fix: multiple bug fixes

isolated users, db backup, weird disconnect issues for long voice sessions,

electron/cqrs/queries/handlers/getCurrentUserId.ts

@@ -0,0 +1,9 @@
+import { DataSource } from 'typeorm';
+import { MetaEntity } from '../../../entities';
+
+export async function handleGetCurrentUserId(dataSource: DataSource): Promise<string | null> {
+  const metaRepo = dataSource.getRepository(MetaEntity);
+  const metaRow = await metaRepo.findOne({ where: { key: 'currentUserId' } });
+
+  return metaRow?.value?.trim() || null;
+}