7 min read
Lolo Cab: three ways to ask a vendor's balance, three answers
Backend notes from Lolo Cab — money as an append-only ledger, the readers that disagreed with it, and the idempotency key that was already in the schema.
Tag
#mongodb
2 posts
All#astro#aws#concurrency#dev-notes#huggingface#kyc#lolo-cab#mongodb#nlp#nodejs#payments#process#python#react-native#security#seo#smart-trust-meter#sports-pregame#thegrindcalc
4 min read
Lolo Cab: shared-ride seats are a counter, and counters race
Backend notes from Lolo Cab — why check-then-decrement seat counts break under concurrent bookings, and the atomic-update fix.