diff --git a/UAT_PLAYBOOK.md b/UAT_PLAYBOOK.md
index 1c4243f..c5bdf04 100644
--- a/UAT_PLAYBOOK.md
+++ b/UAT_PLAYBOOK.md
@@ -119,6 +119,7 @@ GroomBook API is a Hono-based REST service (TypeScript/Node.js) powering the pet
 | TC-API-3.25 | Verify 30+ total pets in UAT DB | GET /api/pets then count total | 30+ pets returned (UAT seed creates 500 random-pool + 5 UAT test clients + 2 UAT customer = 507 total) |
 | TC-API-3.26 | Verify 25-35% medicalAlerts distribution | GET /api/pets (first 30 pets), count how many have non-empty medicalAlerts | Ratio is 25-35% (seed uses rand() < 0.3 for ~30% distribution) |
 | TC-API-3.27 | Verify coat_type enum has all seed values | After UAT seed completes, inspect the coat_type enum on the UAT DB — it must contain: short, medium, long, double, wire, silky, curly, hairless | UAT seed jobs (`reset-demo-data`, `seed-test-data`) complete 1/1 with no `enum_in` error; coat_type includes all 8 values used by seed.ts `coatTypePool` |
+| TC-API-3.28 | Verify pet_size_category enum has all seed values | After UAT seed completes, inspect the pet_size_category enum on the UAT DB — it must contain: small, medium, large, extra_large | UAT seed jobs (`reset-demo-data`, `seed-test-data`) complete 1/1 with no `enum_in` error; pet_size_category includes all 4 values used by seed.ts `petSizeCategoryPool` (regression for GRO-1999, mirrors TC-API-3.27) |
 
 ### 4.4 Appointment Scheduling
 
diff --git a/packages/db/migrations/0038_register_extra_large_pet_size_category.sql b/packages/db/migrations/0038_register_extra_large_pet_size_category.sql
new file mode 100644
index 0000000..e80fe7f
--- /dev/null
+++ b/packages/db/migrations/0038_register_extra_large_pet_size_category.sql
@@ -0,0 +1,4 @@
+-- GRO-1999: 0037 was skipped on existing DBs due to a below-high-water-mark
+-- journal timestamp. Re-register extra_large with a monotonic timestamp so
+-- the existing UAT/persistent DBs apply it. Idempotent.
+ALTER TYPE "pet_size_category" ADD VALUE IF NOT EXISTS 'extra_large';
diff --git a/packages/db/migrations/meta/_journal.json b/packages/db/migrations/meta/_journal.json
index bf6fd92..0645748 100644
--- a/packages/db/migrations/meta/_journal.json
+++ b/packages/db/migrations/meta/_journal.json
@@ -260,6 +260,13 @@
       "when": 1751500000000,
       "tag": "0037_add_extra_large_to_pet_size_category",
       "breakpoints": true
+    },
+    {
+      "idx": 38,
+      "version": "7",
+      "when": 1780000000000,
+      "tag": "0038_register_extra_large_pet_size_category",
+      "breakpoints": true
     }
   ]
 }