docs(02-02): complete DELETE logs endpoint plan — summary and state update

- 02-02-SUMMARY.md: backend DELETE endpoint + frontend deleteLog wiring
- STATE.md: phase 2 marked complete, decisions added, position advanced to phase 3 ready

.planning/STATE.md

@@ -5,33 +5,33 @@
 See: .planning/PROJECT.md (updated 2026-02-15)
 
 **Core value:** Logging a workout should be fast, clear, and flexible — the app never fights the user during a session
-**Current focus:** Phase 1 — Input UX
+**Current focus:** Phase 2 — Flexible Sets (complete)
 
 ## Current Position
 
-Phase: 2 of 3 (Flexible Sets)
-Plan: 1 of 2 in current phase (02-01 complete)
-Status: Phase 2 in progress — plan 02-01 done, 02-02 pending
-Last activity: 2026-02-21 — Completed 02-01 (ExerciseCard dynamic setList, add-set modal, delete-set)
+Phase: 2 of 3 (Flexible Sets) — COMPLETE
+Plan: 2 of 2 in current phase (02-01 and 02-02 complete)
+Status: Phase 2 complete — ready for Phase 3 planning
+Last activity: 2026-02-21 — Completed 02-02 (DELETE /api/logs endpoint + deleteLog wiring)
 
-Progress: [█████░░░░░] 50%
+Progress: [███████░░░] 67%
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 3
-- Average duration: ~1.3 min
-- Total execution time: ~0.07 hours
+- Total plans completed: 5
+- Average duration: ~2.8 min
+- Total execution time: ~0.23 hours
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
 | 01-input-ux | 3/3 | ~4 min | ~1.3 min |
-| 02-flexible-sets | 1/2 | ~8 min | ~8 min |
+| 02-flexible-sets | 2/2 | ~10 min | ~5 min |
 
 **Recent Trend:**
-- Last 5 plans: 01-01 (1 min), 01-03 (2 min), 01-02 (1 min), 02-01 (8 min)
+- Last 5 plans: 01-01 (1 min), 01-03 (2 min), 01-02 (1 min), 02-01 (8 min), 02-02 (2 min)
 - Trend: fast
 
 *Updated after each plan completion*
@@ -54,7 +54,9 @@ Progress: [█████░░░░░] 50%
 - Dropset weight drops: 80% then 60% of base weight, each rounded to nearest 2.5kg per app progression convention
 - Last-set guard: handleDeleteSet returns early if setList.length <= 1, delete button also disabled in DOM
 - progress-badge and all-done class reference setList.length instead of exercise.sets — badge reflects actual set count
-- onDeleteSet prop is optional stub in ExerciseCard — backend wiring deferred to plan 02-02
+- No authMiddleware on DELETE /api/logs — consistent with POST /api/logs which also passes user_id in body
+- deleteLog silently ignores 404 from backend — unlogged sets deleted mid-session cause no harm
+- Composite key (user_id, program_exercise_id, date, set_number) uniquely identifies a workout set log row for deletion
 
 ### Pending Todos
 
@@ -67,5 +69,5 @@ None yet.
 ## Session Continuity
 
 Last session: 2026-02-21
-Stopped at: Completed 02-01-PLAN.md (ExerciseCard dynamic setList, add-set modal, delete-set button)
+Stopped at: Completed 02-02-PLAN.md (DELETE /api/logs endpoint + deleteLog wiring through App.jsx and WorkoutPage)
 Resume file: None