reporting: Basic reporting skeleton
All reports require parameters for start and end date of the report
Financial report
- number of issued fines and their total sum
- number of paid fines and their total sum
- number of waiting fines and their total sum
Book report
- number of books borrowed
- number of books returned
User report
- number of new users (per type)
- total number of users (per type)<
Implement controllers only, values can be mocked (static) for now.