Remove pipelinekey

[c-w]

We query the table like so:

    SELECT *
    FROM fortis.events
    WHERE eventid = ?
    LIMIT 2

When we query the table, we don't know what pipeline the event came from (it's in the messages schema event endpoint which just retrieves an event by id). This means that either we have to ALLOW FILTERING here or we must remove the pipelinekey from the table primary key. Given that the eventids will be unique (we generate them in Spark), I don't see an issue with just removing the pipelinekey here.

[jcjimenez]

LGTM