First of three PRs for v0.5.0 (J: framework; K: real geocoder backends +
doc revisions; L: operator events tab + per-adapter render + events-map fix).
Design pivot: the Phase 2 "no enrichment, upstream verbatim" reading of
Matt's principle is reframed — consumers can't do follow-up lookups, they
only see what's on the wire, so whatever Central doesn't enrich is
effectively missing downstream. Enrichment is now expected. The producer-doc
§2/§10.1 rewrite lands in PR K; this PR builds the framework PR K documents.
New package src/central/enrichment/:
- base.py Enricher Protocol (name + async enrich(location) -> dict).
- geocoder.py GeocoderEnricher + GeocoderBackend Protocol + the locked
GEOCODER_FIELDS set (name, city, county, state, country,
postal_code, timezone, landclass, elevation_m) + all_null_bundle().
- cache.py EnrichmentCache — stdlib sqlite3 off the event loop via
asyncio.to_thread (no async-sqlite dep). Keyed on
(enricher_name, lat_4dp, lon_4dp); per-enricher TTL (24h
default); fresh connection per op (sqlite3 isn't thread-safe
to share). Cache even all-null; never cache backend failures.
- backends/no_op.py NoOpBackend — all-null bundle, the PR J default.
Provenance: enrichment results land under event.data["_enriched"][<name>];
everything else in data stays upstream verbatim.
Wiring:
- adapter.py enrichment_locations: list[tuple[str,str]] = [] class attr.
Empty (default) = publish as-is, no enrichment.
- config_models.py EnrichmentConfig (enricher_class, backend_class,
backend_settings, cache_ttl_s). Read once at startup.
- supervisor.py build_enrichers() + apply_enrichment(); enrichment runs
after dedup, before wrap_event, in the poll loop. Class-name
registries for enricher/backend resolution (PR K extends).
- firms.py enrichment_locations = [("latitude","longitude")] — pilot.
Enrichment config is read once at supervisor startup; hot-reload is out of
scope for PR J (noted in EnrichmentConfig + build_enrichers docstrings).
Tests (16 new):
- test_enrichment_framework.py (9): parent-dir/table init, cache miss->hit,
TTL expiry, 4dp rounding, nearby-coord collapse, concurrent-set single-row,
backend-failure all-null-not-cached (retries), success cached (one backend
call), all-null cached.
- test_geocoder_enricher.py (5): NoOp all-null, field-set == GEOCODER_FIELDS,
null-coords short-circuit (no backend call), name=="geocoder", sequential
same-coords single backend call.
- test_firms.py (+2): enrichment_locations declared + paths resolve to floats
in a real event (structural, not literal); event through supervisor
apply_enrichment emerges with data._enriched.geocoder == all-null bundle.
Verification: full pytest 495 passed (was 479; +16). grep for
subject_for_event/_ADAPTER_REGISTRY clean. Module imports cleanly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
