Steward

A recurring giving ledger. Collection is exactly-once per schedule per period, receipt numbers are gap-free within a fiscal year, and period boundaries are resolved in each giver's own timezone rather than UTC.

Standing schedules

Giver	Fund	Timezone	Anchor	Amount
Ruth Abara	General Fund	America/Los_Angeles	day 1	$120.00
Daniel Okonkwo	General Fund	America/New_York	day 15	$50.00
Marisol Vega	Missions	America/Chicago	day 31	$75.00
Peter Lindqvist	Building	America/Denver	day 28	$250.00
Grace Mbeki	General Fund	Pacific/Honolulu	day 31	$30.00

Try the race. "Race 32" fires 32 simultaneous collections at one schedule for one period, the way a scheduler would if it were run twice or scaled to two workers. The ledger writes exactly one charge and refuses the other 31. The same assertion runs in TestCollectIsExactlyOnceUnderConcurrency.

Ledger

Receipt	Giver	Fund	Period	Amount	Collected on
No charges yet. Collect a schedule above.