TODOs

Allocations

Staff can book devices in the future
- Form layout:
```
User ID           [______]
---
(if allocating normally)
Allocation End    [datetime picker | hh:mm from now]
(if scheduling allocation)
Allocation Start  [datetime picker]
Allocation End    [datetime picker w/ durations]
---
Device ID Match   [ID | List of IDs (selecty thing) | Group]
Number of Devices [__ | all]
```
  - Allow repeats?
    - Future version (non-core functionality)
- Set aside devices immediately
  - If allocating from group, don't allocate specific devices immediately, just attach the allocation to the group instance and reserve correct number of devices
    - calculate remaining unallocated devices in group on-the-fly
  - print out ticket w/ allocation ID + barcode?
- Allocating all requires special privilege/checkbox or something.
- Notify if allocation is not possible.
  - When to notify?
  - How would this happen?
Groups
- Each device is in exactly one group
- Each group is in a parent group
  - How to implement root group?
- When allocating individual device, must use ID
- When allocating in bulk, can use a group — will pick any available device from group (including children).
  - Can visualise group health (how?)
Need to make sure all the words used are the right ones!

Borrower has many loans and many allocations.
Loan has a recipient (borrower|allocation) and a device.
Allocations have one borrower and many loans.