Hangfire.SqlServer no job foreign key relation in JobQueue table

Hangfire.Core: 1.6.8
Hangfire.SqlServer: 1.6.8

After deleting all jobs from the Job table I detected that the job queue was not cleared.
The BackgroundJobServer keeps trying to retrieve the not existing jobs.
Is there a reason this column does not have a foreign key? If not, can you please add it?

Inspect the Hangfire.SqlServer schema and migrations for the Job and JobQueue tables, then reproduce deleting all jobs while a BackgroundJobServer is running. Determine the intended relationship and verify that the resulting schema and deletion behavior no longer leave queue entries for missing jobs.

Written by the indexing model from the issue text.