fix(test): use sync sessions in database tests to match production code

The database classes (BangumiDatabase, TorrentDatabase, RSSDatabase) use
synchronous Session, but tests were incorrectly using AsyncSession with
await calls, causing AttributeError on coroutine objects.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

backend/src/test/test_database.py

@@ -1,33 +1,24 @@
 import pytest
-from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
-from sqlalchemy.orm import sessionmaker
-from sqlmodel import SQLModel
+from sqlmodel import Session, SQLModel, create_engine
 
 from module.database.bangumi import BangumiDatabase
 from module.database.rss import RSSDatabase
 from module.database.torrent import TorrentDatabase
 from module.models import Bangumi, RSSItem, Torrent
 
-# sqlite async mock engine
-engine = create_async_engine(
-    "sqlite+aiosqlite://",
-    echo=False,
-)
-async_session_factory = sessionmaker(engine, class_=AsyncSession, expire_on_commit=False)
+# sqlite sync engine for testing
+engine = create_engine("sqlite://", echo=False)
 
 
 @pytest.fixture
-async def db_session():
-    async with engine.begin() as conn:
-        await conn.run_sync(SQLModel.metadata.create_all)
-    async with async_session_factory() as session:
+def db_session():
+    SQLModel.metadata.create_all(engine)
+    with Session(engine) as session:
         yield session
-    async with engine.begin() as conn:
-        await conn.run_sync(SQLModel.metadata.drop_all)
+    SQLModel.metadata.drop_all(engine)
 
 
-@pytest.mark.asyncio
-async def test_bangumi_database(db_session):
+def test_bangumi_database(db_session):
     test_data = Bangumi(
         official_title="无职转生，到了异世界就拿出真本事",
         year="2021",
@@ -51,34 +42,33 @@ async def test_bangumi_database(db_session):
     db = BangumiDatabase(db_session)
 
     # insert
-    await db.add(test_data)
-    result = await db.search_id(1)
+    db.add(test_data)
+    result = db.search_id(1)
     assert result.official_title == test_data.official_title
 
     # update
     test_data.official_title = "无职转生，到了异世界就拿出真本事II"
-    await db.update(test_data)
-    result = await db.search_id(1)
+    db.update(test_data)
+    result = db.search_id(1)
     assert result.official_title == test_data.official_title
 
     # search poster
-    poster = await db.match_poster("无职转生，到了异世界就拿出真本事II (2021)")
+    poster = db.match_poster("无职转生，到了异世界就拿出真本事II (2021)")
     assert poster == "/test/test.jpg"
 
     # match torrent
-    result = await db.match_torrent(
+    result = db.match_torrent(
         "[Lilith-Raws] 无职转生，到了异世界就拿出真本事 / Mushoku Tensei - 11 [Baha][WEB-DL][1080p][AVC AAC][CHT][MP4]"
     )
     assert result.official_title == "无职转生，到了异世界就拿出真本事II"
 
     # delete
-    await db.delete_one(1)
-    result = await db.search_id(1)
+    db.delete_one(1)
+    result = db.search_id(1)
     assert result is None
 
 
-@pytest.mark.asyncio
-async def test_torrent_database(db_session):
+def test_torrent_database(db_session):
     test_data = Torrent(
         name="[Sub Group]test S02 01 [720p].mkv",
         url="https://test.com/test.mkv",
@@ -86,22 +76,21 @@ async def test_torrent_database(db_session):
     db = TorrentDatabase(db_session)
 
     # insert
-    await db.add(test_data)
-    result = await db.search(1)
+    db.add(test_data)
+    result = db.search(1)
     assert result.name == test_data.name
 
     # update
     test_data.downloaded = True
-    await db.update(test_data)
-    result = await db.search(1)
+    db.update(test_data)
+    result = db.search(1)
     assert result.downloaded == True
 
 
-@pytest.mark.asyncio
-async def test_rss_database(db_session):
+def test_rss_database(db_session):
     rss_url = "https://test.com/test.xml"
     db = RSSDatabase(db_session)
 
-    await db.add(RSSItem(url=rss_url, name="Test RSS"))
-    result = await db.search_id(1)
+    db.add(RSSItem(url=rss_url, name="Test RSS"))
+    result = db.search_id(1)
     assert result.url == rss_url