feat(users): add user administration and password management

validation-suite/backend/mercury/app/services/auth_service.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+from datetime import UTC, datetime
+
 from fastapi import HTTPException, status
 from sqlalchemy.orm import Session
 
@@ -19,5 +21,6 @@ class AuthService:
                 detail="Invalid credentials",
                 headers={"WWW-Authenticate": "Bearer"},
             )
-        return create_access_token(user.id, user.role.value)
-
+        user.last_login_at = datetime.now(UTC)
+        self.users.session.commit()
+        return create_access_token(user.id, user.role)