A production project that stopped earning its keep. The original problem it solved is not public.
Its users at the time.
Built, ran, and maintained a production project.
Founder, builder, operator.
Not public
Not public
Maintenance time, attention, and the honest question of whether it was the right thing to build.
Retired deliberately. The lesson: a working system that nobody maintains is a liability, and retiring it on purpose is a decision, not a failure.
The product, its history, and its numbers are private and stay that way.
Keep the lesson. Do not resurrect it without evidence of demand.