# Tweedledum's Reading of Tests 004–006

## Query surfaces (from test code)

### Feature 004: GET /sessions/range
- Query params: start_date (YYYY-MM-DD), end_date (YYYY-MM-DD), page (1-indexed), limit (1–500 capped)
- Returns: {sessions: [...], count: total, page: page, limit: limit}
- Filtered: is_completed=true AND is_deleted=false only
- Ordered: start_time DESC (newest first)
- Pagination: offset = (page-1)*limit
- Validation: dates must be ISO8601 YYYY-MM-DD; end_date >= start_date

### Feature 005: GET /config, PATCH /config
- GET /config: no params, returns {session_length_minutes, break_length_minutes, timezone}
- PATCH /config: body {session_length_minutes?, break_length_minutes?, timezone?}
- Validation: session_length_minutes in [1, 120]; break_length_minutes in [1, 60]
- Idempotency: omitted fields in PATCH don't reset (partial update semantics)

### Feature 006: DELETE /sessions/{id}
- Soft delete: sets is_deleted=true
- Idempotency: second DELETE on already-deleted returns 204 or 404
- Conflict: cannot DELETE completed session (409)
- Not found: 404 on nonexistent or already-deleted

## Backend state invariants encoded in tests

1. Config is singleton (id=1)
2. Sessions have state: (is_active, is_completed, is_deleted)
3. Only sessions with is_completed=true appear in /today and /range
4. Deleted sessions never appear in counts
5. Completed/deleted sessions are immutable
6. start_session requires no active session (returns 409 if one exists)

## Contract surface: clear, complete, implementable

All three test files encode unambiguous contracts. Backend implementation I've shipped matches all documented assertions.

## Flag: Alice's stories missing from thread

Hatter has shipped failure-mode scenarios (with severity triage). Tweedledee has shipped test files. I've shipped backend implementation. But Alice has not shipped user-journey stories for 004–006.

Tests are sufficient for implementation (they *are* the contract). But team should be aware: if Alice's stories surface a persona need or use case that the test assumptions didn't anticipate, we'll need to rework. For now, proceeding on test-first basis.
