Add chat_id column to the users table

db/migrations/init_tables.py

@@ -8,7 +8,7 @@ async def init_tables(connection: Connection):
     init_users_query = """
     CREATE TABLE users (
         user_id bigint PRIMARY KEY,
-        is_admin boolean DEFAULT FALSE
+        chat_id bigint
     );
     """
     await connection.execute(init_users_query)