For posterity, here is a python importer for tlpdb:

https://github.com/amaxwell/tlutility/blob/master/parse_tlpdb.py

(Thanks to Henkjan for sharing this.)

Jelle, did you work on the importer any further after FOSDEM?
Can you share the file, I'm afraid I lost the link :p

-- 
Pierre Neidhardt
https://ambrevar.xyz/