Archive-context GUCs are bare shared-namespace names (app.user_id / app.archive_reason): rename agreed in terra_13, never scheduled
FILED 2026-08-16 by pm-terra-cc because it was NOT filed anywhere. Surfaced while db-terra-cc enumerated GUC names for TERRA-28: the rename is described as "still pending" and its only record is a comment inside terra_13, which recorded it as deliberately out of scope for that migration. Grep of the terra backlog for guc/rename/app.user_id/archive_reason returns nothing. A pending commitment with no tracker row and no owner is indistinguishable from one nobody intends to do. THE STATE, as measured: fn_terraRequireArchiveContext (terra_5) reads app.user_id and app.archive_reason. Both are BARE - no terra prefix. Every archive-context path in terra goes through that one function: terraPracticas, the five detail tables, and (after TERRA-28/31) terraPacienteImplantologia. So the whole archive-context mechanism rests on two names in a namespace shared with enamel. WHAT PROTECTS IT TODAY IS A PROMISE, NOT A MECHANISM. db-enamel-cc made a unilateral commitment that enamel will not use bare app.user_id / app.archive_reason. Nothing in either codebase enforces it, nothing detects a violation, and the failure is silent in the worst direction: if enamel ever sets app.user_id for its own purposes in a session that also touches terra rows, terra archive rows record ENAMEL user ids and read as correct. There is no assertion that would fire. THIS IS THE SAME EXPOSURE CLASS TERRA ALREADY MEASURED ONCE - one GUC string disarmed guards across both tenants (terra_11). See memory shared-guc-names-couple-tenants and shared-guc-namespace-is-shared-state. The rename to app.terraUserId / app.terraArchiveReason is the fix that was agreed and never scheduled. SCOPE: this is NOT part of TERRA-28 or TERRA-31 and must not be folded into either. Those reuse the existing function as-is and introduce zero new GUC surface - correctly. A rename touches every archive-context caller at once and deserves its own migration, its own review, and its own coordination with db-enamel-cc, since the names being shared is the entire subject. BEFORE DDL: this is a shared-namespace change by definition, so db-enamel-cc GO is REQUIRED before apply, not after drafting. Establish first whether enamel reads either name today - the commitment says no; that is a claim, not a measurement, and the whole WI exists because a promise was standing in for a control. CONSTRAINT: any CREATE OR REPLACE on fn_terraRequireArchiveContext must restate SET search_path = public, pg_temp verbatim and the migration must assert proconfig afterwards. Omitting it silently un-pins the function and no row count or successful apply can observe it.
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Coupling found while closing TERRA-10, and it changes how this rename must be verified. All four bypass GUC branches (app.bypass_terraArchiveAppendOnly, app.bypass_terraHardDelete, app.bypass_terraTruncate, app.bypass_terraCountersGuard) have NEVER executed - measured 2026-08-16 against pg_get_functiondef plus the fired-branch record. So the branches this WI edits have no prior behaviour to regression-check against: there is no before-state to compare a rename to, and no existing observation can distinguish a correct rename from one that silently stops matching. A green apply here proves strictly less than a green apply on an exercised path. Whatever this WI ships needs its own must-fail arm - a deliberate wrong-GUC case proving the branch still denies - because nothing already in place can fail on a bad rename.
