refactor: Migrate file-based data storage to database

core/utils.py

@@ -129,11 +129,8 @@ def load_json(path):
     return json.load(open(path, 'r')) if os.path.exists(path) else None
 
 def create_default_personas():
+    # Persona data is now stored in the Persona DB table; ensure the directory exists for sample files.
     if not os.path.exists(config.PERSONAS_DIR): os.makedirs(config.PERSONAS_DIR)
-    if not os.path.exists(config.PERSONAS_FILE):
-        try:
-            with open(config.PERSONAS_FILE, 'w') as f: json.dump({}, f, indent=2)
-        except: pass
 
 def get_length_presets():
     presets = {}