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Central - data hub spine. Adapters -> NATS/JetStream -> archive.
- Python 89.1%
- HTML 9.3%
- CSS 1.3%
- PLpgSQL 0.3%
8612f0b75d
Opens the v0.8.x data-quality cleanup arc. Production code; central-gui AND
central-supervisor restart (adapter contract + enrichment behavior change).
NWIS events rendered as a bare "Water reading: 111 ft3/s" with an empty Location
column -- an operator couldn't tell where the gauge is or whether 111 ft3/s is
drought-low, normal, or near-flood. Coordinates were present but the reverse
geocoder returns null city/state/county for rural gauge points, and USGS site +
percentile data was never fetched. v0.8.0 fetches both.
Approach B (adapter-owned, per the proposal decision): the NWIS adapter -- which
already owns the USGS APIs -- fetches site metadata and daily stats itself and
writes two provenance bundles under event.data["_enriched"]:
- usgs_site {name, lat, lon, state, county} from the OGC monitoring-locations
item-by-id (the API family the adapter already speaks; JSON, no RDB parser).
- usgs_stats {value, percentile, class_label, severity_band, p10..p90, record_max,
count, period} from the legacy RDB daily-statistics service (the OGC API has no
stats endpoint). USGS percentiles are % of days at-or-below, so higher = higher
flow; classified to the WaterWatch bands -> severity 0-4 (record=4, much
above/below=3, above/below=2, normal=1; None reserved for "no stats", distinct
from a normal-flow gauge). Severity is set on the event, so it drives the v0.7.1
severity chip-picker filter + v0.7.2 map-marker opacity.
- new nwis_enrich.py: pure parse/classify/percentile/band helpers + a sqlite
SiteStatsCache (site TTL 365d, stats TTL 90d -- one fetch per site+param serves
every reading for the window, so a warm cache makes zero USGS calls). USGS down
-> cached-if-present else all-null bundle; the event still publishes.
Framework: the single agreed generic change -- supervisor apply_enrichment now
MERGES into _enriched instead of overwriting, so the still-global geocoder phase
doesn't clobber the adapter's bundles. No other adapter writes _enriched, so this
is inert for them.
GUI: _event_summaries/nwis.html -> "<site> -- <value> <units> (<band>, <Nth>
percentile)", with graceful fallback to "<site> -- <value>" then the bare
"Water reading:". _event_rows/nwis.html detail gains site/normalcy/typical/location
rows. _events_rows.html Location column falls back generically to any
_enriched.<source> carrying state/county when the geocoder is null (works for
future enrichers). events.json contract unchanged (additions under _enriched only).
conftest isolate_enrichment_cache also redirects NWIS_CACHE_DB_PATH off the prod
path (unprivileged-user test isolation). Adds tests/test_nwis_enrichment.py (28
tests: parse, band edges incl P0/P9/P10/P75/P90/record, percentile interpolation,
cache hit/miss/expire, adapter enrich + graceful-null + cache-hit-no-refetch,
summary rendering per band).
Full suite: 710 passed, 1 skipped (central and unprivileged zvx, 3x each).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Central
Central is the data hub spine for the infrastructure. Adapters normalize upstream sources into a canonical event shape, publish CloudEvents to NATS/JetStream, and archive to TimescaleDB for historical query. Single-LXC deployment.
Status
Phase 0 — scaffold. Not yet operational.
Architecture
- Python 3.12 (uv-managed)
- NATS + JetStream for live event bus
- TimescaleDB + PostGIS for archive and geospatial query
- One supervisor process managing adapter lifecycle
- One archive consumer process persisting events to TimescaleDB
- Both processes systemd-managed
Testing
See docs/test-database.md for test database setup.
License
MIT. See LICENSE.