When running the Validate on a Database that has been crashing sometimes. I received a message that "Tag not found in structural CDX for Table "Enforce"
I opened the database and enforce exclusively and added the index and rebuilt the indexes. then ran cleanup and then re-validated the database. After doing that I have that the index is missing from the DBC. How to I rebuild the DBC or fix it?

This is a large database with over 2000 object.

There are 4 Index errors, and 1 message that "table is not in a database"