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fix: list GitHub App installations instead of per-org lookups - #446
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Orgs without an installation repeated two lookup calls on every request.
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Orgs without an installation for the app repeated up to two installation lookups on every request before falling back to the fallback org token. That came to about 270k lookup_installation calls a day in production, most of cachew's GitHub API traffic.
Each app now lists its installations from /app/installations at startup and every five minutes, and lookups are answered from that set (case-insensitive). Orgs without an installation go straight to the fallback token with no API call. A failed refresh keeps the last known set. The rate-limit poller now covers every listed installation, and the api_calls metric reports list_installations instead of lookup_installation.