Extract duplicated DATABASE_URL parsing to database.py

- Added ASYNCPG_DATABASE_URL constant in database.py
- Updated jobs.py to import from database module
- Updated worker.py to import from database module
- Removed duplicate URL parsing logic from both files

backend/jobs.py

@@ -1,20 +1,15 @@
 """Job definitions and enqueueing utilities using pgqueuer."""
 
 import json
-import os
 
 import asyncpg
 from pgqueuer.queries import Queries
 
+from database import ASYNCPG_DATABASE_URL
+
 # Job type constants
 JOB_RANDOM_NUMBER = "random_number"
 
-# SQLAlchemy uses postgresql+asyncpg://, but asyncpg needs postgresql://
-_raw_url = os.getenv(
-    "DATABASE_URL", "postgresql+asyncpg://postgres:postgres@localhost:5432/arbret"
-)
-DATABASE_URL = _raw_url.replace("postgresql+asyncpg://", "postgresql://")
-
 # Connection pool for job enqueueing (lazy initialized)
 _pool: asyncpg.Pool | None = None
 
@@ -23,7 +18,7 @@ async def get_job_pool() -> asyncpg.Pool:
     """Get or create the connection pool for job enqueueing."""
     global _pool
     if _pool is None:
-        _pool = await asyncpg.create_pool(DATABASE_URL, min_size=1, max_size=5)
+        _pool = await asyncpg.create_pool(ASYNCPG_DATABASE_URL, min_size=1, max_size=5)
     return _pool