Would you mind sharing how you used this for graphs? What usecase(s) you had?

There was a Show HN yesterday about "Graph Processing with Postgres and GraphBLAS"

> https://news.ycombinator.com/item?id=19379800

Was your usecase similar and could ArangoDB be subbed for psql in the above linked project?

I also feel managed service is quite critical offering they're missing right now. Considering recent AWS and Elastic debacle, market is going to be tough for Open Source products like ArangoDB.