Too many anniversaries - filesize exceeded?

[wulfmain]

I have a Birthday.yaml and around 600 entries like:

• name: 'Max Mustermann'
  date: '1979-07-01'

My Logfile says:

2025-08-19 08:14:26.742 WARNING (Recorder) [homeassistant.components.recorder.db_schema] State attributes for calendar.inbox exceed maximum size of 16384 bytes. This can cause database performance issues; Attributes will not be stored

Looks like the filesize is too big - is there a solution/workaround