Distillation

Date: Sep 15, 2026

• 🔴 (16:15) User directed work to continue in /home/byk/Code/opencode.
• 🔴 [requested-bug-fix] (16:15) User requested one concrete parent-audit fix: packages/core/src/session/context-epoch.ts advance called SessionExecutionClaim.update(db, claim) before updating SessionContextEpochTable outside the claim transaction, allowing takeover between statements and stale durable context mutation.
• 🔴 (16:15) User required claim verification/renewal and the context epoch update to execute in one immediate transaction, matching the existing insert and replace pattern.
• 🔴 [requested-tests] (16:15) User requested a deterministic regression that reaches the real implementation and proves stale ownership cannot mutate the epoch, either by pausing around ownership loss/takeover and stale advance or by an equivalent deterministic mechanism; duplicating predicates in the test was prohibited.
• 🔴 [requested-review] (16:15) User requested an audit of adjacent claim-guarded writes in the current redesign for the same check-then-write gap, with fixes limited to concrete equivalent gaps and a report of findings.
• 🔴 [enforced-workflow] (16:15) User prohibited unrelated-file changes, commits, builds, live-service operations, and the full test suite for this task.
• 🔴 [requested-tests] (16:15) User required focused relevant tests with --printConsoleTrace, Core typecheck, and git diff --check, followed by files/commands/results and remaining-risk reporting.
• 🔴 (16:15) User stated package tests must never be run from the repository root; they must be run from package directories such as packages/core.
• 🔴 (16:15) User-provided Effect guidance requires using current Effect v4 / effect-smol source and nearby repository patterns rather than memory or older Effect v2/v3 examples; .opencode/references/effect-smol should be consulted or cloned from https://github.com/Effect-TS/effect-smol if absent.
• 🟡 (16:15) Assistant stated the required repo-setup skill was unavailable and proceeded using already-loaded repository instructions.
• 🔴 (16:16) User stated an expired session execution claim never renews itself.
• 🔴 (16:16) User-provided claim semantics state lease timestamps use node wall clocks; SESSION_EXECUTION_LEASE_MS must exceed maximum deployment clock skew plus one renewal interval, and execution IDs fence a node immediately after takeover.
• 🟡 (16:16) Investigation of packages/core/src/session/execution/claim.ts found SessionExecutionClaim.update(db, claim, values = {}) checks session_id, execution id, owner_id, and expires_at > now, renews expires_at to now + SESSION_EXECUTION_LEASE_MS, and dies with SessionExecutionClaim.Lost when no row matches.
• 🟡 (16:16) Investigation found SessionExecutionClaim.transaction(db, claim, effect) wraps SessionExecutionClaim.update(db, claim) and the guarded effect in db.transaction(..., { behavior: "immediate" }).
• 🟡 (16:17) Adjacent claim-guarded-write audit found only one direct equivalent check-then-write gap: SessionContextEpoch.advance. SessionContextEpoch.insert and SessionContextEpoch.replace already use SessionExecutionClaim.transaction(...); event commit callbacks execute inside EventV2’s immediate transaction.
• 🟡 (16:18) Code change updated packages/core/src/session/context-epoch.ts so advance uses the explicit claim transaction pattern for claim renewal/verification and SessionContextEpochTable mutation rather than separate statements.
• 🟡 (16:18) Regression-test work updated packages/core/test/session-projector.test.ts; the intended regression exercises the real SessionContextEpoch.prepare path and ownership-loss behavior rather than duplicating claim predicates.
• 🟡 (16:18) Patch modified exactly 2 files at this stage: packages/core/src/session/context-epoch.ts and packages/core/test/session-projector.test.ts.