Decompose SourceService along the aggregate boundary and then correct the
instruction file that caused it to grow, in that order. The refactor is the
empirical test of the rule.
services/evidence.py (new)
EvidenceService owns ExecutionAttempt: read_latest_execution_attempt,
list_execution_attempts, promote_machine_attempt, build_evidence_export,
plus the LatestExecutionAttempt projection. Moved verbatim from sources.py.
services/errors.py (new)
The five-class error hierarchy (PromptLoadError, TranscriptionError,
TranscriptionNotFoundError, SourceDeleteBlockedError,
CandidatePromotionError) moved out of sources.py. evidence.py needs
TranscriptionNotFoundError, and test_service_boundaries.py correctly
rejected the sibling import. errors.py defines no *Service class, so it is
a legal shared home. This was the boundary test doing its job, not an
obstacle to route around.
sources.py 1,389 -> 885 lines (1,063 after Phase 2).
services/__init__.py
ServiceBundle and from_session_factory register evidence. Note that
field-by-field ServiceBundle construction silently binds services to the
process-global session factory via default_factory; from_session_factory is
the only safe constructor. Two test bundles were fixed for this.
.github/instructions/services.instructions.md
Rewritten to describe the boundaries the decomposition actually produced,
per plan Phase 3 task 7 and review log [59].
- "1 service class per data model" -> one service class per aggregate.
The table-shaped rule is the measured cause of sources.py reaching
1,389 lines; DocumentType has no lifecycle without Document.
- New Model Ownership section. Junctions are owned by their lifecycle
owner, the service that creates and deletes the rows: document_person
to PeopleService (sole writer, measured), job_source to SourceService.
Two carve-outs are stated rather than left as silent violations:
cascade deletion when a service deletes its own aggregate root, and
status transitions that create and delete nothing (cancel_job,
resubmit_failed_sources), which are Job lifecycle events on the work
queue. EvidenceService.promote_machine_attempt's two-field write to
Source is named and scoped.
- Mandatory CRUD softened to intent. It was already false: five modules
define no service class, EvidenceService has no create/delete because
ExecutionAttempt is append-only, RegistryService uses <op>_entry.
- Separated reading across models via eager loads from the owning root,
which is allowed, from importing another service, which is not. The old
line 13 and lines 75-77 read as contradictory.
- Typo: picutre.
No code was moved to satisfy the rule.
tests/test_service_boundaries.py
Docstring no longer cites the instruction file by line number; that anchor
would desynchronise silently. errors.py added to the neutral-module list.
Verified: 292 passed, 4 skipped, 0 ruff, 0 ty. All 25 /ui/* routes walked
against the live app; 24x 200. /ui/documents/{id}/sources 404s via a 307 that
drops the /ui prefix, confirmed pre-existing (last touched in 6a3ee26) and
left alone as out of scope.
Co-authored-by: Copilot App <[email protected]>
Jim Lancaster
