Merge #686 head 558b0275 so its entry lives in changelog.d

#686 moved its changelog entry from CHANGELOG.md into
changelog.d/686-terrain-heights-bounds.md. Take #686's side so this
branch no longer edits CHANGELOG.md directly and no longer conflicts
with #686.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Said TurkseverandClaude Opus 5.5 committed 2026-10-19 13:56:15 +01:00
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# Changelog
- 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.
- The tracked-aircraft descriptor now publishes `verticalRateMps`, on both the
civil and military layers, so a consumer reading `getTrackedInfo()` no longer
has to reach past it into the raw poll record for climb/descent. Reported,
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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).