pickle -> sqlite store: D6 async writes, D9 reload race, one-shot pickle migration

tests/test_ai.py

@@ -1,6 +1,3 @@
-import os
-import pickle
-import tempfile
 import unittest
 from unittest.mock import Mock, patch
 
@@ -147,7 +144,6 @@ You always try to say something positive about the current day and the Fjærkroa
     def test_update_history(self) -> None:
         updater = self.bot.airesponder
         updater.history = []
-        updater.history_file = None
 
         question = {"content": '{"channel": "test_channel", "message": "What is the meaning of life?"}'}
         answer = {"content": '{"channel": "test_channel", "message": "42"}'}
@@ -179,15 +175,7 @@ You always try to say something positive about the current day and the Fjærkroa
         next_answer2 = {"content": '{"channel": "other_channel", "message": "Tripple Z"}'}
         updater.update_history(next_question2, next_answer2, 4)
         self.assertEqual(updater.history, [new_answer, next_answer, next_question2, next_answer2])
-
-        # Test case 5: Check history file save using mock
-        with unittest.mock.patch("builtins.open", unittest.mock.mock_open()) as mock_file:
-            _, temp_path = tempfile.mkstemp()
-            os.remove(temp_path)
-            self.bot.airesponder.history_file = temp_path
-            updater.update_history(question, answer, 2)
-            mock_file.assert_called_with(temp_path, "wb")
-            mock_file().write.assert_called_with(pickle.dumps([question, answer]))
+        # File persistence moved to the SQLite store — covered by PER-01 (SPEC-009)
 
 
 if __name__ == "__mait__":