It's a little weird that we need to put this here, since it means facebook metrics will only update once someone uploads a csv for a different channel.

From discussion in RL: A better way to do this would be for facebook to have its own variant of the metric summary view, and do the fire there, but since there is time pressure, the plan is instead to do the fire in a model save hook. This will at least ensure the fire happens when values are changed for facebook.