fix: use async callable for asyncpg pool init instead of string

worker/src/db.py

@@ -7,6 +7,10 @@ logger = logging.getLogger(__name__)
 _pool: asyncpg.Pool | None = None
 
 
+async def _init_connection(conn: asyncpg.Connection) -> None:
+    await conn.execute("SET search_path TO willhaben_tracker")
+
+
 async def get_pool() -> asyncpg.Pool:
     global _pool
     if _pool is None:
@@ -18,7 +22,7 @@ async def get_pool() -> asyncpg.Pool:
             database=os.getenv("POSTGRES_DB", "postgres"),
             min_size=2,
             max_size=10,
-            init="SET search_path TO willhaben_tracker"
+            init=_init_connection
         )
         logger.info("Database pool initialized")
     return _pool