Pollution v2 elaboration not advancing

[clezag]

The new pollution v2 elaboration has an issue where it doesn't advance even though the task is running.
To make it run again, it's necessary to delete the Redis volume and restart the service.
It will then elaborate up to that date, but get stuck there again.

In addition, it looks like it caches the list of stations it elaborates indefinitely, and hence does not detect newly added stations without a restart.