React Native SQLite: 0ms UI with debounced writes

I stopped blocking my UI on SQLite writes. I batch writes in-memory, then flush every 250ms. I still guarantee durability on app background. Copy-paste hook + SQLite schema + flush logic inside. Context My fitness app logs sets fast. Like “tap, tap, done”. I timed myself. 5 seconds per set entry is the bar. Offline-first means SQLite. Not AsyncStorage. I need queries like “last 3 workouts for chest” and “total volume by week”. SQLite wins. But I hit a brutal issue. I was doing a DB write on every tap. Reps change? Write. Weight change? Write. Mark set done? Write. On a warm device it felt fine. On a slightly busy device it stuttered. The UI thread wasn’t “blocked” technically, but React state updates were waiting behind JS work + bridge work + DB calls. End result: dropped frames. So I changed the rule. UI state updates are immediate. DB writes are delayed and batched. And I still don’t lose sets. 1) I measured the stutter. Then I got mad. I started with numbers. Not vibes. I added a l