diff --git a/docs/operations/production-server-migration-2026-08.md b/docs/operations/production-server-migration-2026-08.md
index 53264032..d15374a5 100644
--- a/docs/operations/production-server-migration-2026-08.md
+++ b/docs/operations/production-server-migration-2026-08.md
@@ -11,6 +11,16 @@ This runbook moves production to the current reviewed `staging` release while al
 
 This is not a volume copy. A full Supabase dump must not be restored over the target database.
 
+## Confirmed migration decisions
+
+- production Owner: `luna@copse.life` / `b8907d0c-6ed0-4270-b866-7e83bb4a1b26`;
+- source Supabase project: `vtvnfqmonbfuxmqkqdlc`;
+- the legacy production `ADMIN_EMAILS` allowlist contains only the designated Owner, and the legacy database has no `public.admin_users`; the ETL seeds that attested Owner into the target admin model;
+- payment and model-provider ciphertext mode: `exclude`; re-enter both configurations after cutover with newly generated encryption keys;
+- release policy: validate on `staging`, then promote the same accepted SHA to production;
+- DNS remains unchanged until the final ETL and reconciliation pass;
+- proposed maintenance window: `2026-08-12 02:00–04:00 UTC+8`, pending operator confirmation after rehearsal timing.
+
 ## Release invariants
 
 The production deployment and schema-migration workflows are manual-only and accept a full lowercase 40-character `deploy_sha`. A normal production mutation proceeds only when all of the following identify that exact SHA:
@@ -30,7 +40,7 @@ Repository variables:
 | Name | Required value |
 | --- | --- |
 | `PRODUCTION_HOST` | `118.194.235.34` |
-| `PRODUCTION_PORT` | Confirmed SSH port; do not assume `22` |
+| `PRODUCTION_PORT` | `22` (confirmed on 2026-08-09) |
 | `PRODUCTION_USER` | `deploy` |
 | `PRODUCTION_PATH` | `/opt/jyotisha-production` |
 | `PRODUCTION_URL` | `https://jyotisha.chat` |
diff --git a/frontend/scripts/migrate-supabase-production.mjs b/frontend/scripts/migrate-supabase-production.mjs
index 01f6ce73..293d9e18 100644
--- a/frontend/scripts/migrate-supabase-production.mjs
+++ b/frontend/scripts/migrate-supabase-production.mjs
@@ -392,10 +392,9 @@ async function readSourceUsers(source, sourceAuthSchema, activeAdminUserIds) {
   );
 }
 
-async function readActiveAdminUserIds(source, sourceTables) {
-  if (!sourceTables.has("admin_users")) {
-    throw new SafeProductionMigrationError("source public.admin_users is missing");
-  }
+export async function readActiveAdminUserIds(source, sourceTables, ownerUserId) {
+  // Legacy production used a single ADMIN_EMAILS allowlist and has no admin tables.
+  if (!sourceTables.has("admin_users")) return new Set([ownerUserId]);
   const result = await source.query(
     "select user_id from public.admin_users where revoked_at is null order by user_id",
   );
@@ -442,6 +441,7 @@ async function assertNoUnmappedSourceTables(source, sourceTables, targetTables)
 }
 
 async function assertActiveAdminRoles(source, sourceTables, ownerUserId) {
+  if (!sourceTables.has("admin_users")) return;
   if (!sourceTables.has("admin_user_roles") || !sourceTables.has("admin_roles")) {
     const result = await source.query(
       `select count(*)::bigint as count from public.admin_users where revoked_at is null and user_id <> $1`,
@@ -715,7 +715,7 @@ async function preflightContext(source, target, config, { requireEmpty = true }
     readSchema(source, "auth"),
     readSchema(target, "public"),
   ]);
-  const activeAdminUserIds = await readActiveAdminUserIds(source, sourcePublic);
+  const activeAdminUserIds = await readActiveAdminUserIds(source, sourcePublic, config.ownerUserId);
   const users = await readSourceUsers(source, sourceAuth, activeAdminUserIds);
   assertActiveAdminUsers(users, activeAdminUserIds, config.ownerUserId);
   if (requireEmpty) await assertTargetEmpty(target, targetPublic);
diff --git a/frontend/tests/production-data-migration.test.ts b/frontend/tests/production-data-migration.test.ts
index 4c43392c..840a0b42 100644
--- a/frontend/tests/production-data-migration.test.ts
+++ b/frontend/tests/production-data-migration.test.ts
@@ -10,6 +10,7 @@ import {
   normalizeAuthUser,
   normalizeAuthUsers,
   parseMode,
+  readActiveAdminUserIds,
   readConfiguration,
   readSchema,
   rowsSha256,
@@ -126,6 +127,20 @@ test("production identity preflight rejects duplicate canonical emails", () => {
   );
 });
 
+test("legacy production without admin tables promotes only the designated Owner", async () => {
+  const ownerId = "018f4e6d-7a11-7000-8000-000000000001";
+  const source = {
+    async query() {
+      throw new Error("legacy fallback must not query a missing admin_users table");
+    },
+  };
+
+  assert.deepEqual(
+    [...await readActiveAdminUserIds(source, new Map(), ownerId)],
+    [ownerId],
+  );
+});
+
 test("active administrators become usable identity admins", () => {
   const ownerId = "018f4e6d-7a11-7000-8000-000000000001";
   const adminId = "018f4e6d-7a11-7000-8000-000000000002";