POSTGRES AS A GRAPH DATABASE: (AB)USING PGROUTING

Summary from the TLDR Web Dev newsletter

The pgRouting Postgres extension can be used to add graph functionality to Postgres databases. While it's usually used for geospatial routing, it can also be used for non-GIS use cases, such as task scheduling using dependencies to find the critical path, reverse proxy routing based on resource allocation, and building recommendation engines like YouTube's.