Is it possible to avoid session timeouts?

Anvil Q&A
4

Also another option to make it user friendly that I’ve used in the past - Custom Error Handling

https://anvil.works/docs/client/python/error-reporting

You could implement this in addition to the suggestion from @david.wylie

from anvil import set_default_error_handling
from anvil.js import window

def error_handler(err):
  if isinstance(err, anvil.server.SessionExpiredError):
    alert(
        'Your session has timed out. Please refresh the page to continue', 
        title='Session Expired' , 
        buttons=[('Refresh Now', None)],
        dismissible=False
    )
    try:
      anvil.server.reset_session()
    except:
      window.location.reload()
  else:
    alert(err.args[0], title="Error")
    # or raise err

set_default_error_handling(error_handler)