alter table report_automatic alter column report_name drop not null;

alter table report_automatic alter column report_start_time drop not null;

alter table report_automatic alter column report_end_time drop not null;

alter table report_automatic alter column factors drop not null;

alter table report_automatic alter column project_overview drop not null;

alter table report_automatic
	add cover_time timestamp;

alter table report_automatic
	add struct_list json;

alter table report_automatic drop column struct_id;

alter table report_automatic
	add struct_id integer[] not null;