Update app.py

app.py

@@ -13,14 +13,14 @@ from plotting import (
 
 def load_data_in_chunks(file_path, selected_columns, start_date=None, end_date=None, chunksize=10000):
     # Load the entire header to get multi-level column names
-    header = pd.read_csv(file_path, nrows=0, header=[0, 1, 2])
+    header = pd.read_csv(file_path, nrows=0, header=[0, 1, 2], index_col=0)
     
     # Filter the required columns including datetime
     columns = [col for col in header.columns if col[2] in selected_columns]
     
     chunks = []
     for chunk in pd.read_csv(file_path, chunksize=chunksize, header=[0, 1, 2], index_col=0, parse_dates=True):
-        # Assign multi-level columns
+        # Assign multi-level columns (excluding the index)
         chunk.columns = header.columns
         
         # Filter the necessary columns
@@ -62,6 +62,11 @@ heatmap_temperature = pn.widgets.Checkbox(
 # Create a loading spinner
 loading_spinner = pn.indicators.LoadingSpinner(width=50, height=50)
 
+@pn.depends(
+    inverter_ids.param.value,
+    plot_power_curves.param.value,
+    plot_temperature_curves.param.value,
+)
 @pn.depends(
     inverter_ids.param.value,
     plot_power_curves.param.value,