# Phase 1.0DH: hash-bound snapshot query

Status: `OFFLINE_QUERY_IMPLEMENTED_NO_SNAPSHOT_NO_LIVE_ACQUISITION`

Phase 1.0DH implements the DG primitive for local snapshots only. It accepts an
exact size and SHA-256 binding, rejects files larger than 64 MiB or without the
SQLite 3 header, then opens the database with `mode=ro&immutable=1` and enables
`PRAGMA query_only`. It never creates a result file.

The only query is parameterized for fixed title `PPSA01659`. Exactly one row is
`PRESENT`, zero rows is `ABSENT`, and duplicate rows, schema mismatch or SQLite
errors are `UNKNOWN`. Identity and format mismatches are rejected before SQL.

Synthetic tests create disposable host databases and verify present, absent,
ambiguous and rejected cases, including absence of journal or WAL sidecars.
These tests are not PS5 evidence. No real snapshot is tracked or available.

The module contains no network adapter, socket, CLI, target source or artifact.
It cannot retrieve the database and authorizes no console operation. The next
offline step is to audit whether a consistent, bounded, binary-safe acquisition
can be formed at all and, if so, define the minimum exact authorization needed.