sqlite local

mobile/services/db/repositories/preferences.ts

@@ -1,11 +1,32 @@
 import { getDatabase } from '../client';
-import { PREFERENCES_KEY } from '../schema';
+import { DEVICE_USER_ID_KEY, PREFERENCES_KEY } from '../schema';
 import type { UserPreferences } from '../types';
 
 const DEFAULT_PREFERENCES: UserPreferences = {
   syncMode: 'full',
 };
 
+export async function getDeviceUserId(): Promise<string> {
+  const db = await getDatabase();
+  const row = await db.getFirstAsync<{ value: string }>(
+    'SELECT "value" FROM user_preferences WHERE "key" = ?',
+    DEVICE_USER_ID_KEY,
+  );
+  if (row) return row.value;
+
+  await db.runAsync(
+    `INSERT OR IGNORE INTO user_preferences ("key", "value", updated_at)
+     VALUES (?, lower(hex(randomblob(16))), ?)`,
+    DEVICE_USER_ID_KEY,
+    Date.now(),
+  );
+  const seeded = await db.getFirstAsync<{ value: string }>(
+    'SELECT "value" FROM user_preferences WHERE "key" = ?',
+    DEVICE_USER_ID_KEY,
+  );
+  return seeded!.value;
+}
+
 export async function saveUserPreferences(preferences: UserPreferences): Promise<void> {
   const db = await getDatabase();
   await db.runAsync(