SlackBuildsOrg/network/sqlrelay

With SQL Relay, you can speed up and enhance the scalability of
database-driven web-based applications, access databases from
unsupported platforms, throttle database access, distribute load
over clustered or replicated databases, route queries and migrate
applications from one database to another.

Two optional dependencies, postgresql and freetds will be auto
detected at build time, they can be found on SlackBuilds.org