Add EsignUsageRecord for per-signature usage metering

Shipped

June 9, 2026 at 11:15 PM UTC

Author

Kamo

Commit

fa63d7c

New append-only usage entity (mirrors AiUsageRecord) emitted at signature completion. Only API-origin signatures count toward a plan's monthly included quota + overage (sign.pink Business: 40/mo included, then $0.20 each); MANUAL single-user signatures are recorded but never billed. billing_period (YYYY-MM) supports monthly aggregation; reported_to_stripe makes Stripe usage submission idempotent. Additive only; no version bump.