You are given user sign-up data and downstream product interaction events from Chime surfaces such as SpotMe, Pay Anyone, and Savings. Write a PostgreSQL query to return, for each signed-up user, the first feature they touched after sign-up. Only count events that occurred at or after the user's signup_at timestamp, and ignore events where the feature name is NULL. If a user has multiple qualifying events at the exact same timestamp, break ties by the smallest event_id. Include users who signed up but never touched a feature, showing NULL for the feature and event timestamp.
