compaction schedule at database level

[NOTE]: # ( ^^ Provide a general summary of the request in the title above. ^^ )

## Summary

[NOTE]: # ( Provide a brief overview of what the new feature is all about. )

## Desired Behaviour

[NOTE]: # ( Tell us how the new feature should work. Be specific. )
[TIP]: # ( Do NOT give us access or passwords to your actual CouchDB! )

## Possible Solution

[NOTE]: # ( Not required. Suggest how to implement the addition or change. )

## Additional context

[TIP]: # ( Why does this feature matter to you? What unique circumstances do you have? )

The issue contains only the title and an unfilled request template, with no files, tests, or entry points identified. Clarify the desired database-level scheduling behavior and acceptance criteria before locating the relevant CouchDB implementation and defining what done means.

Written by the indexing model from the issue text.