The report of a visitor that a drop point needs maintenance. When visitors find a drop point needing maintenance, they may report the dr

A physical location of a drop point at some point in time. Drop points may be relocated at any time for whatever reason. For analysis af

The User class represents a user that can access the web interface. Each user has a login (i.e. user name), a password and may have the right

A maintenance visit of bottle collectors at a drop point. After a report of a problem with a certain drop point has been generated or a

A location in the venue for visitors to drop their empty bottles. A drop point consists of a sign "bottle drop point <number>" at the wa

A category of drop points for different stuff, e.g. bottles, trash, etc. Different categories of drop points allow different teams or specia