Stellar RPCs forget after about 7 days. Sierpe does not.
It is a self-hosted indexer: register a contract and it backfills the complete history into your own Postgres, behind an honest REST API.
21 releases since August. Here is where it stands:

ALT Timeline from genesis to the network tip. A long band labeled History Archives, replayed through captive core, covers almost all of it; a short band at the tip is labeled RPC, about 7 days. An arrow shows the backfill walking backwards from the day a contract is registered. Caption: before writing a healed ledger, the replay must match the RPC byte for byte.