DROP INDEX IF EXISTS idx_image_exif_duplicate_of_hash;
DROP INDEX IF EXISTS idx_image_exif_dhash;
DROP INDEX IF EXISTS idx_image_exif_phash;

ALTER TABLE image_exif DROP COLUMN duplicate_decided_at;
ALTER TABLE image_exif DROP COLUMN duplicate_of_hash;
ALTER TABLE image_exif DROP COLUMN dhash_64;
ALTER TABLE image_exif DROP COLUMN phash_64;