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What's a use-case for this? Is it like Neo4j or some other niche usecase (e.g mass surveillance graph, given the source)

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Yes, it's like Neo4j but based on the in-memory database LMDB, presumably to provide high performance running on a single machine.

The link mentions that its use case is streaming seed set expansion, which allows you to identify communities based on a set of seeds. I wrote more about that in this comment: https://news.ycombinator.com/item?id=17335873

Quibble: LMDB is a memory-mapped file database. It is not an in-memory database, although it generally outperforms all other in-memory databases.

Thanks, this is the first I had heard of LMDB.

I actually love the idea of a memory-mapped database, I've often thought memory mapping isn't taken advantage of enough.

It’s a graph database built on LMDB, so probably has the same use cases as you’d want to use LMDB in, but with some graph-y helpers.

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