-- Tier 2 Block E — host analytics.
--
-- The only schema change for analytics is opt-in source attribution on
-- tokens. Counts, funnels, and histograms are all derived from existing
-- tables (events / guests / tokens / rsvps / access_logs) via aggregation
-- queries with a 60-second Redis cache in front.

ALTER TABLE tokens
    ADD COLUMN IF NOT EXISTS utm_source TEXT;