fix: [30388f42] Maximiere DB-Performance und behebe Locking-Endlosschleife

- Aktiviert den SQLite WAL-Modus für echtes Concurrent Reading/Writing.
- Optimiert get_next_job, um unnötige EXCLUSIVE-Locks zu vermeiden.
- Dies stellt sicher, dass Jobs nach der Verarbeitung korrekt als COMPLETED markiert werden und der Worker nicht in einer Wiederholungsschleife gefangen bleibt.

connector-superoffice/queue_manager.py

@@ -11,6 +11,8 @@ class JobQueue:
 
     def _init_db(self):
         with sqlite3.connect(DB_PATH, timeout=30) as conn:
+            # Enable WAL mode for better concurrency
+            conn.execute("PRAGMA journal_mode=WAL")
             conn.execute("""
                 CREATE TABLE IF NOT EXISTS jobs (
                     id INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -66,35 +68,31 @@ class JobQueue:
             conn.row_factory = sqlite3.Row
             cursor = conn.cursor()
             
-            # Lock the job
-            cursor.execute("BEGIN EXCLUSIVE")
-            try:
-                cursor.execute("""
-                    SELECT id, event_type, payload, created_at 
-                    FROM jobs 
-                    WHERE status = 'PENDING' 
-                    AND (next_try_at IS NULL OR next_try_at <= datetime('now'))
-                    ORDER BY created_at ASC 
-                    LIMIT 1
-                """)
-                row = cursor.fetchone()
+            cursor.execute("""
+                SELECT id, event_type, payload, created_at 
+                FROM jobs 
+                WHERE status = 'PENDING' 
+                AND (next_try_at IS NULL OR next_try_at <= datetime('now'))
+                ORDER BY created_at ASC 
+                LIMIT 1
+            """)
+            row = cursor.fetchone()
             
-                if row:
-                    job = dict(row)
-                    # Mark as processing
-                    cursor.execute(
-                        "UPDATE jobs SET status = 'PROCESSING', updated_at = datetime('now') WHERE id = ?",
-                        (job['id'],)
-                    )
-                    conn.commit()
-                else:
-                    conn.rollback() # No job found
-            except Exception:
-                conn.rollback()
-                raise
+            if row:
+                job = dict(row)
+                # Mark as processing
+                cursor.execute(
+                    "UPDATE jobs SET status = 'PROCESSING', updated_at = datetime('now') WHERE id = ?",
+                    (job['id'],)
+                )
+                conn.commit()
                 
         if job:
-            job['payload'] = json.loads(job['payload'])
+            try:
+                job['payload'] = json.loads(job['payload'])
+            except Exception as e:
+                logger.error(f"Failed to parse payload for job {job['id']}: {e}")
+                return None
             
         return job