WordPress 数据库错误： [Incorrect prefix key; the used key part isn't a string, the used length is longer than the key part, or the storage engine doesn't support unique prefix keys]
CREATE TABLE rvfd99wqq_acg_danmu_activity ( id mediumint(9) NOT NULL AUTO_INCREMENT, user_id mediumint(9) NOT NULL, username varchar(50) NOT NULL, action_type varchar(20) NOT NULL, post_id mediumint(9) NULL, post_title varchar(200) NULL, created_at datetime DEFAULT CURRENT_TIMESTAMP NOT NULL, PRIMARY KEY (id), UNIQUE KEY user_post_action_unique (user_id, post_id, action_type, created_at(10)) ) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci