docs(notepads): record Option D interceptor debugging and learnings

.sisyphus/notepads/club-work-manager/issues.md

@@ -239,3 +239,20 @@ curl -s -X POST http://localhost:8080/realms/workclub/protocol/openid-connect/to
 2. Document JWT claim requirements in API authentication specification
 3. Add integration test: Verify all required JWT claims present before API token validation
 
+
+## 2026-03-05: RESOLVED - Silent Write Failures Due to Uncommitted Transaction
+
+**Issue:** All write operations (INSERT/UPDATE/DELETE) appeared to succeed but data never persisted to database.
+
+**Symptoms:**
+- HTTP 201 Created response with valid data
+- GET by ID immediately after POST returns 404
+- No error logs, no exceptions
+- EF Core SaveChanges returns success
+
+**Root Cause:** TenantDbConnectionInterceptor started transaction for SET LOCAL but never committed it.
+
+**Fix:** Replaced transaction-based approach with command text prepending. See learnings.md 2026-03-05 entry.
+
+**Status:** RESOLVED - All tests pass after fix.
+