feat: complete T-534 generated reset enhancements

tests/test_ai.py

@@ -802,6 +802,51 @@ class AITests(TempDirMixin, unittest.TestCase):
 
         self.assert_removed(temp_dir)
 
+    def test_generate_batch_fills_reset_cover_after_committed_history(self):
+        with self.make_temp_dir() as temp_dir:
+            cfg = self._config()
+            cfg["db_path"] = os.path.join(temp_dir, "cmshopee.db")
+            cfg["image_dir"] = os.path.join(temp_dir, "images")
+            cfg["ai"]["generate_cover"] = True
+            batch_id, tasks = self._collected_tasks(temp_dir, cfg, ["旧标题"])
+            db.set_generated(tasks[0].id, "手动标题", "old-new.jpg", path=cfg["db_path"])
+            db.set_applied(tasks[0].id, True, path=cfg["db_path"])
+            db.reset_generated(
+                tasks[0].id,
+                reset_title=False,
+                reset_cover=True,
+                path=cfg["db_path"],
+            )
+            cover_only_task = db.list_tasks(batch_id=batch_id, path=cfg["db_path"])[0]
+
+            def fake_cover(cover_prompt, old_cover_path, out_path, **kwargs):
+                os.makedirs(os.path.dirname(out_path), exist_ok=True)
+                with open(out_path, "wb") as fh:
+                    fh.write(b"jpeg")
+                return out_path
+
+            with mock.patch("app.ai.gen_title") as gen_title, \
+                    mock.patch("app.ai.gen_cover", side_effect=fake_cover) as gen_cover:
+                summary = ai.generate_batch(
+                    [cover_only_task],
+                    {"title": "标题提示", "cover": "封面 {新标题}"},
+                    ai_cfg={"config": cfg, "db_path": cfg["db_path"]},
+                )
+
+            self.assertTrue(summary["ok"])
+            self.assertEqual(1, summary["total"])
+            self.assertEqual(0, summary["title_total"])
+            self.assertEqual(1, summary["cover_total"])
+            gen_title.assert_not_called()
+            gen_cover.assert_called_once()
+            updated = db.list_tasks(batch_id=batch_id, path=cfg["db_path"])[0]
+            self.assertEqual("手动标题", updated.new_title)
+            self.assertTrue(os.path.exists(updated.new_cover_path))
+            self.assertEqual(1, updated.committed)
+            self.assertEqual(1, updated.apply_attempts)
+
+        self.assert_removed(temp_dir)
+
     def test_generate_batch_handles_mixed_title_and_cover_gaps(self):
         with self.make_temp_dir() as temp_dir:
             cfg = self._config()