Migration guide

ALTER TABLE callback_content RENAME COLUMN update_date TO updated_at; ALTER TABLE telegram_chat RENAME COLUMN update_date TO updated_at; ALTER TABLE telegram_chat RENAME COLUMN create_date TO created_at; ALTER TABLE telegram_chat_status_event ALTER COLUMN title DROP NOT NULL; ALTER TABLE telegram_chat_status_event RENAME COLUMN create_date TO created_at; ALTER TABLE telegram_message ALTER COLUMN from_id DROP NOT NULL; ALTER TABLE telegram_message RENAME COLUMN create_date TO created_at; ALTER TABLE telegram_user RENAME COLUMN update_date TO updated_at; ALTER TABLE telegram_user RENAME COLUMN create_date TO created_at;