Quarantine issue with historian

Hello folks!

Ignition 8.1.3
Sql Server 2019

I have a big number of quanrantines items. Most of them because of “Violation of PRIMARY KEY constraint”.

Also, the buttons “Retry All” and “Delete All” are shaded…

So:
1- Why do I have all these quanrantine items?
2- What can I do to avoid that
3- Why are the buttons “Retry All” and “Delete All” are shaded?

Thanks a lot.