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feat: cache sidecar with optimistic balance enforcement - #333
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Adds a speculative balance cache sidecar (apps/cache-sidecar) and a Metronome source connector (packages/source-metronome) for real-time usage-based entitlement enforcement. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> Committed-By-Agent: claude
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Summary
net_balanceendpoint, removecredit_grants/invoicesstreams, add async webhook support, addskipLimitforrate_cardsapps/cache-sidecar): standalone HTTP process for optimistic balance enforcement — reads sync engine checkpoints from Redis, tracks pending usage events, returns merged balance in <50msArchitecture
Two Redis namespaces with strict ownership:
sync:*— checkpoint data written by sync engine (read-only to sidecar)optimistic:*— pending events + derived balance (sidecar-owned)Three HTTP endpoints:
GET /v1/health,GET /v1/balance/:cid,POST /v1/eventsTest plan
pnpm --filter @stripe/sync-cache-sidecar test(25 integration tests passing)duplicate: true🤖 Generated with Claude Code