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Search a fictional directory by longitude, latitude, radius in meters, category and a bounded limit. Deno/Oak and Postgres.js query PostGIS geography with parameterized ST_DWithin, exact spheroidal distance ordering and a stable ID tie-breaker; a small browser form shows sorted cards.
Separate administrator/schema-owner commands install PostGIS, migrate and seed. The application uses a SELECT-only role, verified Cloud CA/hostname and explicit cached Deno permissions, with no automatic runtime DDL.
Validation on 2 October 2026: frozen install, formatting, lint/type checks, 3 domain tests, empty-schema bootstrap plus repeated migration/seed, 7 real Cloud tests and 6 browser/HTTP checks passed. Checks include spatial edge cases/date line, grant denials with the read-only default disabled, TLS negative/positive controls, unforced EXPLAIN, mobile layout and confirmed graceful process restart. CI runs only local checks without Cloud secrets.
The fixture is 12 synthetic rows; its observed index/sort plan is not a scale benchmark. The app has no pagination, authentication or mutation routes and binds to loopback. Companion article and raw acceptance evidence are local and excluded from this PR.