The oldest db I have on media catalog is dated March 2011:
In the beginning I did very little with it and used it mostly for conversions. I can't rely on dates of the earliest books in my main db because some have obviously innacurate timestamps like January 2003 and July 2001 (those are dated prior to libprs500 conception!) Then I have a more steady sequence of titles dated from May 2009 onwards, but I believe timestamps should be correct starting from September 2010. Earliest Id is 3 from 2016 but that's dated after my second earliest Id, which is 49 from September 2012, lol.
Big thanks for the question because I thought this catalog wasn't easily accessible as I have yet to consolidate many old hard drives, and I just found where to look for some data I've been missing.