Forward raw readsb JSON to the stats endpoint on a dedicated timer#143
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Add airplanes-stats.sh and its 120s systemd timer to upload the forwarder's raw aircraft/stats/outline readsb JSON, gzip-encoded, to the backend, which extracts per-feeder reception metrics. Rides the existing REPORT_STATUS consent, validates each document independently, skips stale or oversize snapshots, and is best-effort (a failed push never flaps the unit). Adds post_gzip_bearer for Content-Encoding: gzip uploads and a shared report_status_consent resolver in common.sh.
The feeder-attested stats lane moved to airplanes-stats.sh, so remove build_reception_json and the /api/feeders/reception POST from the diagnostics run. Resolve REPORT_STATUS via the shared report_status_consent helper so the privacy fail-closed rule is single-sourced.
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Feeders now upload their raw readsb JSON (aircraft, stats, and range-outline documents) to the backend roughly every two minutes on a dedicated
airplanes-statstimer. The server derives the per-feeder reception statistics from those documents, so new statistics can be added on the server without updating the fleet.This replaces the earlier approach where a handful of computed scalars were posted alongside diagnostics. The diagnostics push is now device-health only; the stats upload runs on its own timer and lane.
The upload reuses the existing reporting-consent toggle, validates each document on its own (a missing or half-written file is skipped, never sent as a fragment), drops stale snapshots, and is strictly best-effort — a failed push is logged and retried on the next tick, never failing the unit. Bodies are gzip-encoded and bounded to the server's size limits, dropping the optional outline document before skipping if a dense receiver would exceed them.