Avoid huge relationships (observations, headers)
Using observations & headers collections in the interferometer & instrument views (to report their counts) is a performance bottleneck as the complete collection is retrieved in database to only count it !
Critical: opening obs.jmmc.fr/interferometer kills the server (6Gb exhausted!)
Use 0 now and use a dynamic query (or property) to issue the select count(*) from observation/header where id matches !!