Refill the month's credits for every active AppSumo subscription whose month has closed.

Meant for a daily GCP Cloud Scheduler hit — it picks up whoever is due rather than firing on a fixed day, so each user renews on the anniversary of their purchase. Running it more than once a day is harmless: a subscription is only due while its renewal date is in the past, and renewing pushes that a month forward.

A gap in the schedule does not compound. If the job is down for three months the user gets one month's credits and the date moves to the next future anniversary — credits are an allowance, not a balance that accrues.

limit is for a cautious first run; leave it off in the schedule. email plus force is the repair path for one customer whose renewal was missed, and dry_run shows the effect first.