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by grey-area 2903 days ago
I'd definitely vote for PostgreSQL, it can handle large loads effortlessly, it's reliable, and yet they keep adding great features.

It could also function pretty much like a nosql db initially, to ease your transition, then you could migrate gradually to using it as a relational db. You need strong checks on data integrity before you start - you could consider double writing (to old orm using nosql + new orm using psql), and comparing data stored to be sure you don't miss anything at first, before you switch?