Live display to show recent events for a station

(as reported in #12)

Near-live display of events.
Live-live is not possible because events are uploaded every ~5 minutes.
But near-live should be good enough.

- We may run into issues with reading data from the raw datastore.
    - Check that 1 writer, multiple readers is no issue.
- Nice station layout
    - [ ] Use canvas?
    - [ ] Use same code as will be made for #46 
- ...