fix: Ensure feature layer is truncated at the start of script execution

- Moved the call to the truncate function to always execute at the beginning of the main function.
- Ensured that the feature layer is cleared before loading data from a JSON file or fetching from the API.

app.py

@@ -336,10 +336,12 @@ def main():
         fs = os.getenv('FS')
         layer = os.getenv('LAYER')
 
+        logger.info("Truncating the feature layer.")
+        truncate(token, hostname, instance, fs, layer)
+
         # If --reload flag is set, load data from the specified file
         if reload_file:
             logger.info(f"Reloading data from file: {reload_file}")
-            truncate(token, hostname, instance, fs, layer)  # Truncate the layer
 
             # Load data from the specified file
             with open(reload_file, 'r', encoding='utf-8') as f: