feat: add settings table and backup notification functionality

backup-db.mjs

@@ -19,6 +19,27 @@ fs.copyFileSync(dbPath, backupPath);
 
 console.log(`✅ Backup created: ${backupPath}`);
 
+// Send notification if configured
+try {
+    const { createNotification, NOTIFICATION_TYPES } = await import("./src/lib/notifications.js");
+    const db = (await import("./src/lib/db.js")).default;
+    
+    const setting = db.prepare("SELECT value FROM settings WHERE key = 'backup_notification_user_id'").get();
+    if (setting && setting.value) {
+        const userId = setting.value;
+        await createNotification({
+            userId,
+            type: NOTIFICATION_TYPES.SYSTEM_ANNOUNCEMENT,
+            title: "Database Backup Completed",
+            message: `Daily database backup completed successfully. Backup file: ${backupPath}`,
+            priority: "normal"
+        });
+        console.log(`📢 Notification sent to user ${userId}`);
+    }
+} catch (error) {
+    console.error("Failed to send backup notification:", error);
+}
+
 // Cleanup: keep only last 30 backups
 const files = fs.readdirSync(backupDir)
     .filter(f => f.startsWith('backup-'))