part ok

mobile/services/db/session.ts

@@ -0,0 +1,18 @@
+import { getDatabase } from './client';
+import type { SQLiteBindValue } from 'expo-sqlite';
+
+export type DbSession = {
+  runAsync(sql: string, ...params: SQLiteBindValue[]): Promise<unknown>;
+  getFirstAsync<T>(sql: string, ...params: SQLiteBindValue[]): Promise<T | null>;
+  getAllAsync<T>(sql: string, ...params: SQLiteBindValue[]): Promise<T[]>;
+};
+
+let override: DbSession | null = null;
+
+export function __setDbForTests(db: DbSession | null): void {
+  override = db;
+}
+
+export async function getSession(): Promise<DbSession> {
+  return override ?? (await getDatabase());
+}