fix: reset() only drops history table, leaving stale messages (#5541)

tests/memory/test_storage.py

@@ -280,3 +280,22 @@ class TestSQLiteManager:
         assert history[0]["actor_id"] is None
         assert history[0]["is_deleted"] is False
         mgr.close()
+
+    def test_reset_drops_tables(self, temp_db_path):
+        """reset() must drop both history and messages tables."""
+        mgr = SQLiteManager(temp_db_path)
+        mgr.add_history(memory_id="m1", old_memory=None, new_memory="new", event="ADD")
+        mgr.save_messages([{"role": "user", "content": "hello", "name": None}], "sess1")
+        mgr.reset()
+        tables = mgr.connection.execute(
+            "SELECT name FROM sqlite_master WHERE type='table' AND name IN ('history','messages')"
+        ).fetchall()
+        assert tables == [], "both tables should be dropped after reset"
+        mgr.close()
+
+        mgr2 = SQLiteManager(temp_db_path)
+        msg_count = mgr2.connection.execute("SELECT COUNT(*) FROM messages").fetchone()[0]
+        hist_count = mgr2.connection.execute("SELECT COUNT(*) FROM history").fetchone()[0]
+        assert msg_count == 0
+        assert hist_count == 0
+        mgr2.close()