26 lines
836 B
SQL
26 lines
836 B
SQL
-- Detach qt_configurations from qt_users (ownership is owner_username text)
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-- Safe for MySQL 8+/MariaDB 10.2+ via INFORMATION_SCHEMA checks.
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SET @fk_exists := (
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SELECT COUNT(*)
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FROM information_schema.TABLE_CONSTRAINTS
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WHERE CONSTRAINT_SCHEMA = DATABASE()
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AND TABLE_NAME = 'qt_configurations'
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AND CONSTRAINT_NAME = 'fk_qt_configurations_user'
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AND CONSTRAINT_TYPE = 'FOREIGN KEY'
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);
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SET @drop_fk_sql := IF(
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@fk_exists > 0,
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'ALTER TABLE qt_configurations DROP FOREIGN KEY fk_qt_configurations_user',
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'SELECT ''fk_qt_configurations_user not found, skip'' '
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);
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PREPARE stmt_drop_fk FROM @drop_fk_sql;
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EXECUTE stmt_drop_fk;
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DEALLOCATE PREPARE stmt_drop_fk;
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-- user_id becomes optional legacy column (can stay NULL)
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ALTER TABLE qt_configurations
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MODIFY COLUMN user_id BIGINT UNSIGNED NULL;
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