@bmalkow - could you add estimate and set due-date?

I've tried to test this as I've added a missing implementation for MongoDB. It looks like it does not work correctly, as I've added TTS-NG test cases for that and they failed. I've fixed a few minor bugs in the database schema and repository initialization but it is still failing.

I would start by looking into schema files, as from my tests it looks like avatar_hash field is too small (22 chars for 20 bytes of data encoded in HEX). Please also verify if MUC-ACS will work properly, as it may have wrong avatar hash on other cluster nodes and there is no refresh called from your code.