hydrant
very fast at protocol indexer with flexible filtering, xrpc queries, cursor-backed event stream, and more, built on fjall
rust fjall at-protocol atproto indexer
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Version history of src/control/mod.rs

July 2026

ptr.pet
[control] add sequential collection block scan API
committed

June 2026

ptr.pet
[all] fmt
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ptr.pet
[all] split and reorganize code
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ptr.pet
[backfill] initial sparse repo backfill implementation
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ptr.pet
[ingest] add stats for relay worker shards
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ptr.pet
[relay] improve how host connections with stale cursors get treated, hopefully fix a nasty bug with message deduping that caused connections to stall, more debugging
committed

May 2026

ptr.pet
[lib] user-keyspace feature for letting users open keyspaces in hydrant db
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ptr.pet
[jetstream] introduce jetstream compatible endpoint for indexer and relay
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ptr.pet
[tests] improve test times, split and rename some tests
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ptr.pet
[ingest] add sharded mailbox
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oyster.cafe
[hydrant] clippy fixes
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oyster.cafe
Binding multiple listen addresses
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ptr.pet
[backfill] dont hold store / mst tree over db commit, drop early when we can
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April 2026

ptr.pet
[lib] expose backlinks properly, add dids field support
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ptr.pet
[db] make count tracking more durable
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ptr.pet
[docs] update verbiage to latest (redirect fix)
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ptr.pet
[firehose] periodically retry offline hosts (every 30 minutes)
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ptr.pet
[lib,api] add new host limit for hosts added via requestCrawl
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ptr.pet
[all] add indexer_stream feature to decouple the events stream from the indexer
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ptr.pet
[all] dont thread ephemeral bool through the code, use from app state
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ptr.pet
[indexer] add config option for only indexing links
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ptr.pet
[firehose] jitter connection startup when we are spawning persisted / configged firehoses
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ptr.pet
[ingest,lib,api] implement host status tracking for pds' and enforce account limit
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ptr.pet
[lib,api,firehose] let pds' be bannable
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ptr.pet
[lib,api] return account count when querying host status
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ptr.pet
[all] re-organize types and feature gates
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March 2026

ptr.pet
[firehose] throttle hosts on certain errors, improve backoff
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ptr.pet
[seed] implement seeding firehose sources from relay listHosts
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ptr.pet
[relay] ratelimits, ratelimit tiers and management
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ptr.pet
[all] internal relay backed indexer
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ptr.pet
[ingest,lib,api] relay mode, sync fixes
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ptr.pet
[ingest] host authority validation for pds'
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ptr.pet
[ingest] sync validation pass
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ptr.pet
[lib,api,db] implement getHostStatus, listHosts and add db migrations
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ptr.pet
[lib,api] implement getting mini doc, blue.microcosm.identity.resolveMiniDoc and custom describeRepo
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ptr.pet
[api,lib] implement iter in ReposControl, remove partition argument from /repos
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ptr.pet
[docs] clarify comments, add links to vs-tap sections in readme
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ptr.pet
[lib] split into multiple modules
committed