USE msdb
GO

ALTER TABLE [dbo].[sysmaintplan_log] DROP CONSTRAINT [FK_sysmaintplan_log_subplan_id];
GO

ALTER TABLE [dbo].[sysmaintplan_logdetail] DROP CONSTRAINT [FK_sysmaintplan_log_detail_task_id];
GO

TRUNCATE TABLE msdb.dbo.sysmaintplan_logdetail;
GO

TRUNCATE TABLE msdb.dbo.sysmaintplan_log;
GO

ALTER TABLE [dbo].[sysmaintplan_log] WITH CHECK ADD CONSTRAINT [FK_sysmaintplan_log_subplan_id] FOREIGN KEY([subplan_id])
REFERENCES [dbo].[sysmaintplan_subplans] ([subplan_id]);
GO

ALTER TABLE [dbo].[sysmaintplan_logdetail] WITH CHECK ADD CONSTRAINT [FK_sysmaintplan_log_detail_task_id] FOREIGN KEY([task_detail_id])
REFERENCES [dbo].[sysmaintplan_log] ([task_detail_id]) ON DELETE CASCADE;
GO