feat(chat): 聊天单向删除

alembic/env.py

@@ -27,6 +27,30 @@ from core.db.models import BaseModel  # 假设你的 SQLAlchemy 模型在 models
 target_metadata = BaseModel.metadata
 
 
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
 def do_run_migrations(connection):
     context.configure(
         connection=connection,
@@ -62,4 +86,4 @@ else:
         asyncio.set_event_loop(loop)
 
     # 运行迁移
-    loop.run_until_complete(run_migrations_online())
+    loop.run_until_complete(run_migrations_online())