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FORK RESOLVED. Ordering approved: setter-side dual-write, NOT guard-side dual-accept. Stays ONE WI, three steps, two lanes. SCOPE CORRECTED, and the correction is mine: my dispatch said "terra 13 functions", which reads as a scope claim. It is a DRAFTING rule for whatever the migration writes. db-terra-cc measured the real scope against pg_get_functiondef across ALL public functions, terra-named and not: exactly ONE reader of the bare names, fn_terraRequireArchiveContext. Five callers invoke it and none reference the GUC names, so none are edited. Zero enamel readers today, matching terra_13 2026-08-01 and re-established rather than inherited. WHY GUARD-SIDE DUAL-ACCEPT WAS REJECTED: it recreates the terra_11 coupling exactly - a caller that does not know the new name still satisfies the old check, on a BARE name in a namespace enamel can reach. The window it opens is the defect this WI exists to close, so widening it to make the cutover comfortable inverts the WI. STEPS: 1. coder-terra-cc: archive-context.ts sets BOTH old and new names. No guard reads the new name yet, so nothing changes behaviourally. 2. db-terra-cc: migration flips the guard to the new names only. Hard cutover. Must-fail control proving the OLD name no longer arms the guard. 3. coder-terra-cc: drop the redundant old-name set_config. Not required for safety. THE LOAD-BEARING CONSTRAINT, and it is not obvious: STEP 1 IS NOT CONFIRMED BY A DEPLOY LANDING. set_config with is_local true is transaction-scoped and cannot be observed from outside the transaction, so a version match proves the code shipped and says nothing about whether the new names are set where the guard will read them. Acceptance for step 1 is an observation of both new GUC values from INSIDE a real guarded write transaction. Instrument is coder-terra-cc choice. Without it, step 2 flips the guard onto a name nobody has ever seen populated and every guarded write raises P0001. BLAST RADIUS if step 2 is wrong: every guarded write raises P0001. LOUD, immediate, and reversible by re-applying the guard against the old names - one migration. Recorded so nobody softens it into a fail-open: loud is the survivable direction here and the fail-open alternative is the thing the guard exists to prevent. db-enamel-cc GO is REQUIRED and is asked AT STEP 2 AGAINST THE MIGRATION TEXT, never now against this plan. A GO is scoped to the revision that was read; carrying a plan-stage approval onto later SQL is the defect, not the shortcut. Direct db-terra-cc / coder-terra-cc coordination authorized - no PM relay.
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SCOPE BOUND ON THIS WI CLOSE, recorded before the work starts so the close cannot be read wider than it is. TERRA-33 renames TWO bare shared-namespace GUC names - app.user_id and app.archive_reason - read by exactly ONE function, fn_terraRequireArchiveContext. It does NOT close the class. A THIRD bare name in the same shared namespace exists and guards the audit table: app.bypass_appEvents, the string that disarms tg_appEvents_immutable via enamel-owned fn_forbidAppEventsMutation. Surfaced 2026-08-16 by db-terra-cc while refusing to patch the TERRA-42 probe row. Filed as TERRA-45 - enamel-owned, terra-side tracking only, deliberately NOT folded in here. SO: closing TERRA-33 means terra own archive-context GUCs are namespaced. It does NOT mean terra is off bare shared-namespace GUC names. Writing that down now because the close will otherwise produce a clean verdict about a narrower question than the one it appears to answer - the failure this project has hit repeatedly, and the narrowing is invisible from inside the check.
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STEP 1 SHIPPED (coder lane): SHA e62379dd8f37681fc441a97c7b45339180e1e8f0, APP VERSION 0.20.2, live-verified 0.20.2 / dpl_mRRgj7jdGQ7ri1uXSsCM7eqzdM5x / dbOk true at 11:22:59Z. audit-terra-ca PASS msvpsl4gjag1. setArchiveContext now issues four set_config calls in ONE statement - bare app.user_id/app.archive_reason plus prefixed app.terraUserId/app.terraArchiveReason, same $1/$2, all transaction-local - so the guard flip becomes a one-sided change with no deploy/apply coupling. Dual-ACCEPT on the guard side is BANNED and the code says why. NOT THE ACCEPTANCE: both names read back from inside a live guarded WRITE transaction is db-terra-cc's leg (write authority; coder DB access is SELECT-only). audit could not run it either - no DATABASE_URL_SESSION in their workspace. COMPOSITION BOUNDARY for the eventual close: coder unit pins assert terra EMITS the SQL, the db fixture asserts the DB HONOURS it, neither observes the other, and nothing yet proves the deployed app issued it on a real request - unexercised, not verified.
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All 3 steps applied. Step 1 setter e62379d v0.20.2; step 2 guard terra_23 (db-enamel-cc GO, in-migration proconfig + must-fail + must-pass); step 3 old-name setter dropped c591bcc v0.20.5, audit PASS msvr6oueemcu, live 0.20.5 dpl_5S1BzLZWjVcSyKVhSmf7YLkbtJzT. Guard now reads only app.terraUserId / app.terraArchiveReason. BOUND, not rounded up: clearance to drop the old names rests on 7 literal-substring axes (pg_proc all schemas, enamel repo, terra src, 0/172 views+matviews, 0/68 triggers, 0/205 column defaults, 0/9 pg_db_role_setting) - a runtime-assembled name is invisible to all 7, and the census is point-in-time. Setter and guard have still NEVER met at runtime: zero guarded writes are possible while the FK chain to pacientes is empty, tracked on TERRA-46, not here. Acceptance was the direct-call fixture (form b), never a trigger-firing DML.