Farcaster Devs

i have my hub running

i want to extract from its current state all the casts that meet a certain condition (let's say they have the string $bleu inside its text), and save all those casts on on that same machine

how would you do this?

what's the equivalent of a for loop to check all this info?

There's one way to do that but I am new to farcaster so maybe there's way easier solutions than mine:
1) Install a postgres db and shuttle to replicate all hub data to a database.
2) Add an index to casts.text column. (https://www.postgresql.org/docs/current/textsearch.html)
3) You can now find anything you need with SQL queries.