Refactoring

* replace TypeORM with Kysely query builder
* refactor migrations
* other changes and fixes

apps/server/src/kysely/utils.ts

@@ -0,0 +1,13 @@
+import { KyselyDB, KyselyTransaction } from './types/kysely.types';
+
+export async function executeTx<T>(
+  db: KyselyDB,
+  callback: (trx: KyselyTransaction) => Promise<T>,
+  existingTrx?: KyselyTransaction,
+): Promise<T> {
+  if (existingTrx) {
+    return await callback(existingTrx);
+  } else {
+    return await db.transaction().execute((trx) => callback(trx));
+  }
+}