fix: add logging to service update endpoint and improve error handling

- Log received scheduled_date and parsed value on PUT /service/update/{id}
- Wrap datetime.fromisoformat in try/except to return 400 on bad format
- Add db.refresh after commit to confirm persisted value in logs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

main.py

@@ -8,6 +8,7 @@ from config import load_config
 from sqlalchemy import create_engine, text
 from sqlalchemy.orm import sessionmaker
 
+# TODO: Consider using a more robust configuration management system
 from app.routers import service
 
 
@@ -90,6 +91,7 @@ app.add_middleware(
 
 @app.get("/")
 def health_check():
+    # TODO: Add more comprehensive health checks including DB status
     return {"ok": True, "service": "eamco_service"}