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[arianvp]

Checklist

• [ ] The PR Title explains the impact of the change.
• [ ] The PR description provides context as to why the change should occur and what the code contributes to that effect. This could also be a link to a JIRA ticket or a Github issue, if there is one.
• [ ] If end-points have been added or changed: the endpoint / config-flag checklist (see Wire-employee only backend wiki page) has been followed.
• [ ] If a schema migration has been added, I ran make git-add-cassandra-schema to update the cassandra schema documentation.
• [ ] Section Unreleased of CHANGELOG-draft.md contains the following bits of information:
  • [ ] A line with the title and number of the PR in one or more suitable sub-sections.
  • [ ] If /a: measures to be taken by instance operators.
  • [ ] If /a: list of cassandra migrations.
  • [ ] If public end-points have been changed or added: does nginz need upgrade?
  • [ ] If internal end-points have been added or changed: which services have to be deployed in a specific order?