Feature Request: Graphs for Metrics

[SimonGodefroid]

As a business owner of shortnr

I want to have a real time graph below shortnr text area

with the following metrics:

• number of characters spared (just for fun)
• number of url shortened
• number of shortened urls that have been accessed
• average length of shortened urls

[eveningkid]

@SimonGodefroid I believe this could overload the server as not every user needs to know about these metrics. Although it's fun, maybe this should go on a separate page? On a /metrics route maybe?

Also, maybe they could be periodically computed, then cached (is real time really necessary?).

@Pegase745 any input on this?