Refactor: Extract common utilities to shared module

- Created calendar_sync_utils.py with shared functions:
  - log_operation: Centralized logging with context support
  - connect_db: Database connection wrapper
  - get_google_service: Google Calendar API initialization
- Updated imports in calendar_sync_event_step.py and audit_calendar_sync.py
- Removed duplicated function definitions
- Maintained function logic without changes
- Improved code maintainability and reduced duplications

bitbylaw/steps/advoware_cal_sync/audit_calendar_sync.py

@@ -7,6 +7,7 @@ import pytz
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..'))
 from config import Config
 from services.advoware import AdvowareAPI
+from .calendar_sync_utils import connect_db, get_google_service
 from googleapiclient.discovery import build
 from googleapiclient.errors import HttpError
 from google.oauth2 import service_account
@@ -23,35 +24,7 @@ BERLIN_TZ = pytz.timezone('Europe/Berlin')
 now = datetime.now(BERLIN_TZ)
 current_year = now.year
 
-async def connect_db():
-    """Connect to Postgres DB from Config."""
-    try:
-        conn = await asyncpg.connect(
-            host=Config.POSTGRES_HOST or 'localhost',
-            user=Config.POSTGRES_USER,
-            password=Config.POSTGRES_PASSWORD,
-            database=Config.POSTGRES_DB_NAME,
-            timeout=10
-        )
-        return conn
-    except Exception as e:
-        logger.error(f"Failed to connect to DB: {e}")
-        raise
 
-async def get_google_service():
-    """Initialize Google Calendar service."""
-    try:
-        service_account_path = Config.GOOGLE_CALENDAR_SERVICE_ACCOUNT_PATH
-        if not os.path.exists(service_account_path):
-            raise FileNotFoundError(f"Service account file not found: {service_account_path}")
-        creds = service_account.Credentials.from_service_account_file(
-            service_account_path, scopes=Config.GOOGLE_CALENDAR_SCOPES
-        )
-        service = build('calendar', 'v3', credentials=creds)
-        return service
-    except Exception as e:
-        logger.error(f"Failed to initialize Google service: {e}")
-        raise
 
 async def ensure_google_calendar(service, employee_kuerzel):
     """Ensure Google Calendar exists for employee."""