diff --git a/docs/circuit-list-editor-migration.md b/docs/circuit-list-editor-migration.md
index bb94bc7..12fda5b 100644
--- a/docs/circuit-list-editor-migration.md
+++ b/docs/circuit-list-editor-migration.md
@@ -43,6 +43,11 @@ Run in this order for local database workflows:
 5. Migrate legacy consumers:
    - `npm run db:migrate:legacy-consumers`
 
+The migration command finishes with a cutover verification across the complete
+database. It exits with an error while any legacy consumer lacks a migration
+mapping, including consumers that cannot be migrated because they have no circuit
+list assignment. Do not remove or disable the legacy path until this check passes.
+
 ## Validation Checks
 
 After migration, verify:
@@ -72,6 +77,6 @@ Actions:
 
 Do not delete legacy consumers yet.
 
-- legacy endpoints/views may still depend on them
+- legacy endpoints/views remain enabled only until the cutover verification passes
 - migration trace tables reference old/new mapping
 - keeping legacy rows allows comparison and rollback validation during transition
diff --git a/scripts/db-migrate-legacy-consumers.ts b/scripts/db-migrate-legacy-consumers.ts
index 44f0a24..cabe2a9 100644
--- a/scripts/db-migrate-legacy-consumers.ts
+++ b/scripts/db-migrate-legacy-consumers.ts
@@ -6,8 +6,9 @@ import { LegacyConsumerMigrationService } from "../src/domain/services/legacy-co
 
 const projectRepository = new ProjectRepository();
 const circuitListRepository = new CircuitListRepository();
+const migrationRepository = new LegacyConsumerMigrationRepository(db);
 const migrationService = new LegacyConsumerMigrationService(
-  new LegacyConsumerMigrationRepository(db)
+  migrationRepository
 );
 
 async function run() {
@@ -30,8 +31,21 @@ async function run() {
     }
   }
 
+  const unmigratedConsumers =
+    await migrationRepository.listUnmigratedConsumers();
+  if (unmigratedConsumers.length > 0) {
+    const withoutCircuitList = unmigratedConsumers.filter(
+      (consumer) => !consumer.circuitListId
+    ).length;
+    throw new Error(
+      `Cutover verification failed: ${unmigratedConsumers.length} legacy consumer(s) remain unmigrated` +
+        ` (${withoutCircuitList} without a circuit list).`
+    );
+  }
+
   console.log("Legacy consumer migration summary:");
   console.table(reports);
+  console.log("Cutover verification passed: all legacy consumers are mapped.");
 }
 
 run().catch((error) => {
diff --git a/src/db/repositories/legacy-consumer-migration.repository.ts b/src/db/repositories/legacy-consumer-migration.repository.ts
index 0be98dc..d557f3f 100644
--- a/src/db/repositories/legacy-consumer-migration.repository.ts
+++ b/src/db/repositories/legacy-consumer-migration.repository.ts
@@ -1,8 +1,9 @@
 import crypto from "node:crypto";
-import { eq, inArray } from "drizzle-orm";
+import { eq, inArray, isNull } from "drizzle-orm";
 import type { AppDatabase } from "../database-context.js";
 import { circuitDeviceRows } from "../schema/circuit-device-rows.js";
 import { circuits } from "../schema/circuits.js";
+import { consumers } from "../schema/consumers.js";
 import { legacyConsumerCircuitMigrations } from "../schema/legacy-consumer-circuit-migrations.js";
 import { legacyConsumerMigrationReports } from "../schema/legacy-consumer-migration-report.js";
 import {
@@ -36,6 +37,21 @@ export interface LegacyMigrationReportPersistenceInput {
 export class LegacyConsumerMigrationRepository {
   constructor(private readonly database: AppDatabase) {}
 
+  async listUnmigratedConsumers() {
+    return this.database
+      .select({
+        id: consumers.id,
+        projectId: consumers.projectId,
+        circuitListId: consumers.circuitListId,
+      })
+      .from(consumers)
+      .leftJoin(
+        legacyConsumerCircuitMigrations,
+        eq(legacyConsumerCircuitMigrations.consumerId, consumers.id)
+      )
+      .where(isNull(legacyConsumerCircuitMigrations.consumerId));
+  }
+
   async listMigratedConsumerIds(circuitListId: string) {
     const rows = await this.database
       .select({ consumerId: legacyConsumerCircuitMigrations.consumerId })
diff --git a/tests/legacy-consumer-migration.repository.test.ts b/tests/legacy-consumer-migration.repository.test.ts
index ca70217..29248e5 100644
--- a/tests/legacy-consumer-migration.repository.test.ts
+++ b/tests/legacy-consumer-migration.repository.test.ts
@@ -12,6 +12,7 @@ import { LegacyConsumerMigrationRepository } from "../src/db/repositories/legacy
 import { circuitDeviceRows } from "../src/db/schema/circuit-device-rows.js";
 import { circuitSections } from "../src/db/schema/circuit-sections.js";
 import { circuits } from "../src/db/schema/circuits.js";
+import { consumers } from "../src/db/schema/consumers.js";
 import { legacyConsumerCircuitMigrations } from "../src/db/schema/legacy-consumer-circuit-migrations.js";
 import { legacyConsumerMigrationReports } from "../src/db/schema/legacy-consumer-migration-report.js";
 import { projects } from "../src/db/schema/projects.js";
@@ -97,6 +98,61 @@ function assertNoMigrationWrites(context: DatabaseContext) {
 }
 
 describe("legacy consumer migration repository", () => {
+  it("reports every consumer without a completed migration mapping", async () => {
+    const { context, circuitListId, sectionId } = createTestDatabase();
+    try {
+      context.db
+        .insert(consumers)
+        .values([
+          {
+            id: "consumer-1",
+            projectId: "project-1",
+            circuitListId,
+            name: "Light 1",
+            quantity: 1,
+            installedPowerPerUnitKw: 0.1,
+            demandFactor: 1,
+          },
+          {
+            id: "consumer-2",
+            projectId: "project-1",
+            circuitListId: null,
+            name: "Light 2",
+            quantity: 1,
+            installedPowerPerUnitKw: 0.2,
+            demandFactor: 1,
+          },
+        ])
+        .run();
+      const repository = new LegacyConsumerMigrationRepository(context.db);
+
+      assert.deepEqual(
+        (await repository.listUnmigratedConsumers()).sort((left, right) =>
+          left.id.localeCompare(right.id)
+        ),
+        [
+          {
+            id: "consumer-1",
+            projectId: "project-1",
+            circuitListId,
+          },
+          {
+            id: "consumer-2",
+            projectId: "project-1",
+            circuitListId: null,
+          },
+        ]
+      );
+
+      repository.persistCircuitListMigration(
+        migrationInput(circuitListId, sectionId)
+      );
+      assert.deepEqual(await repository.listUnmigratedConsumers(), []);
+    } finally {
+      context.close();
+    }
+  });
+
   it("commits circuits, rows, mappings and report together", () => {
     const { context, circuitListId, sectionId } = createTestDatabase();
     try {