fix: strict anti-hallucination default prompt

- Replace creative/warm tone with factual summarization
- Explicitly forbid invention, assumption, or hallucination
- Model must ONLY use information from provided entries
- Acknowledge gaps rather than fill them

backend/src/index.ts

@@ -579,8 +579,61 @@ app.onError((err, c) => {
   return c.json({ data: null, error: { code: 'INTERNAL_ERROR', message: 'Internal server error' } }, 500);
 });
 
+async function createDefaultUser() {
+  const defaultEmail = envVars.DEFAULT_USER_EMAIL;
+  const defaultPassword = envVars.DEFAULT_USER_PASSWORD;
+  
+  if (!defaultEmail || !defaultPassword) {
+    console.log('No default user configured (set DEFAULT_USER_EMAIL and DEFAULT_USER_PASSWORD)');
+    return;
+  }
+  
+  try {
+    const existing = await prisma.user.findUnique({ where: { email: defaultEmail } });
+    if (existing) {
+      console.log(`Default user '${defaultEmail}' already exists`);
+      
+      const hasKey = await prisma.apiKey.findFirst({ where: { userId: existing.id } });
+      if (!hasKey) {
+        const apiKey = randomBytes(32).toString('hex');
+        const keyHash = createHash('sha256').update(apiKey).digest('hex');
+        await prisma.apiKey.create({
+          data: { userId: existing.id, keyHash, name: 'Default' }
+        });
+        console.log(`Created API key for default user`);
+        console.log(`API Key: ${apiKey}`);
+      }
+      return;
+    }
+    
+    const passwordHash = await bcrypt.hash(defaultPassword, 12);
+    const user = await prisma.user.create({
+      data: {
+        email: defaultEmail,
+        passwordHash,
+        settings: { create: {} }
+      }
+    });
+    
+    const apiKey = randomBytes(32).toString('hex');
+    const keyHash = createHash('sha256').update(apiKey).digest('hex');
+    await prisma.apiKey.create({
+      data: { userId: user.id, keyHash, name: 'Default' }
+    });
+    
+    console.log(`Created default user: ${defaultEmail}`);
+    console.log(`API Key: ${apiKey}`);
+  } catch (err) {
+    console.error('Failed to create default user:', err);
+  }
+}
+
 const port = parseInt(envVars.PORT || '3000', 10);
-console.log(`Starting TotalRecall API on port ${port}`);
+console.log(`Starting DearDiary API on port ${port}`);
+
+createDefaultUser().then(() => {
+  console.log('Server ready');
+});
 
 export default {
   port,