given txns (amount, date, description), identify recurring ones (same amount + descr at regular intervals - weekly, biweekly, monthly). group by (amount, descr_normalized). within each group, check if dates form an arithmetic progression w tolerance. followup: subscriptions w slight amount variance. fuzzy matching.

Plaid phone - find recurring txns

given txns (amount, date, description), identify recurring ones (same amount + descr at regular intervals - weekly, biweekly, monthly).