Restart ARR

ARR from previously churned customers starting a new paid subscription within a defined window. Tracked separately from gross new as hygiene: win-backs are a different motion from first-time buyers and should not flatter acquisition metrics.

Common windows: about 12 months for enterprise (churn is formally communicated), 3 to 6 months for self-serve and PLG (customers move more often). Beyond the window, count the return as gross new.