diff --git a/apps/api/src/routes/admin/seed.ts b/apps/api/src/routes/admin/seed.ts
index 1220991..4458811 100644
--- a/apps/api/src/routes/admin/seed.ts
+++ b/apps/api/src/routes/admin/seed.ts
@@ -36,6 +36,19 @@ const DEMO_PET = {
   weightKg: "30.00",
 };
 
+const UAT_CLIENT = {
+  name: "UAT Customer",
+  email: "uat-customer@groombook.dev",
+  phone: "555-0100",
+  address: "1 UAT Lane, Test City, CA 90210",
+  status: "active" as const,
+};
+
+const UAT_PETS = [
+  { name: "Bella", species: "Dog", breed: "Poodle", coatType: "curly", weightKg: "20.00" },
+  { name: "Max", species: "Dog", breed: "Labrador Retriever", coatType: "short", weightKg: "30.00" },
+];
+
 const DEMO_SERVICES = [
   { id: "b0000001-0000-0000-0000-000000000001", name: "Bath & Brush", description: "Full bath, blow-dry, brush out, and ear cleaning", basePriceCents: 4500, durationMinutes: 45 },
   { id: "b0000001-0000-0000-0000-000000000002", name: "Full Groom — Small", description: "Complete grooming for dogs under 25 lbs", basePriceCents: 6500, durationMinutes: 60 },
@@ -43,7 +56,7 @@ const DEMO_SERVICES = [
   { id: "b0000001-0000-0000-0000-000000000004", name: "Nail Trim", description: "Nail clipping and filing", basePriceCents: 1500, durationMinutes: 15 },
 ];
 
-adminSeedRouter.post("/seed", async (c) => {
+adminSeedRouter.post("/", async (c) => {
   // Refuse to run when AUTH_DISABLED — dev environments use direct-DB seeding
   if (process.env.AUTH_DISABLED === "true") {
     return c.json(
@@ -128,6 +141,51 @@ adminSeedRouter.post("/seed", async (c) => {
     results.push(`Created pet '${DEMO_PET.name}' for Demo Client (id: ${created!.id})`);
   }
 
+  // ── Client: UAT Customer ──────────────────────────────────────────────────
+  const [existingUatClient] = await db
+    .select()
+    .from(clients)
+    .where(eq(clients.email, UAT_CLIENT.email));
+
+  let uatClientId: string;
+  if (existingUatClient) {
+    uatClientId = existingUatClient.id;
+    results.push(`Client '${UAT_CLIENT.name}' already exists (id: ${uatClientId})`);
+  } else {
+    const [created] = await db.insert(clients).values(UAT_CLIENT).returning();
+    uatClientId = created!.id;
+    results.push(`Created client '${UAT_CLIENT.name}' (id: ${uatClientId})`);
+  }
+
+  // ── Pets: UAT Customer's Pets ─────────────────────────────────────────────
+  const existingUatPets = await db
+    .select()
+    .from(pets)
+    .where(eq(pets.clientId, uatClientId));
+
+  for (const uatPet of UAT_PETS) {
+    const existing = existingUatPets.find(
+      (p) => p.name === uatPet.name && p.species === uatPet.species
+    );
+    if (existing) {
+      results.push(`Pet '${uatPet.name}' already exists for UAT Customer (id: ${existing.id})`);
+    } else {
+      const [created] = await db
+        .insert(pets)
+        .values({
+          clientId: uatClientId,
+          name: uatPet.name,
+          species: uatPet.species,
+          breed: uatPet.breed,
+          coatType: uatPet.coatType as any,
+          weightKg: uatPet.weightKg,
+          dateOfBirth: new Date("2019-01-01T00:00:00Z"),
+        })
+        .returning();
+      results.push(`Created pet '${uatPet.name}' for UAT Customer (id: ${created!.id})`);
+    }
+  }
+
   return c.json({
     message: "Seed complete",
     details: results,
diff --git a/src/routes/admin/seed.ts b/src/routes/admin/seed.ts
index efd461e..114461f 100644
--- a/src/routes/admin/seed.ts
+++ b/src/routes/admin/seed.ts
@@ -36,6 +36,19 @@ const DEMO_PET = {
   weightKg: "30.00",
 };
 
+const UAT_CLIENT = {
+  name: "UAT Customer",
+  email: "uat-customer@groombook.dev",
+  phone: "555-0100",
+  address: "1 UAT Lane, Test City, CA 90210",
+  status: "active" as const,
+};
+
+const UAT_PETS = [
+  { name: "Bella", species: "Dog", breed: "Poodle", coatType: "curly", weightKg: "20.00" },
+  { name: "Max", species: "Dog", breed: "Labrador Retriever", coatType: "short", weightKg: "30.00" },
+];
+
 const DEMO_SERVICES = [
   { id: "b0000001-0000-0000-0000-000000000001", name: "Bath & Brush", description: "Full bath, blow-dry, brush out, and ear cleaning", basePriceCents: 4500, durationMinutes: 45 },
   { id: "b0000001-0000-0000-0000-000000000002", name: "Full Groom — Small", description: "Complete grooming for dogs under 25 lbs", basePriceCents: 6500, durationMinutes: 60 },
@@ -43,7 +56,7 @@ const DEMO_SERVICES = [
   { id: "b0000001-0000-0000-0000-000000000004", name: "Nail Trim", description: "Nail clipping and filing", basePriceCents: 1500, durationMinutes: 15 },
 ];
 
-adminSeedRouter.post("/seed", async (c) => {
+adminSeedRouter.post("/", async (c) => {
   // Refuse to run when AUTH_DISABLED — dev environments use direct-DB seeding
   if (process.env.AUTH_DISABLED === "true") {
     return c.json(
@@ -128,6 +141,51 @@ adminSeedRouter.post("/seed", async (c) => {
     results.push(`Created pet '${DEMO_PET.name}' for Demo Client (id: ${created!.id})`);
   }
 
+  // ── Client: UAT Customer ──────────────────────────────────────────────────
+  const [existingUatClient] = await db
+    .select()
+    .from(clients)
+    .where(eq(clients.email, UAT_CLIENT.email));
+
+  let uatClientId: string;
+  if (existingUatClient) {
+    uatClientId = existingUatClient.id;
+    results.push(`Client '${UAT_CLIENT.name}' already exists (id: ${uatClientId})`);
+  } else {
+    const [created] = await db.insert(clients).values(UAT_CLIENT).returning();
+    uatClientId = created!.id;
+    results.push(`Created client '${UAT_CLIENT.name}' (id: ${uatClientId})`);
+  }
+
+  // ── Pets: UAT Customer's Pets ─────────────────────────────────────────────
+  const existingUatPets = await db
+    .select()
+    .from(pets)
+    .where(eq(pets.clientId, uatClientId));
+
+  for (const uatPet of UAT_PETS) {
+    const existing = existingUatPets.find(
+      (p) => p.name === uatPet.name && p.species === uatPet.species
+    );
+    if (existing) {
+      results.push(`Pet '${uatPet.name}' already exists for UAT Customer (id: ${existing.id})`);
+    } else {
+      const [created] = await db
+        .insert(pets)
+        .values({
+          clientId: uatClientId,
+          name: uatPet.name,
+          species: uatPet.species,
+          breed: uatPet.breed,
+          coatType: uatPet.coatType as any,
+          weightKg: uatPet.weightKg,
+          dateOfBirth: new Date("2019-01-01T00:00:00Z"),
+        })
+        .returning();
+      results.push(`Created pet '${uatPet.name}' for UAT Customer (id: ${created!.id})`);
+    }
+  }
+
   return c.json({
     message: "Seed complete",
     details: results,