chore: split down relationship.test.ts

Author: avallete

jest.config.js

@@ -2,4 +2,8 @@ module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
   collectCoverageFrom: ['src/**/*', '!src/types.ts'],
+  // Run tests sequentially to prevent database side effects
+  maxWorkers: 1,
+  // Ensure deterministic test order
+  testSequencer: '<rootDir>/test/testSequencer.js',
 }