team/server/channels/db/migrations/mysql/000048_create_oauth_apps.down.sql

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'OAuthApps'
        AND table_schema = DATABASE()
        AND column_name = 'IconURL'
    ) > 0,
    'ALTER TABLE OAuthApps DROP COLUMN IconURL;',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

SET @preparedStatement = (SELECT IF(
    (
        SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
        WHERE table_name = 'OAuthApps'
        AND table_schema = DATABASE()
        AND column_name = 'IsTrusted'
    ) > 0,
    'ALTER TABLE OAuthApps DROP COLUMN IsTrusted;',
    'SELECT 1'
));

PREPARE alterIfExists FROM @preparedStatement;
EXECUTE alterIfExists;
DEALLOCATE PREPARE alterIfExists;

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

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

DROP TABLE IF EXISTS OAuthApps;