Show HN: Gamebody, a full-body game controller 3 years ago
Wait, can you now do QWOP with real human body parts as input and ... finally run? that would be so full circle!
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berendka
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Nested Sets
https://en.wikipedia.org/wiki/Nested_set_model
You can ust to store tree structures in relational databases for faster querying stuff like "all nodes below node x", "How many nodes to the top node" and so on.
Querying is easy, but comes at the cost that changes like inserting and deleting are more expensive.
I used this for an auth service with roles, user and org units. pretty query heavy, worked very well.