Fix: user:logged_in event never fires

[aryanranderiya]

Problem

Zero user:logged_in events in the last 30 days. The event is never being fired, which means:

• No visibility into returning user sessions
• DAU metric is blind
• "Signup to first login" funnel returns no data

Root Cause

The frontend check in apps/web/src/features/auth/hooks/useFetchUser.ts (line 53) guards the tracking call behind:

if (accessToken || refreshToken) {
  trackEvent(ANALYTICS_EVENTS.USER_LOGGED_IN, { ... });
}

But the backend OAuth callback (/workos/callback in apps/api/app/api/v1/endpoints/oauth.py) redirects to /redirect with only an HttpOnly cookie set — it never passes access_token or refresh_token as URL query params. The condition is always false, so the event never fires.

Additionally, returning users who auto-login via the wos_session cookie have zero analytics visibility.

Proposed Fix

1. Backend: Track user:logged_in server-side in OAuth callback

• Add USER_LOGGED_IN = "user:logged_in" to AnalyticsEvents in apps/api/app/services/analytics_service.py
• Add a track_login() helper (mirrors existing track_signup() pattern)
• In apps/api/app/services/oauth/oauth_service.py, modify store_user_info() to return (user_id, is_new_user) — call track_login() in the existing-user branch

2. Frontend: Add session resumption tracking

• Remove the dead accessToken/refreshToken login tracking code from useFetchUser.ts
• Add a user:session_resumed event using sessionStorage — fires once per browser session when a returning user is auto-authenticated via cookie
• Add USER_SESSION_RESUMED to ANALYTICS_EVENTS in apps/web/src/lib/analytics.ts

Resulting Event Model

Scenario	Event	Tracked Where
New user signs up	user:signed_up	Backend (already works)
Existing user logs in via OAuth	user:logged_in	Backend (new)
Returning user auto-auth via cookie	user:session_resumed	Frontend (new)
User logs out	user:logged_out	Frontend (already works)

Key Files

• apps/api/app/api/v1/endpoints/oauth.py — OAuth callback
• apps/api/app/services/oauth/oauth_service.py — store_user_info()
• apps/api/app/services/analytics_service.py — PostHog tracking helpers
• apps/web/src/features/auth/hooks/useFetchUser.ts — frontend auth hook
• apps/web/src/lib/analytics.ts — frontend analytics events

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Created by Claude

[linear]

GAIA-543