Unpin stale pool data from IPFS

[snreynolds]

[NoahZinsmeister]

we're spamming pinata a bit with unused pool caches - first order of business should be to manually unpin all existing caches older than a day (?) or so - api docs are here https://docs.pinata.cloud/

next we should set up another cron job to purge caches on, again, a daily or so basis

beyond that, the only thing to look out for is that we aren't nuking anything else other than pool caches - should make sure that we're filtering appropriately to only unpin those

[snreynolds]

script ready whenever we want to delete old data. longer term going to have @zhongeric write a cron job for this in routing-api.