fix: revert generate_formula param back to model_name

Keep original parameter name — model_name is the correct terminology
for this endpoint, not file_name.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: abhizipstack

backend/backend/core/routers/transformation/urls.py

@@ -21,6 +21,6 @@
     path("<str:file_name>/set-presentation", set_model_presentation, name="set-no-code-model-presentation"),
     path("<str:file_name>/columns", get_transformation_columns, name="get-transformation-columns"),
     path("<str:file_name>/supported_references", get_supported_models, name="get-supported-reference-models"),
-    path("<str:file_name>/generate_formula", generate_formula, name="generate-formula"),
+    path("<str:model_name>/generate_formula", generate_formula, name="generate-formula"),
     path("<str:file_name>", save_model_file, name="save-no-code-model-file"),
 ]

backend/backend/core/routers/transformation/views.py

@@ -211,13 +211,13 @@ def get_supported_models(request: Request, project_id: str, file_name: str) -> R
 @api_view([HTTPMethods.POST])
 @handle_http_request
 @handle_permission
-def generate_formula(request: Request, project_id: str, file_name: str) -> Response:
+def generate_formula(request: Request, project_id: str, model_name: str) -> Response:
     # Generate Excel Formula based on the User prompt with OpenAi support
     user_prompt = request.data["user_prompt"]
     app = FormulaContext(project_id=project_id)
 
     # Get schema details and construct the prompt
-    schema_details = app.get_schema_details(file_name)
+    schema_details = app.get_schema_details(model_name)
     constructed_prompt = app.construct_prompt(user_prompt, schema_details)
 
     # Generate the formula