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      {
        "question": "D3 — Architecture issue 1: global mutable AuthCache shared by two services with unserialized mutations\nProject/branch/task: main branch, PLAN.md \"Multi-tenant Auth Refactor\" (reduced scope: AuthBroker, SessionMint, AuthCache).\nELI10: PLAN.md:19-20 has AuthBroker and SessionMint both import one module-level AuthCache and both write to it, and PLAN.md:10 says nothing serializes those writes. Picture SessionMint invalidating tenant A on suspension at the same instant AuthBroker writes a freshly refreshed token for tenant A. Last writer wins, the suspended tenant keeps a valid session, and nothing logs it. The module-level export also means every test shares one cache, so tests pass or fail depending on run order.\nStakes if we pick wrong: a suspended or logged-out tenant stays authenticated silently, which is the one failure an auth system must never have; plus flaky tests forever.\nRecommendation: 1A because a single mutation owner with constructor injection is the boring, well-trodden fix and it maps to your explicit-over-clever preference: every caller can see which cache it holds.\nCompleteness: 1A=10/10, 1B=6/10, 1C=3/10\nNet: one injected owner of writes vs a shared global that two services race on.",
        "header": "Arch 1",
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        "options": [
          {
            "label": "1A: Inject AuthCache by constructor; AuthCache owns all writes and serializes per tenant key; every method requires tenant context (recommended)",
            "description": "✅ Invalidation can never be overwritten by a concurrent refresh: writes for one tenant key run in order through one owner. ✅ Tests construct a fresh AuthCache per case, so no cross-test state leaks. ✅ No method accepts a call without a tenant ID, so tenant isolation is enforced at the type boundary. ❌ Adds a per-key write queue or mutex plus wiring in the two service constructors (human: ~1 day / CC: ~20 min)."
          },
          {
            "label": "1B: Keep module-level export but add a per-key write lock inside AuthCache",
            "description": "✅ Fixes the lost-invalidation race with a smaller diff to call sites (human: ~half day / CC: ~10 min). ✅ Callers keep importing the same symbol they do today. ❌ Tests still share one global instance and need manual reset hooks. ❌ Hidden dependency: nothing in a service's signature says it touches the cache."
          },
          {
            "label": "1C: Do nothing; document that mutations are unserialized",
            "description": "✅ Zero implementation cost right now. ✅ Avoids touching the two service constructors this PR. ❌ Leaves a silent security failure mode (suspended tenant stays valid) in a multi-tenant auth path. ❌ Race is timing-dependent, so it will only show up in production."
          }
        ]
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    "answers": {
      "D3 — Architecture issue 1: global mutable AuthCache shared by two services with unserialized mutations\nProject/branch/task: main branch, PLAN.md \"Multi-tenant Auth Refactor\" (reduced scope: AuthBroker, SessionMint, AuthCache).\nELI10: PLAN.md:19-20 has AuthBroker and SessionMint both import one module-level AuthCache and both write to it, and PLAN.md:10 says nothing serializes those writes. Picture SessionMint invalidating tenant A on suspension at the same instant AuthBroker writes a freshly refreshed token for tenant A. Last writer wins, the suspended tenant keeps a valid session, and nothing logs it. The module-level export also means every test shares one cache, so tests pass or fail depending on run order.\nStakes if we pick wrong: a suspended or logged-out tenant stays authenticated silently, which is the one failure an auth system must never have; plus flaky tests forever.\nRecommendation: 1A because a single mutation owner with constructor injection is the boring, well-trodden fix and it maps to your explicit-over-clever preference: every caller can see which cache it holds.\nCompleteness: 1A=10/10, 1B=6/10, 1C=3/10\nNet: one injected owner of writes vs a shared global that two services race on.": "1A: Inject AuthCache by constructor; AuthCache owns all writes and serializes per tenant key; every method requires tenant context (recommended)"
    },
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    "answeredAt": "2026-09-10T23:03:42.025Z"
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}