DELETE FROM message_attachments WHERE kind = 'sticker';

ALTER TABLE message_attachments DROP CONSTRAINT IF EXISTS message_attachments_kind_check;
ALTER TABLE message_attachments
    ADD CONSTRAINT message_attachments_kind_check
    CHECK (kind IN ('image', 'video', 'audio', 'file', 'link', 'entity', 'quote'));

ALTER TABLE message_attachments DROP CONSTRAINT IF EXISTS message_attachments_entity_type_check;
ALTER TABLE message_attachments
    ADD CONSTRAINT message_attachments_entity_type_check
    CHECK (entity_type IS NULL OR
           entity_type IN ('post', 'comment', 'profile', 'collection'));

DROP TABLE IF EXISTS saved_stickers;