[PERSPECTIVE P01: Hybrid architecture reintroduces the code-path divergence RFC 0058 was built to eliminate]
RFC 0058's entire raison d'etre is "the code you test is the code you ship" -- one storage engine, configuration-only differences between local and prod. A hybrid PostgreSQL+DynamoDB architecture means two query languages, two consistency models, two failure modes, and an implicit decision about which entities live where. Every "which backend handles this query?" branch is a code path that diverges between local Docker Compose (where latency and failure characteristics differ) and production. The user explicitly rejected tiered architectures for exactly this reason; a hybrid is a tiered architecture wearing a different hat.

[PERSPECTIVE P02: Local-prod parity for PostgreSQL is actually harder than for DynamoDB]
DynamoDB Local is a single Docker image with identical API surface to production. PostgreSQL local-prod parity requires matching extensions (pg_cron, pgvector if added later), version-pinned images, connection pooling behavior (PgBouncer vs serverless proxies like Neon's), and replication-lag-sensitive read patterns. Adding PostgreSQL to achieve "better relational modeling" trades one parity problem (DynamoDB's awkward graph queries) for a much larger surface area of local-prod drift.

[TENSION T01: RFC 0051's relational schema genuinely strains single-table DynamoDB design]
The 14-entity typed directed graph with M:N cross-references and recursive dependency chains is a legitimate mismatch for DynamoDB's access-pattern-first model, and ignoring this tension weakens the case for keeping RFC 0058 as-is.

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