Bernard Siebens
ae93406853
Documents a revision, not a rewrite. The snapshot-on-Due pattern, dated prices and the asymmetric dry-run commands are sound and are kept; what's wrong is three hardcoded assumptions in models.py: annual-only periods, a global GRACE_DAYS, and grace measured from period_end -- which gives a club ~410 days of unpaid use before archive_overdue_clubs will touch it. Proposes per-plan duration/lead/grace, grace measured from period_start, a Tier -> Plan rename, and a club-facing unpaid-dues warning with a countdown to archiving. Flags the migration hazard prominently: re-deriving grace_until on existing dues under the new rule puts the date in the past for every open annual period, which would archive the whole paying customer base on the next --commit run.