Does the incident filterset OR or AND its arguments?

[hmpf]

We need to verify what the filterset does when given more than one flag: OR or AND. We want AND most of the time.

Originally posted by @hmpf in #206 (comment)

[hmpf]

django_filters.filterset.filter_queryset() runs the filters in a loop.

/api/v2/incidents/?acked=true&stateful=true wind up callingl queryset.acked().stateful(). This is equivalent to

'SELECT "argus_incident_incident"."id", "argus_incident_incident"."start_time",
"argus_incident_incident"."end_time","argus_incident_incident"."source_id", 
"argus_incident_incident"."source_incident_id", "argus_incident_incident"."details_url", 
"argus_incident_incident"."description", "argus_incident_incident"."level",
"argus_incident_incident"."ticket_url" FROM "argus_incident_incident" 
WHERE (
  "argus_incident_incident"."id" IN (
    SELECT DISTINCT U1."incident_id" FROM "argus_incident_acknowledgement" U0 
      INNER JOIN "argus_incident_event" U1 ON (U0."event_id" = U1."id"
    ) WHERE NOT (U0."expiration" <= 2022-03-07 11:33:15.190594+00:00 AND U0."expiration" IS NOT NULL)
  )
  AND "argus_incident_incident"."end_time" IS NOT NULL
)
ORDER BY "argus_incident_incident"."start_time" DESC'

So: filterset works with AND.