Notifications not getting expunged.

**Describe the bug**
Notifications are not being removed after a time period as intended per batman.

**To Reproduce**
Steps to reproduce the behavior:
1. Exist

**Expected behavior**
Notifications should be removed after a period of time.

**Environment:**
- All

**Additional context**
Posted as requested by batman to remember to fix later.

No file, test, or entry point is named. First locate where notification expiration is handled and determine how to reproduce the missing removal; done means notifications are removed after the intended period and the behavior is covered by a relevant check.

Written by the indexing model from the issue text.