6 There's nothing you can do to find the list except ask or pick them up from posts/slide decks/etc. The list only exists in the code, in a header file where the valid trace flag numbers are mapped to names in a big enum in the C++ code, and then the names are used in the rest of the code.
4 This is a bit messy to get the final result because you have multiple `SCHEMA_VER` for each date. Before I demonstrate how to do this with dynamic SQL, I'll first show how to do it with static code to get the logic correct. In order to get the final result you can utilize both pivot and unpivot.
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Understanding CleanupTime in Ola Hallengren's SQL Server scripts in relation to FULL backups and LOG backups