refactor(db): use record id for account deletion

Update the delete query in delete_account to identify records by their
unique id and userID instead of filtering by username and stream.

ktvmanager/lib/database.py

@@ -237,8 +237,8 @@ def delete_account(user_id: int) -> Response:
         A Flask JSON response confirming the account was deleted.
     """
     data = request.form
-    query = "DELETE FROM userAccounts WHERE username = %s AND stream = %s AND userId = %s"
-    params = (data["user"], data["stream"], user_id)
+    query = "DELETE FROM userAccounts WHERE id = %s AND userID = %s"
+    params = (data["id"], user_id)
     result = _execute_query(query, params)
     return jsonify(result)