WordPress database error: [Incorrect table definition; there can be only one auto column and it must be defined as a key]
ALTER TABLE wp_tm_tasks ADD COLUMN task_id bigint(20) NOT NULL auto_increment

WordPress database error: [Multiple primary key defined]
ALTER TABLE wp_tm_tasks ADD PRIMARY KEY (`task_id`)

WordPress database error: [Unknown column 'task_id' in 'wp_tm_tasks']
ALTER TABLE wp_tm_tasks CHANGE COLUMN `task_id` `id` INT NOT NULL

WordPress database error: [Duplicate column name 'attempts']
ALTER TABLE wp_tm_tasks ADD attempts INT DEFAULT 0 AFTER type

WordPress database error: [Duplicate column name 'class_identifier']
ALTER TABLE wp_tm_tasks ADD class_identifier varchar(300) DEFAULT 0 AFTER type

WordPress database error: [Duplicate column name 'last_locked_at']
ALTER TABLE wp_tm_tasks ADD last_locked_at BIGINT DEFAULT 0 AFTER time_created