Field cohort_definition_id in table cohort_definition should be a primary key. #772

The field cohort_definition_id in table cohort_definition should be a primary key. The issue is present with version 5.3, and 5.4 (see below), and version 6.0 might introduce another issue (see further below).

5.3

5.4

6.0

Version 6.0 indicates that cohort_definition_id is a foreign key from the field/column cohort_definition_id in table table cohort (where it is not a primary key). Should it be the other way around (field/column cohort_definition_id in table table cohort is a foreign key from cohort_definition.cohort_definition_id?