test(vitest): serialize db-backed suites

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

vitest.config.ts

@@ -5,6 +5,7 @@ export default defineConfig({
 	test: {
 		environment: 'node',
 		globals: true,
+		fileParallelism: false,
 		include: ['src/tests/**/*.test.ts'],
 		coverage: {
 			provider: 'v8',