style: 统一 Ruff 代码格式

web/backend/database.py

@@ -32,7 +32,9 @@ def _get_database_url() -> str:
         db_user = os.getenv("DB_USER", "douyu_login").strip()
         db_password = os.getenv("DB_PASSWORD", "")
         if not db_name or not db_user or not db_password:
-            raise RuntimeError("使用 DB_HOST 时必须同时设置 DB_NAME、DB_USER 和 DB_PASSWORD")
+            raise RuntimeError(
+                "使用 DB_HOST 时必须同时设置 DB_NAME、DB_USER 和 DB_PASSWORD"
+            )
         return (
             f"mysql+pymysql://{quote_plus(db_user)}:{quote_plus(db_password)}"
             f"@{db_host}:{db_port}/{db_name}?charset=utf8mb4"
@@ -69,6 +71,7 @@ engine = create_engine(DATABASE_URL, **engine_options)
 
 
 if DATABASE_URL.startswith("sqlite"):
+
     @event.listens_for(engine, "connect")
     def _set_sqlite_pragmas(dbapi_connection, connection_record):
         """提升 SQLite 并发写入稳定性。"""
@@ -78,6 +81,7 @@ if DATABASE_URL.startswith("sqlite"):
         cursor.execute("PRAGMA foreign_keys=ON")
         cursor.close()
 
+
 SessionLocal = sessionmaker(bind=engine, autocommit=False, autoflush=False)
 Base = declarative_base()
 
@@ -104,7 +108,9 @@ def run_migrations():
     from alembic.config import Config
 
     config = Config(str(PROJECT_ROOT / "alembic.ini"))
-    config.set_main_option("script_location", str(PROJECT_ROOT / "web" / "backend" / "migrations"))
+    config.set_main_option(
+        "script_location", str(PROJECT_ROOT / "web" / "backend" / "migrations")
+    )
     config.set_main_option("sqlalchemy.url", DATABASE_URL)
     # 标记为应用内嵌调用，env.py 据此跳过 fileConfig，避免覆盖 uvicorn 日志配置。
     os.environ["ALEMBIC_EMBEDDED"] = "1"