Fix the fetching of the active users

"More than 1000 expressions in a list are not allowed on Oracle." One can't bind the arrays bigger than 1000 elements in a IN or NOT IN expressions, however fetching the same amount or bigger via SLQ is allowed. Thus, the previous solution where subquery was used needs to be reapplied.

created branch 5-fix-the-fetching-of-the-active-users to address this issue

mentioned in merge request !9 (merged)

mentioned in commit 12d01086

closed with merge request !9 (merged)