team/server/channels/db/migrations/mysql/000080_posts_createat_id.down.sql

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.STATISTICS
        WHERE table_name = 'Posts'
        AND table_schema = DATABASE()
        AND index_name = 'idx_posts_create_at_id'
    ) > 0,
    'DROP INDEX idx_posts_create_at_id on Posts;',
    'SELECT 1;'
));

PREPARE removeIndexIfExists FROM @preparedStatement;
EXECUTE removeIndexIfExists;
DEALLOCATE PREPARE removeIndexIfExists;