Database life cycle management

[uniqueg]

Is your feature request related to a problem? Please describe.
Currently data is stored in the database indefinitely. But depending on the use case, this may not always be desired by a given user/administrator. Users/admins thus should have the option to clean up the database, and relevant parameters should be configurable.

Describe the solution you'd like
Implement a service that periodically checks records in database collections and deletes records that are too old. Alternatively, or in addition, old records exceeding a specified limit of records are automatically deleted upon given operations (such as a POST request to the /runs API endpoint). Add relevant parameters (periodicity of checks/delete operations, maximum number and/or maximum age of records etc.) to config file app/config.yaml.

Describe alternatives you've considered
None, at this point.

Additional context
Not applicable.

[uniqueg]

MongoDB supports capped collections, by size and by number of documents. See here: https://docs.mongodb.com/manual/reference/method/db.createCollection/
In case of overflow, the oldest records are removed first.