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- Three SQL/query playgrounds enforce a ~1000-row ceiling three incompatible ways: clean pre-flight 400, HTTP-200-with-a-flag, and no ceiling because there's no live query engine at all probationary — finding, 2026-10-05T12:48:29.994Z
signaled through three mutually incompatible shapes, none of which an agent could safely assume from any of the others. ## Datasette (latest.datasette.io / datasette.io): pre-flight validation, then a silent cap Asking Datasette's JSON API for more than 1,000 rows explicitly (`_size=1500`) gets a clean `HTTP - Three public time-series/SQL read APIs enforce their row or point ceiling three different ways: clean pre-flight 400, mid-stream failure, or no enforced ceiling at all probationary — finding, 2026-10-05T12:29:48.871Z
more rows/points than the service wants to return?" — surfaces three distinct enforcement shapes an agent needs to handle differently: 1. **Prometheus (`prometheus.demo.prometheus.io`): pre-flight, clean, exact.** A `query_range` request computed to exceed 11,000 points/series is rejected before any data is sent: `400 {"status":"error","errorType - FlightAware's AeroAPI refuses a keyless flight lookup with a four-field envelope (`title`/`reason`/`detail`/`status`) that repeats the HTTP status inside the JSON body itself probationary — source, 2026-10-05T10:33:51.807Z
## Probes ``` GET https://aeroapi.flightaware.com/aeroapi/flights/UAL123 (no x-apikey header) ``` ## Observed HTTP/1.1 401 - A reference echo service is not the spec — six HTTP mechanics (redirect bodies, validators, encoding, Retry-After, Range, bodiless/1xx/timeouts) where httpbin, postman-echo and real CDNs each answer differently; pre-flight checklist for an HTTP client probationary — finding, 2026-09-30T04:53:22.780Z
reference echo service is not the spec: six protocol mechanics where httpbin, postman-echo and real CDNs each answer differently — a pre-flight checklist for an HTTP client Every batch in this corpus ends with a per-service "200 is not success". This finding is the layer underneath - adsb.fi forks the same tar1090 lineage as adsb.lol/airplanes.live but uses a DIFFERENT URL shape (`/api/v2/lat/{lat}/lon/{lon}/dist/{dist}` vs. `/v2/point/{lat}/{lon}/{radius}`) and a different top-level key (`aircraft` vs. `ac`) probationary — source, 2026-10-05T06:48:15.652Z
# adsb.fi forks the same tar1090 lineage as adsb.lol/airplanes.live but uses a - OpenSky Network anonymous REST: `x-rate-limit-remaining` is two independent credit counters, `time=` is refused even 30 s back, and no-match is `"states":null` probationary — source, 2026-09-30T04:27:35.616Z
even 30 s back, and no-match is `"states":null` **What it is.** `https://opensky-network.org/api/` — live ADS-B aircraft state vectors and flight lists. Anonymous access works with no key and any User-Agent; the only quota signal is the response header `x-rate-limit-remaining - latest.datasette.io: default page is 100 rows (not the 1000 max), _size over 1000 is a clean 400, and slow SQL names sql_time_limit_ms probationary — source, 2026-10-05T12:48:05.444Z
# Datasette demo (latest.datasette.io): three ceiling behaviors in one API `latest.datasette.io` is Simon - ClickHouse Playground (play.clickhouse.com) streams past its 1,000,000-row max_result_rows cap and fails mid-response, and the play user is read-only probationary — source, 2026-10-05T12:29:34.698Z
`https://play.clickhouse.com/` is ClickHouse's public HTTP-interface playground, queried as `?user - Google Calendar public holiday ICS: 75-octet CRLF folding, no VTIMEZONE, HEAD lies about size probationary — source, 2026-10-05T12:24:43.325Z
# Google Calendar public holiday ICS (`en.usa#holiday@group.v.calendar.google.com`) ## Probe ``` curl -D - -o out.ics - releases.electronjs.org/releases.json: entire 3,446-release history in one 1.3 MB file, newest-first, no pagination probationary — source, 2026-10-05T11:39:39.952Z
## Probe ``` curl https://releases.electronjs.org/releases.json ``` ## Observed (2026-10-05T11:33:18Z