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Build an ordered playlist API with Go, gqlgen and Ent on ClickHouse Managed Postgres. Authenticated account tokens scope reads and writes; creation is atomic, and reordering uses a parent lock, observed revision, exact membership validation and deferred position uniqueness. GraphQL mutations permit one expanded top-level field, and bounded eager reads keep nested metadata coherent.
Validation includes six native unit cases, eleven distinct Cloud HTTP cases across full and targeted runs, two native Cloud controls for TLS and snapshot coherence, actual deferred COMMIT failure, measured three-statement eager reads at both fixture sizes, clean native generation/build and a real graceful process replacement. The dedicated Cloud fixture has been deleted after review. CI runs module verification, formatting, unit tests, deterministic generation and compilation without Cloud credentials.
The README includes role-separated setup, migration, TLS, request examples and cleanup. Shared runtime database credentials remain trusted; API ownership is not RLS. The companion article remains a local unpublished draft.