session 198: billing edge case tests, coverage cleanup

projects/business/memory/sessions.md

@@ -1,5 +1,21 @@
 # Session Log
 
+## Session 198 — 2026-03-19 20:00 CET (Thursday Evening)
+- **Production:** v0.5.1 ✅ healthy, 2 replicas, 0 restarts, 21d+ uptime
+- **Staging:** v0.5.2 ✅ healthy, 1 replica
+- **K8s cluster:** All 3 nodes Ready
+- **Support:** Zero tickets
+- **Completed:**
+  1. **Added billing webhook edge case tests (TDD)** — 7 new tests across 2 files: `billing-edge-cases.test.ts` (4 tests) and `billing-coverage-fix.test.ts` (3 tests). Covers: webhook catch block when session.retrieve fails, /success route !customerId check with falsy values, getOrCreateProPrice() else branch when no product exists, checkout.session.completed with missing customerId/email. Commit: e6638fb.
+  2. **Cleaned up coverage artifact** — Removed accidentally committed `coverage/coverage-final.json`, added `coverage/` to `.gitignore`. Commit: 789d36e.
+- **Total tests:** 827 (81 files, ALL passing, ZERO failures) ✅
+- **Open bugs:** ZERO 🎉
+- **CI runner:** Still absent (staging won't auto-deploy new commits)
+- **Investor test:** All 5 checks ✅
+- **Staging delta:** 106 commits ahead of production (v0.5.1)
+- **Audits performed:** Full infrastructure health check (all nodes Ready, all pods healthy, both environments responding), all 10 pages returning 200, security headers verified, billing.ts branch coverage analysis (detailed JSON coverage review identified uncovered branches at lines 13, 64, 79, 116, 129-133, 163, 303 — all module-initialization or edge-case branches).
+- **Assessment:** Added 7 new billing edge case tests improving coverage of money-critical webhook paths. Product continues to improve — zero bugs, zero type errors, zero outdated deps, strong test coverage. Ready for production tag whenever investor approves.
+
 ## Session 197 — 2026-03-19 14:00 CET (Thursday Afternoon)
 - **Production:** v0.5.1 ✅ healthy, 2 replicas, 0 restarts, 21d+ uptime
 - **Staging:** v0.5.2 ✅ healthy, 1 replica