migrations/0003_attestations.sql: one row per Phase, no UPDATE/DELETE
grant for trf_app (a published attestation is permanent).
src/target_revenue/attestation.py: publish_attestation() is idempotent
(existing row returned unchanged, never regenerated) and derives
conversion_timestamp from the ledger itself via _find_conversion_prefix(),
which finds the earliest prefix where the fold reaches Outstanding
Target = 0 rather than trusting entries[-1] or wall-clock publish time -
so a later unrelated entry can never change an already-converged Phase's
recorded conversion moment. Raises NotConvertedError rather than
fabricating a conversion. Reuses conversion.generate_attestation()
unchanged. Guarded the psycopg import behind TYPE_CHECKING so the pure
helper stays testable under plain system Python.
service/app.py adds GET /phases/{id}/attestation (unauthenticated,
publish-on-first-observation).
tests/test_attestation.py (3 tests, no Docker/Postgres) proves the
earliest-crossing behavior. 6 new Docker-gated tests in
test_ledger_hosting.py cover pre-conversion 404, the core
legal-technical property that /metrics facts/calculations/forecasts
are identical whether or not /attestation was ever called, one-time
publication, signature verification, and DB-level UPDATE/DELETE
rejection.
src/target_revenue/metrics.py: compute_metrics(manifest, entries, as_of)
is pure/deterministic like fold.py, reusing fold.py/conversion.py
unchanged. Returns facts/calculations/forecasts as three explicitly
separated blocks (TrustServicePRD TS-FR-5), covering the mandatory Q9
set plus the recommended velocity/forecast tier - forecasts are always
null rather than populated once a Phase has converted or velocity is
non-positive, so nothing disguises a projection as a fact.
Adds GET /phases/{id}/metrics (unauthenticated per FR-9/FR-10).
tests/test_metrics.py (6 tests) needs no Docker/Postgres and runs
under plain system Python. One new Docker-gated test in
test_ledger_hosting.py proves the hosted /metrics response exactly
matches compute_metrics() run offline against the same export.
migrations/0002_ledger.sql adds ledger_entries with an identity-column
sequence for exact append order and no UPDATE/DELETE grant for trf_app.
src/target_revenue/ledger.py: append_entry() rejects caller-supplied
previous_entry_hash/signature, enforces per-Licensor phase ownership,
serializes concurrent appends via pg_advisory_xact_lock, computes the
chain tip and signs with the Trust Service instance's own Ed25519 key
(service/keys.py), reusing validation.py's checks unchanged. Adds
POST/GET /phases/{id}/ledger and an unauthenticated GET /public-key.
Also fixes a route-ordering bug found while wiring this in: phase IDs
never needed the {phase_id:path} converter (they contain colons, not
slashes), and its greedy matching was swallowing /ledger-suffixed
paths into the plain GET /phases/{id} route.
tests/test_ledger_hosting.py (8 Docker-gated tests) exercises hash-chain
linkage, forged-field rejection, cross-Licensor isolation, currency and
duplicate-id rejection, DB-privilege enforcement, signature
verification via the public-key endpoint, and the task's own
highest-priority property: append -> export -> offline fold reproduces
the exact expected Development/Remission Credit and Outstanding Target.
