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packages/cli/test/integration/services/execution-metadata.service.test.ts

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+import { createWorkflow, testDb } from '@n8n/backend-test-utils';
+import { ExecutionMetadataRepository } from '@n8n/db';
+import { Container } from '@n8n/di';
+
+import { ExecutionMetadataService } from '@/services/execution-metadata.service';
+import { createExecution } from '@test-integration/db/executions';
+
+let executionMetadataRepository: ExecutionMetadataRepository;
+let executionMetadataService: ExecutionMetadataService;
+
+beforeAll(async () => {
+	await testDb.init();
+
+	executionMetadataRepository = Container.get(ExecutionMetadataRepository);
+	executionMetadataService = Container.get(ExecutionMetadataService);
+});
+
+afterAll(async () => {
+	await testDb.terminate();
+});
+
+afterEach(async () => {
+	await testDb.truncate(['User']);
+});
+
+describe('ProjectService', () => {
+	describe('save', () => {
+		it('should deduplicate entries by exeuctionId and key, keeping the latest one', async () => {
+			//
+			// ARRANGE
+			//
+			const workflow = await createWorkflow();
+			const execution = await createExecution({}, workflow);
+			const key = 'key';
+			const value1 = 'value1';
+			const value2 = 'value2';
+
+			//
+			// ACT
+			//
+			await executionMetadataService.save(execution.id, { [key]: value1 });
+			await executionMetadataService.save(execution.id, { [key]: value2 });
+
+			//
+			// ASSERT
+			//
+			const rows = await executionMetadataRepository.find({
+				where: { executionId: execution.id, key },
+			});
+
+			expect(rows).toHaveLength(1);
+			expect(rows[0]).toHaveProperty('value', value2);
+		});
+	});
+});