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Content SEO pages keyed derived-payload cache validity on
history_token = PAYLOAD_VER:hist_end, computed from the fully-loaded
~45-year archive. Every hourly tail top-up advanced hist_end and
invalidated the whole content cache for a cell, and computing the token
at all required loading the full history first — so even cache hits paid
the full load.
Add content_token(cell_id) = PAYLOAD_VER:CONTENT_VER:max_date, keyed on
the archive's newest DATE read cheaply without loading history:
climate_store.history_max_date does an indexed MAX(date) over the
(cell_id, date) PK on Postgres; climate.history_max_date dispatches to it
or to a single-column scan of the cached parquet on the dev backend. The
token survives intra-day top-ups and turns over only when the last
archived day advances (~1x/day), keeping content pages <=1 day stale.
Fail-soft: a store/DB error buckets to 'none' rather than raising.
CONTENT_VER ("c1") is a separate content-shape version so a content-only
change need not orphan every other kind's cache.
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| .. | ||
| test_internal_routes.py | ||
| test_internal_token_derivation.py | ||
| test_payloads.py | ||