ALTER TABLE `media_files`
    ADD COLUMN IF NOT EXISTS `excerpt_start_seconds` DECIMAL(8,3) NOT NULL DEFAULT 0.000 AFTER `trim_end_seconds`,
    ADD COLUMN IF NOT EXISTS `excerpt_end_seconds` DECIMAL(8,3) NULL DEFAULT NULL AFTER `excerpt_start_seconds`,
    ADD COLUMN IF NOT EXISTS `playback_speed` DECIMAL(5,3) NOT NULL DEFAULT 1.000 AFTER `fade_out_seconds`,
    ADD COLUMN IF NOT EXISTS `intro_seconds` DECIMAL(8,3) NOT NULL DEFAULT 0.000 AFTER `playback_speed`;
