Runs the segment for the authenticated user and returns immediately with a run
reference and its status; it does not wait for the segment run to finish. The
run only covers the companies the token's user can access in Silverfin, and
never changes the segment's definition.

If a run of this segment is already in progress, no new run is started: the
response describes that pending run: the pending payload documented on
GET /segments/{id}/results, without its message. Poll that endpoint
until it finishes. Otherwise a new execution is
created (a 202) and any previously generated results are discarded.

A firm can have a limited number of runs in progress at the same time;
further requests are rejected with a 409 until a run
finishes. Runs started from the Silverfin UI count towards that limit.
Only the firm's own segments can be run through the API; recommended
segments cannot.

This endpoint exists in API v4 only; on the deprecated v3 API it returns a 404.

This endpoint requires a user OAuth token and Insights Premium.

Required scope: insights:write