How I Built a 93-Day Streak Engine in Postgres That Scales to 28K Users
Streaks are the backbone of habit-forming products. Duolingo has them. Strava has them. GitHub has them. And if you're building anything where users show up daily — a fitness tracker, a journal, a learning platform — you'll eventually need a streak system.
I learned this firsthand building Wishyze, an AI-powered daily ritual platform. Our longest active streak is 93 days and counting. Across 28,547 users, we track millions of daily completions — and the streak calculation has to be fast, accurate, and bulletproof.
Here's exactly how we built it, including the schema, the queries, the edge cases, and the mistakes I'd avoid if I were starting over.
The problem, stated simply
