fix(db): allow intentional deletion of all custom configs

src/api/app/routers/configs.py

@@ -411,7 +411,7 @@ def delete_configs(req: ConfigsDeleteRequest) -> JSONResponse:
         return JSONResponse(status_code=404, content={"status": "error", "message": "No deletable UI/API configs found among selection", "skipped": skipped})
 
     for method, keep in keep_by_method.items():
-        err = db.save_custom_configs(keep, method)
+        err = db.save_custom_configs(keep, method, allow_empty=True)
         if err:
             return JSONResponse(status_code=500, content={"status": "error", "message": err, "skipped": skipped})
 

src/common/db/Database.py

@@ -2386,6 +2386,7 @@ def save_custom_configs(
         changed: Optional[bool] = True,
         *,
         disable_cleanup: bool = False,
+        allow_empty: bool = False,
     ) -> str:
         """Save the custom configs in the database"""
         message = ""
@@ -2409,7 +2410,7 @@ def save_custom_configs(
                 # actions delete rows individually through the UI/API, so by the time
                 # an empty payload reaches save_custom_configs there is nothing left
                 # to wipe and this guard is a no-op.
-                if method in ("ui", "api") and not custom_configs:
+                if method in ("ui", "api") and not custom_configs and not allow_empty:
                     existing_count = session.query(Custom_configs).filter(Custom_configs.method == method).count()
                     if existing_count > 0:
                         self.logger.warning(

src/ui/app/routes/configs.py

@@ -414,7 +414,7 @@ def delete_configs(configs: Dict[str, str]):
             return
 
         for method, configs_for_method in remaining_configs_by_method.items():
-            error = DB.save_custom_configs(configs_for_method, method)
+            error = DB.save_custom_configs(configs_for_method, method, allow_empty=True)
             if error:
                 DATA["TO_FLASH"].append({"content": f"An error occurred while saving the custom configs: {error}", "type": "error"})
                 DATA.update({"RELOADING": False, "CONFIG_CHANGED": False})