## Ticket 001: Set up persistent local storage for session data

**Sources:** data-persists-correctly-when-app-closes-and-reopens
**Owner:** tweedledum
**Tier:** v1
**Estimate:** 1-2 days, 75% confident
**Status:** open

**Dependencies:**
- Blocks: start-run-session, session-timer-ui, break-timer-ui, custom-duration-settings, session-history-list
- Blocked by: —
- Soft: —

**Description:**

Implement local storage abstraction layer for persisting focus sessions, break history, and user settings. This is the foundation for all other v1 work — nothing else can ship until data survives app close/reopen. Design the schema to accommodate session metadata (start time, duration, end state), break records, and user preferences (custom durations). Keep the interface generic so frontend and backend can coordinate on the seam without tight coupling.

**Acceptance:**
- Session data survives app close and reopen
- Break history persists across sessions
- User settings persist across app restarts
- Schema is versioned for future migrations

**Risk:**

If storage quota or performance on mobile devices becomes an issue, estimate extends to 2-3 days. Test with realistic session history volumes early.
