fix rates init

api/database.py

@@ -81,7 +81,7 @@ def initialize_db() -> None:
         # Use JSON string for array values
         cursor.execute(
             "INSERT OR REPLACE INTO settings (name, value) VALUES (?, ?)",
-            ("rate_options", json.dumps(["half_hour", "hour"])),
+            ("rate_options", "half_hour,hour"),
         )
 
         conn.commit()