docs(01-01): complete UPSERT + FK enforcement plan

- Create 01-01-SUMMARY.md documenting both bug fixes and test addition
- Advance plan counter to 2/2 in STATE.md
- Record decisions and metrics in STATE.md
- Update ROADMAP.md plan progress (1/2 summaries)
- Mark requirements DATA-01 and DATA-02 complete

.planning/STATE.md

@@ -1,3 +1,17 @@
+---
+gsd_state_version: 1.0
+milestone: v1.0
+milestone_name: milestone
+status: Ready to execute
+stopped_at: Completed 01-01-PLAN.md (UPSERT + FK enforcement)
+last_updated: "2026-03-23T20:16:27.362Z"
+progress:
+  total_phases: 4
+  completed_phases: 0
+  total_plans: 2
+  completed_plans: 1
+---
+
 # Project State
 
 ## Project Reference
@@ -5,20 +19,17 @@
 See: .planning/PROJECT.md (updated 2026-03-23)
 
 **Core value:** Reliable, persistent visibility into which services need updating — data never disappears, and the dashboard is the one place you trust to show the full picture.
-**Current focus:** Phase 1 — Data Integrity
+**Current focus:** Phase 01 — data-integrity
 
 ## Current Position
 
-Phase: 1 of 4 (Data Integrity)
-Plan: 0 of ? in current phase
-Status: Ready to plan
-Last activity: 2026-03-23 — Roadmap created; ready to begin Phase 1 planning
-
-Progress: [░░░░░░░░░░] 0%
+Phase: 01 (data-integrity) — EXECUTING
+Plan: 2 of 2
 
 ## Performance Metrics
 
 **Velocity:**
+
 - Total plans completed: 0
 - Average duration: —
 - Total execution time: —
@@ -30,10 +41,12 @@ Progress: [░░░░░░░░░░] 0%
 | - | - | - | - |
 
 **Recent Trend:**
+
 - Last 5 plans: —
 - Trend: —
 
 *Updated after each plan completion*
+| Phase 01 P01 | 2 | 2 tasks | 2 files |
 
 ## Accumulated Context
 
@@ -46,6 +59,8 @@ Recent decisions affecting current work:
 - Backend refactor must be behavior-neutral — all existing tests must pass before PostgreSQL is introduced
 - No ORM or query builder — raw SQL per store implementation; 8 operations across 3 tables is too small to justify a dependency
 - `DATABASE_URL` present activates PostgreSQL; absent falls back to SQLite with `DB_PATH` — no separate `DB_DRIVER` variable
+- [Phase 01]: Use named-column UPSERT (ON CONFLICT DO UPDATE) to preserve tag_assignments child rows on re-insert
+- [Phase 01]: Enable PRAGMA foreign_keys = ON in InitDB() before DDL to activate ON DELETE CASCADE for tag deletion
 
 ### Pending Todos
 
@@ -58,6 +73,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-23
-Stopped at: Roadmap created; STATE.md initialized
+Last session: 2026-03-23T20:16:27.360Z
+Stopped at: Completed 01-01-PLAN.md (UPSERT + FK enforcement)
 Resume file: None