[Monitoring] Add automatic size limit for database

[codie3611]

The database should be limited to a certain size. If the size is exceeded old events should be deleted. To make this consistent we should create another table with the state at the beginning before all update events. When the database is compressed all events should be processed and the starting table must be updated.

As limits it would be great to have to options:

• time limit
• database size limit

[codie3611]

Doesn't seem to be necessary even after monitoring for a month the data usage stays relatively healthy.