Record Signup Attribution

First-touch marketing attribution captured at signup.

All fields are optional. Only non-null values are persisted, and each field is written once (first non-null wins) so a later sign-in never overwrites the original campaign. Values are length-bounded since they originate from untrusted URL/cookie input.

Attributes: utm_source: Traffic source (e.g. 'google'). utm_medium: Marketing medium (e.g. 'cpc'). utm_campaign: Campaign name. utm_content: Ad/content variant. utm_term: Paid keyword (reserved for future use). gclid: Google click id for ads conversion attribution. twclid: X/Twitter click id for ads conversion attribution. rdt_cid: Reddit click id for ads conversion attribution.

Response for POST /users/me/attribution.

Attributes: success: Whether the request was processed without error. recorded: Whether any attribution field was newly written (False when nothing was supplied or every field was already set).