feat(db): перевести хранилище с SQLite на PostgreSQL

При старте backend накатывает схему PostgreSQL 18 и, если база пустая, один раз импортирует mikrotik.db с тома. Повторный старт не копирует данные. Бэкап в UI идёт через pg_dump.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/db/bootstrap.ts

@@ -0,0 +1,33 @@
+import { pool } from "./index.js"
+import { applySqlMigrations } from "./migrate.js"
+import { dropExpiredPartitions, ensurePartitionsAround } from "./partitions.js"
+import { importSqliteToPostgres, shouldImportSqlite } from "./sqlite-import.js"
+import { env } from "../config.js"
+
+const ETL_LOCK = 8723101
+
+export async function initDatabase(): Promise<void> {
+  await pool.query("SELECT 1")
+  await applySqlMigrations(pool)
+  await ensurePartitionsAround(pool)
+  const client = await pool.connect()
+  try {
+    await client.query("SELECT pg_advisory_lock($1)", [ETL_LOCK])
+    if (await shouldImportSqlite(pool, env.DATABASE_PATH)) {
+      console.log(`SQLite → PostgreSQL: импорт ${env.DATABASE_PATH}`)
+      const report = await importSqliteToPostgres(pool, env.DATABASE_PATH, { strict: true })
+      console.log(
+        `SQLite → PostgreSQL: готово за ${report.durationMs}ms, таблиц ${Object.keys(report.tables).length}`,
+      )
+    }
+  } finally {
+    try {
+      await client.query("SELECT pg_advisory_unlock($1)", [ETL_LOCK])
+    } catch {
+      /* ignore */
+    }
+    client.release()
+  }
+  await dropExpiredPartitions(pool)
+  await ensurePartitionsAround(pool)
+}