···8899- retains "backfill window" on local disk (using [pebble](https://github.com/cockroachdb/pebble))
1010- serves the `com.atproto.sync.subscribeRepos` endpoint (WebSocket)
1111+- proxies through public and administrative API requests to the backing host
1112- retains upstream firehose "sequence numbers"
1213- does not validate events (signatures, repo tree, hashes, etc), just passes through
1314- does not archive or mirror individual records or entire repositories (or implement related API endpoints)