Day 23

Today, I:

• wrote Lost Updates in a Rails App: What Broke, How We Fixed It, and How We Tested It about the lost update problem I encountered while fixing a bug in spacely_web that had been unsolved for years — covered what a lost update is, why MySQL InnoDB's REPEATABLE READ doesn't save you from read-modify-write on a JSON column, how two parallel jobs each merging a different key into WorkflowRun#progress end up dropping one key, the with_lock fix we shipped, and a threaded RSpec setup using two Queues to reproduce the race and show failing vs passing output