refactor: Centralize database session management in a shared dependency module

tests/unit/conftest.py

@@ -57,38 +57,11 @@ def api_client(db_session: Session) -> Generator[TestClient, None, None]:
         finally:
             pass
 
-    # override all routers that use get_db
-    from routes import (
-        consumption,
-        costs,
-        distributions,
-        equipment,
-        maintenance,
-        parameters,
-        production,
-        reporting,
-        scenarios,
-        simulations,
-    )
+    from routes import dependencies as route_dependencies
 
-    overrides = {
-        consumption.get_db: override_get_db,
-        costs.get_db: override_get_db,
-        distributions.get_db: override_get_db,
-        equipment.get_db: override_get_db,
-        maintenance.get_db: override_get_db,
-        parameters.get_db: override_get_db,
-        production.get_db: override_get_db,
-        reporting.get_db: override_get_db,
-        scenarios.get_db: override_get_db,
-        simulations.get_db: override_get_db,
-    }
-
-    for dependency, override in overrides.items():
-        app.dependency_overrides[dependency] = override
+    app.dependency_overrides[route_dependencies.get_db] = override_get_db
 
     with TestClient(app) as client:
         yield client
 
-    for dependency in overrides:
-        app.dependency_overrides.pop(dependency, None)
+    app.dependency_overrides.pop(route_dependencies.get_db, None)