_all(dir);
     }
 
+    #[tokio::test]
+    async fn debug_mode_runtime_task_and_shutdown_round_trip() {
+        // Issue #309: the debug-logging-mode watchdog's runtime bookkeeping.
+        // No hub getter to cover (unlike bottleneck/iostat) - just the
+        // set/shutdown task pair, mirrors
+        // `bottleneck_runtime_hub_task_and_shutdown_round_trip`.
+        let (state, dir) = temp_state().await;
+        let app_state = AppState::new(
+            state,
+            HashMap::new(),
+            RemoteMode::Fake,
+            default_fake_registry(),
+        );
+
+        // No task registered yet: shutdown is a safe no-op.
+        assert!(app_state.shutdown_debug_mode_task().is_none());
+
+        // Register a task that exits promptly on the shutdown signal (the
+        // real watchdog's own shape), then confirm shutdown signals + hands
+        // back the handle so the quit drain can join it.
+        let (shutdown_tx, mut shutdown_rx) = watch::channel(false);
+        let task = tokio::spawn(async move {
+            let _ = shutdown_rx.changed().await;
+        });
+        app_state.set_debug_mode_task(task, shutdown_tx);
+
+        let handle = app_state
+            .shutdown_debug_mode_task()
+            .expect("the just-registered task round-trips");
+        handle.await.unwrap();
+
+        // Taken: a second shutdown call is again a safe no-op.
+        assert!(app_state.shutdown_debug_mode_task().is_none());
+
+        let _ = std::fs::remove_dir_all(dir);
+    }
+
     #[tokio::test]
     async fn vss_helper_manager_installs_and_shutdown_is_noop() {
         // Issue #25: AppState owns the least-privilege VSS helper broker manager -
 
@@ -968,6 +968,23 @@ pub struct GlobalSettings {
     /// the unchanged V1 behaviour; `false` exempts EXACTLY the reachability
     /// pause-reason family from the gate (a captive portal still pauses).
     pub pause_when_offline: bool,
+    /// Issue #309: debug logging mode. When `true` the live `tracing` filter
+    /// is raised to a verbose directive (per-file activity, IPC traces, state
+    /// transitions, reconcile/queue decisions) and the diagnostic bundle
+    /// gains a debug section; both cost noticeable performance and log
+    /// verbose paths/timings, so this defaults `false` and auto-clears itself
+    /// (see [`Self::debug_logging_expires_at_ms`]). `serde(default)` so a
+    /// `global` blob persisted before this field still deserialises as off.
+    #[serde(default)]
+    pub debug_logging_enabled: bool,
+    /// Issue #309: the epoch-ms deadline [`Self::debug_logging_enabled`]
+    /// auto-turns-off at (set to `now + 24h` whenever the toggle is switched
+    /// on). Persisted (not just an in-memory timer) so a restart mid-window
+    /// still honours the original deadline rather than granting a fresh 24h.
+    /// `None` when debug logging is off. `serde(default)` for the same
+    /// pre-#309 backward-compat reason as the toggle itself.
+    #[serde(default)]
+    pub debug_logging_expires_at_ms: Option<i64>,
 }
 
 /// V2 schedule-window settings (DESIGN s17). Mirrors
@@ -1288,6 +1305,11 @@ pub struct GlobalSettingsPatch {
     pub proxy_url: Option<Option<String>>,
     /// See [`GlobalSettings::pause_when_offline`]. Absent = unchanged.
     pub pause_when_offline: Option<bool>,
+    /// See [`GlobalSettings::debug_logging_enabled`]. Absent = unchanged;
+    /// present = set it (the backend computes/clears
+    /// `debug_logging_expires_at_ms` itself - that field is not directly
+    /// patchable from the webview).
+    pub debug_logging_enabled: Option<bool>,
 }
 
 /// Partial SPEC s22 `telemetry` settings.