Adjust license expiry by a signed delta

Moves one license's expiry by deltaSeconds — positive to grant time, negative to take it back. {licenseId} accepts the printable license key as well as the UUID, so a settlement loop never has to resolve one first.

Written for time-wager features ("key gambling"), where a customer stakes minutes against your own game logic and your server settles the result. Prefer this over reading expires_at and writing it back with PUT /licenses/{licenseId}: the delta is applied inside a single statement, so two settlements landing at the same instant compose instead of one silently overwriting the other.

Behaviour worth knowing:

- Expiry floors at now — a loss bigger than the time remaining expires the key; it never rewinds into the past. - duration_seconds and banked remaining_seconds floor at 0. - A paused license keeps its expiry, and the delta is applied to its banked seconds instead. - A lifetime key (expires_at: null) is left untouched and returns lifetime: true — there is no expiry to move. - The redeemer's subscription moves in the same statement, so the SDK and your panel never disagree about when access ends.

{
  "deltaSeconds": -1800
}

{
  "success": true,
  "license": {
    "id": "9c1f2e7a-5b30-4a11-9d64-0f2b8c7a5e10",
    "key": "HA7N-9CGB-RFV2-MPAN",
    "status": "active",
    "expiresAt": "2026-09-01T12:00:00.000Z",
    "remainingSeconds": null
  },
  "applied_seconds": -1800,
  "lifetime": false,
  "subscriptions_updated": 1
}