Warn user if data is older than some period

[AvverbioPronome]

Sometimes it happens I see there are available bikes, but then I see that the last update is 24 hours old. This confuses me.

The app should at least warn me or autoupdate the bike data.

[mirh]

As long as there is network connection, the program updates basically whenever I do anything (after some fairly short time since last time).
If any an issue I noticed, is that nothing changes in the "map view", unless you cycle back and forth.