The original title is "Dev Log: 2026-07-09 — one source of truth, three times over"

Short summary

A dev log covering three projects unified by a single-source-of-truth principle: a registry-driven sidebar switcher reading one config file, a converged password-change flow across multiple systems with fixed backend ordering and audit logging, and a CDP-style identity layer with idempotent ingest, profile resolution, PII encryption, and erasure cascade. The recurring lesson is that duplication becomes a bug only when copies disagree in production.

• •Sidebar, switcher, and breadcrumbs all derive from one config/menu.php source
• •Password sync converged to fixed-order backends with no partial success possible
• •CDP identity layer features encrypted PII, blind index lookups, and erasure cascade with audit log

Generated with AI, which can make mistakes.