M8: add operational authentication mode

backend/app/api/deps.py

@@ -8,6 +8,7 @@ from sqlalchemy.orm import Session
 from app.core.config import get_settings
 from app.core.db import SessionLocal
 from app.core.security import SessionPayload, read_session_token
+from app.models.user import User
 from app.schemas import CurrentUser, Role
 
 settings = get_settings()
@@ -22,13 +23,21 @@ def get_db() -> Generator[Session, None, None]:
         db.close()
 
 
-def get_current_user(request: Request) -> CurrentUser:
+def get_current_user(request: Request, db: Session = Depends(get_db)) -> CurrentUser:
     token = request.cookies.get(settings.session_cookie_name)
     payload: SessionPayload | None = read_session_token(token) if token else None
     if payload is None or payload.role not in _VALID_ROLES:
         raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated")
-    role: Role = payload.role  # type: ignore[assignment]
-    return CurrentUser(public_ref=payload.public_ref, display_name=payload.display_name, role=role)
+    user = db.get(User, payload.user_id)
+    if (
+        user is None
+        or not user.active
+        or user.public_ref != payload.public_ref
+        or user.role not in _VALID_ROLES
+    ):
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated")
+    role: Role = user.role  # type: ignore[assignment]
+    return CurrentUser(public_ref=user.public_ref, display_name=user.display_name, role=role)
 
 
 def require_operations_manager(