[D]: Do you use “source of truth” databases for your DL and/or AI/ML applications? If so, for what?

Models of various kinds and vector databases are common in applications of "AI" (sorry if that term is triggering -- it's appropriately ambiguous). But there are times when you not only need to store your raw application data in a "source of truth" (usually ACID-compliant RDBMS), but also ought to use the source of truth for the date related to learning, itself.

Do you all use databases like this for things like:

- Training/testing job metadata storage
- Loss
- …

application application data applications data databases machinelearning ml applications raw vector vector databases