forrestii/fpcentral still has stretch packages (mongodb)

fpcentral requires mongodb to operate, but that package was removed from Debian stable in february 2019, mainly because of license problems. to quote wikipedia:

MongoDB has been dropped from the Debian, Fedora and Red Hat Enterprise Linux distributions due to the licensing change. Fedora determined that the SSPL version 1 is not a free software license because it is "intentionally crafted to be aggressively discriminatory" towards commercial users.

(there is also an unpatched security issue against mongodb, by the way...)

we can't maintain this service like that in the long term. stretch will stop being supported this summer and mongodb isn't supported in its free form.

what's the plan for replacing mongodb?