Milestone.paymentId + project_milestone.payment_id (SQLite + Postgres,
additive). setMilestone(..., paymentId?) resolves the payment's
received_on to stamp done_on when a payment-step tick links a real
payment; the linked payment must belong to the same client. api.ts
threads paymentId from the milestone POST body.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Thomas Joise