Completes the lifecycle family from #25 — usage caps were the third
sibling (after expiry #24 and revoke), written-but-never-enforced.
Model:
- PolicyRule gains windowSeconds; drops the never-enforced mutable
currentUsageCount. A cap = (maxUsageCount, windowSeconds): at most N
signings of this (method,kind) per rolling window. windowSeconds NULL
= lifetime; maxUsageCount NULL = uncapped.
- New SigningLog: durable append-only record of allowed signings — the
source of truth caps count against (derive-don't-count; no counter to
drift).
Enforcement (checkIfPubkeyAllowed step 4): among the live token's
matching rules, every capped rule must have remaining budget in its
window (COUNT(SigningLog) < maxUsageCount), counted live. Stacked caps
all bind — 20/hr AND 200/day enforced together. recordSigning() writes
a SigningLog row from the permit callback when a consequential request
(sign_event / encrypt / decrypt) is allowed.
Retune live: new update_policy_rule admin RPC patches maxUsageCount/
windowSeconds/method/kind in place; takes effect next request, no
re-pairing (a payoff of the #27 Option D design). get_policies now
returns each rule's id + window_seconds so callers can target it.
Retention/pruning of SigningLog is a follow-up.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Padreug
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