Set timezone on initial user profile creation during email signup

Pass device timezone as user metadata in the signup request body.
Updated handle_new_user() trigger reads it from raw_user_meta_data
and writes timezone/tz_source/tz_updated_at on the initial INSERT.
Google OAuth users get timezone set on next app launch via
registerTimezone() which does .update() after the profile exists.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: schwaaamp

mobile/src/utils/supabaseAuth.ts

@@ -201,9 +201,17 @@ export async function signUpWithEmail(
   console.log(tag, "email_redirect_to:", authRedirectUrl);
 
   try {
-    const requestBody = {
+    // Include device timezone in user metadata so the handle_new_user()
+    // trigger can write it to user_profiles on initial row creation.
+    let deviceTimezone: string | undefined;
+    try {
+      deviceTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+    } catch { /* Intl unavailable — skip */ }
+
+    const requestBody: Record<string, unknown> = {
       email,
       password,
+      ...(deviceTimezone ? { data: { timezone: deviceTimezone } } : {}),
     };
     const signupUrl = `${supabaseUrl}/auth/v1/signup?redirect_to=${encodeURIComponent(authRedirectUrl)}`;
     console.log(tag, "POST signup URL:", signupUrl);

supabase/migrations/20260319100000_handle_new_user_timezone.sql

@@ -0,0 +1,25 @@
+-- Update handle_new_user() trigger to populate timezone from user metadata.
+-- Email signups pass { data: { timezone: "America/Los_Angeles" } } in the
+-- signup request. Google OAuth users get timezone set later via the mobile
+-- app's registerTimezone() on session restore.
+
+CREATE OR REPLACE FUNCTION public.handle_new_user()
+RETURNS trigger
+LANGUAGE plpgsql SECURITY DEFINER
+SET search_path TO 'public'
+AS $$
+BEGIN
+  INSERT INTO public.user_profiles (user_id, email, name, picture_url, google_sub, timezone, tz_source, tz_updated_at)
+  VALUES (
+    NEW.id,
+    NEW.email,
+    NEW.raw_user_meta_data->>'name',
+    NEW.raw_user_meta_data->>'picture',
+    NEW.raw_user_meta_data->>'sub',
+    NEW.raw_user_meta_data->>'timezone',
+    CASE WHEN NEW.raw_user_meta_data->>'timezone' IS NOT NULL THEN 'device' ELSE NULL END,
+    CASE WHEN NEW.raw_user_meta_data->>'timezone' IS NOT NULL THEN now() ELSE NULL END
+  );
+  RETURN NEW;
+END;
+$$;