CREATE TABLE IF NOT EXISTS `{{prefix}}_request_revisions` (
  `id` INT UNSIGNED NOT NULL AUTO_INCREMENT,
  `request_id` SMALLINT UNSIGNED NOT NULL DEFAULT 0,
  `action` VARCHAR(32) NOT NULL DEFAULT 'update',
  `snapshot_hash` CHAR(40) NOT NULL DEFAULT '',
  `snapshot_json` LONGTEXT NOT NULL,
  `comment` VARCHAR(255) NOT NULL DEFAULT '',
  `author_id` INT UNSIGNED NOT NULL DEFAULT 0,
  `author_name` VARCHAR(255) NOT NULL DEFAULT '',
  `source_revision_id` INT UNSIGNED NOT NULL DEFAULT 0,
  `created_at` INT UNSIGNED NOT NULL DEFAULT 0,
  PRIMARY KEY (`id`),
  KEY `idx_request_created` (`request_id`,`created_at`),
  KEY `idx_snapshot_hash` (`snapshot_hash`)
) ENGINE=InnoDB ROW_FORMAT=DYNAMIC DEFAULT CHARSET=utf8mb4;