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We use a graph database at my company (OrientDB, having migrated from Neo4J). I don't really know what we need it for, aside from giving the graph database guy something fun to do. We also use Postgres as our main DB. As far as I can tell, we could implement our graph as standard Postgres tables, and it would work just fine if not better. Plus, there'd be more than one person who knows how to query it.

A handful of startups I've talked to have regretted their decision to host their application (or parts of their application) on a graph database. The ones who migrated away (to a traditional RDBMS) mentioned better tooling, higher stability, and faster performance as outcomes of their migration.

If you don't mind me asking why did you migrate from Neo4j to OrientDB?

Cost, I think.

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