Harden admin users endpoint fallback on partial schemas

app/auth/backend/admin.py

@@ -37,6 +37,20 @@ def _users_column_exists(column_name: str) -> bool:
     return bool(result)
 
 
+def _table_exists(table_name: str) -> bool:
+        result = execute_query_single(
+                """
+                SELECT 1
+                FROM information_schema.tables
+                WHERE table_schema = 'public'
+                    AND table_name = %s
+                LIMIT 1
+                """,
+                (table_name,)
+        )
+        return bool(result)
+
+
 @router.get("/admin/users", dependencies=[Depends(require_permission("users.manage"))])
 async def list_users():
     is_2fa_expr = "u.is_2fa_enabled" if _users_column_exists("is_2fa_enabled") else "FALSE AS is_2fa_enabled"
@@ -45,6 +59,15 @@ async def list_users():
     telefoni_ip_expr = "u.telefoni_phone_ip" if _users_column_exists("telefoni_phone_ip") else "NULL::varchar AS telefoni_phone_ip"
     telefoni_username_expr = "u.telefoni_phone_username" if _users_column_exists("telefoni_phone_username") else "NULL::varchar AS telefoni_phone_username"
     last_login_expr = "u.last_login_at" if _users_column_exists("last_login_at") else "NULL::timestamp AS last_login_at"
+    has_user_groups = _table_exists("user_groups")
+    has_groups = _table_exists("groups")
+
+    if has_user_groups and has_groups:
+        groups_join = "LEFT JOIN user_groups ug ON u.user_id = ug.user_id LEFT JOIN groups g ON ug.group_id = g.id"
+        groups_select = "COALESCE(array_remove(array_agg(g.name), NULL), ARRAY[]::varchar[]) AS groups"
+    else:
+        groups_join = ""
+        groups_select = "ARRAY[]::varchar[] AS groups"
 
     try:
         users = execute_query(
@@ -53,18 +76,32 @@ async def list_users():
                  u.is_active, u.is_superadmin, {is_2fa_expr},
                  {telefoni_extension_expr}, {telefoni_active_expr}, {telefoni_ip_expr}, {telefoni_username_expr},
                  u.created_at, {last_login_expr},
-                 COALESCE(array_remove(array_agg(g.name), NULL), ARRAY[]::varchar[]) AS groups
+                 {groups_select}
             FROM users u
-            LEFT JOIN user_groups ug ON u.user_id = ug.user_id
+            {groups_join}
-            LEFT JOIN groups g ON ug.group_id = g.id
             GROUP BY u.user_id
             ORDER BY u.user_id
             """
         )
         return users
     except Exception as exc:
-        logger.error("❌ Failed to load admin users: %s", exc)
+        logger.warning("⚠️ Admin user query fallback triggered: %s", exc)
-        raise HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail="Could not load users") from exc
+        try:
+            users = execute_query(
+                f"""
+                SELECT u.user_id, u.username, u.email, u.full_name,
+                       u.is_active, u.is_superadmin, {is_2fa_expr},
+                       {telefoni_extension_expr}, {telefoni_active_expr}, {telefoni_ip_expr}, {telefoni_username_expr},
+                       u.created_at, {last_login_expr},
+                       ARRAY[]::varchar[] AS groups
+                FROM users u
+                ORDER BY u.user_id
+                """
+            )
+            return users
+        except Exception as fallback_exc:
+            logger.error("❌ Failed to load admin users (fallback): %s", fallback_exc)
+            raise HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail="Could not load users") from fallback_exc
 
 
 @router.post("/admin/users", status_code=status.HTTP_201_CREATED, dependencies=[Depends(require_permission("users.manage"))])