improve deletion and update end status

[dongdongyang33]

Signed-off-by: wuqinxuan [email protected]

What type of PR is this?

• [ ] API-change
• [ ] BUG
• [x] Improvement
• [ ] Documentation
• [ ] Feature
• [ ] Test and CI
• [ ] Code Refactoring

Which issue(s) this PR fixes:

issue #

What this PR does / why we need it:

[dongdongyang33]

Is there a doc/comment on what the return value true/false means?

no unified doc for it now. I add a comment for the return value