Add daily cleanup of old notifications in EventsWorker: Implement a new method to delete notifications older than 30 days, enhancing database management and reducing clutter. Update run loop to trigger this cleanup daily, ensuring timely maintenance of notification records.

src/worker/events.rs

@@ -402,6 +402,7 @@ impl EventsWorker {
 
     fn run_loop(pool: ConnectionPool, broker: MessageBroker, state: Arc<WorkerState>) {
         let mut last_event_check = None;
+        let mut last_notification_cleanup: Option<Instant> = None;
         let mut rng = rand::thread_rng();
         let events = Self::initialize_events();
         eprintln!("[EventsWorker] Worker-Thread gestartet");
@@ -414,7 +415,6 @@ impl EventsWorker {
             let now = Instant::now();
 
             // Heartbeat im Run-Loop (unabhängig davon, ob Events triggern)
-            // Damit man sofort sieht, ob der Worker überhaupt läuft.
             static LAST_RUNLOOP_HEARTBEAT: Mutex<Option<Instant>> = Mutex::new(None);
             {
                 let mut last = LAST_RUNLOOP_HEARTBEAT.lock().unwrap();
@@ -441,8 +441,13 @@ impl EventsWorker {
                 last_event_check = Some(now);
             }
 
-            // 10-Sekunden-Wartezeit in kurze Scheiben aufteilen, damit ein Shutdown
-            // (running_worker = false) schnell greift.
+            // Alte Notifications einmal täglich aufräumen (alle 24 Stunden)
+            if should_run_interval(last_notification_cleanup, now, Duration::from_secs(86400)) {
+                Self::cleanup_old_notifications(&pool);
+                last_notification_cleanup = Some(now);
+            }
+
+            // 10-Sekunden-Wartezeit in kurze Scheiben aufteilen
             const SLICE_MS: u64 = 500;
             let total_ms = 10_000;
             let mut slept = 0;
@@ -458,6 +463,25 @@ impl EventsWorker {
         }
     }
 
+    fn cleanup_old_notifications(pool: &ConnectionPool) {
+        use crate::worker::sql::QUERY_DELETE_OLD_NOTIFICATIONS;
+
+        let result = (|| -> Result<(), DbError> {
+            let mut conn = pool
+                .get()
+                .map_err(|e| DbError::new(format!("DB-Verbindung fehlgeschlagen: {e}")))?;
+
+            conn.prepare("delete_old_notifications", QUERY_DELETE_OLD_NOTIFICATIONS)?;
+            conn.execute("delete_old_notifications", &[])?;
+            Ok(())
+        })();
+
+        match result {
+            Ok(()) => eprintln!("[EventsWorker] Alte Notifications (>30 Tage) aufgeräumt"),
+            Err(err) => eprintln!("[EventsWorker] Fehler beim Aufräumen alter Notifications: {err}"),
+        }
+    }
+
     // Globaler Skalierungsfaktor für Ereignisfrequenz.
     // Default: 1.0 (unverändert). Optional per ENV `EVENT_RATE_SCALE` konfigurierbar.
     fn event_rate_scale() -> f64 {