-- 非付费互动支持 deviceId 归属；登录时由应用事务合并到账号。

ALTER TABLE content_like
    ADD COLUMN IF NOT EXISTS device_id VARCHAR(128) NOT NULL DEFAULT '';
ALTER TABLE content_like
    ALTER COLUMN user_id DROP NOT NULL;
DROP INDEX IF EXISTS uk_content_like;
CREATE UNIQUE INDEX IF NOT EXISTS uk_content_like_user
    ON content_like (user_id, target_type, target_id)
    WHERE user_id IS NOT NULL;
CREATE UNIQUE INDEX IF NOT EXISTS uk_content_like_device
    ON content_like (device_id, target_type, target_id)
    WHERE user_id IS NULL AND device_id <> '';
CREATE INDEX IF NOT EXISTS idx_content_like_device
    ON content_like (device_id, created_at DESC)
    WHERE device_id <> '';

ALTER TABLE user_favorite
    ADD COLUMN IF NOT EXISTS device_id VARCHAR(128) NOT NULL DEFAULT '';
ALTER TABLE user_favorite
    ALTER COLUMN user_id DROP NOT NULL;
DROP INDEX IF EXISTS uk_user_favorite;
CREATE UNIQUE INDEX IF NOT EXISTS uk_user_favorite_user
    ON user_favorite (user_id, drama_id)
    WHERE user_id IS NOT NULL;
CREATE UNIQUE INDEX IF NOT EXISTS uk_user_favorite_device
    ON user_favorite (device_id, drama_id)
    WHERE user_id IS NULL AND device_id <> '';
CREATE INDEX IF NOT EXISTS idx_user_favorite_device
    ON user_favorite (device_id, created_at DESC)
    WHERE device_id <> '';

ALTER TABLE content_comment
    ADD COLUMN IF NOT EXISTS device_id VARCHAR(128) NOT NULL DEFAULT '';
ALTER TABLE content_comment
    ALTER COLUMN user_id DROP NOT NULL;
CREATE INDEX IF NOT EXISTS idx_comment_device
    ON content_comment (device_id, created_at DESC)
    WHERE user_id IS NULL AND device_id <> '';
CREATE UNIQUE INDEX IF NOT EXISTS uk_content_comment_user_content
    ON content_comment (
        user_id,
        drama_id,
        episode_id,
        parent_id,
        md5(content)
    )
    WHERE user_id IS NOT NULL AND deleted = 0 AND status <> 'deleted';
CREATE UNIQUE INDEX IF NOT EXISTS uk_content_comment_device_content
    ON content_comment (
        device_id,
        drama_id,
        episode_id,
        parent_id,
        md5(content)
    )
    WHERE user_id IS NULL AND device_id <> '' AND deleted = 0 AND status <> 'deleted';