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stack/docs/scratchpads/tess-m1-sec-006-session-gc-scope.md
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fix(#707): scope session GC retention
2026-07-12 16:34:32 -05:00

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# Scratchpad — TESS-M1-SEC-006 Session GC scope
- **Task / issue:** TESS-M1-SEC-006 / #707
- **Branch:** `fix/tess-session-gc-scope` from `origin/main` at `59e49cfd`
- **Objective:** Make session cleanup session-scoped and prevent automatic global retention/GC without an authorized, auditable operation.
- **Scope:** `apps/gateway`, `packages/log`, admin/developer operations documentation.
- **Budget:** Task estimate 18K; no explicit hard cap supplied.
- **Assumption:** No authorized global retention service exists today. Existing full/sweep GC must therefore be disabled from startup and cron paths, while single-session cleanup remains available.
## Plan
1. Add failing isolation tests proving single-session cleanup only demotes its own logs and automatic startup/scheduled GC cannot globally delete session data.
2. Add session-scoped log repository retention and make `collect(sessionId)` use it.
3. Remove automatic full/sweep GC invocation; preserve any future global operation behind an explicit authorization/audit seam.
4. Document the operational boundary, run gates, review, and commit without push.
## Verification evidence
- Isolation TDD: `pnpm --filter @mosaicstack/gateway test -- session-gc.service.spec.ts commands.integration.spec.ts command-executor-p8012.spec.ts` — 61 passed.
- `pnpm typecheck` — passed.
- `pnpm lint` — passed.
- `pnpm format:check` remains red only on the known pre-existing Tess documentation debt; changed files are Prettier-clean.