Trial → paid conversion funnel.

Of the listeners who STARTED a trial inside the last days, what share upgraded to a paid tier (plus / pro) — within 7 days, within 30 days, or ever (lifetime)? Reads the append-only listener_subscription_events log (migration 0143): a trial_started row marks the cohort entry, a subsequent upgraded row (to a paid tier) marks conversion.

Conversion is measured relative to EACH listener's own trial-start time, not a fixed calendar window, so the 7d / 30d buckets are true time-to-convert cohorts. lifetime counts any paid upgrade after the trial started, regardless of elapsed time.

The point is signal on the trial wedge: a healthy 7d conversion means the trial is doing its job; a big gap between 7d and lifetime means listeners convert late and a nudge campaign could pull it forward.