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gods-eye-view/changelog.d/686-terrain-heights-bounds.md
daikaginza 558b0275a4 docs(changelog): move the entry into a changelog.d fragment
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2026-10-18 13:36:06 +07:00

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- Bound what a caller can grow through `/api/terrain/heights`. Every distinct
5-decimal point was a permanent in-memory entry, a permanent line in an
uncapped `.gev-cache/terrain-heights.json`, and a live upstream call, with
nothing limiting the rate. The point cache now holds at most 50,000 entries
and evicts oldest-first, a cache file above
24 MB is not read back, and the route is limited to 90 requests/minute per
client (270 global). Evicting a point costs one refetch, never a wrong
answer, since terrain does not move. Ordinary use is unaffected: a full
`test:track` run drives 10 requests, peaking at 8/min (daikaginza, #686).