Added lag_y

main.py

@@ -105,6 +105,7 @@ async def modelfit_file(
     time_col: str = Form(...),
     y: str = Form(...),
     # optional knobs
+    lag_y: str = Form(""),
     lagged_features: str = Form(""),          # JSON string or empty
     current_features: str = Form(""),         # "all" | JSON string | ""
     filter_by_significance: str = Form("false"),
@@ -121,6 +122,7 @@ async def modelfit_file(
         "id_col": id_col,
         "time_col": time_col,
         "y": y,
+        "lag_y": lag_y,
         "lagged_features": lagged_features,
         "current_features": current_features,
         "filter_by_significance": filter_by_significance,