perf(db): pragma, транзакции, индексы, версия схемы, SQL-фильтры и очистка

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

packages/db/vitest.config.ts

@@ -0,0 +1,5 @@
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  test: { passWithNoTests: true, include: ['test/**/*.test.ts'] },
+})