HSQL
HSQL is a database interface [1] with backends to Postgres, MySQL, SQLite and ODBC. It is the only Haskell database interface with native MySQL driver.
HSQL was not updated since April 9, 2007 and the Hackage release does not build with GHC 8.3; it should be patched.
HSQL is looking for a maintainer (if you are the maintainer, please correct this).
Patching
Patching HSQL to work with recent GHC and Cabal versions is a standard process described in Upgrading packages.
If you have patched HSQL please provide links here.