ddon-server/Arrowgene.Ddon.Database/Files/Database/Script/migration_quest_variant_refactor.sql

ALTER TABLE "ddon_priority_quests"
    RENAME COLUMN "quest_id" to "quest_schedule_id";

ALTER TABLE "ddon_reward_box" 
    RENAME COLUMN "quest_id" to "quest_schedule_id";

ALTER TABLE "ddon_reward_box"
    DROP "variant_quest_id";

ALTER TABLE "ddon_quest_progress"
    RENAME COLUMN "quest_id" to "quest_schedule_id";

ALTER TABLE "ddon_quest_progress"
    DROP "variant_quest_id";