ReadonlyclientReadonlykeyReadonlyscanDelete all checkpoints and writes associated with a specific thread ID.
The thread ID whose checkpoints should be deleted.
Walk the parent chain returning per-channel writes + seed, used to
reconstruct DeltaChannel state from checkpoint_writes.
For each requested channel, walks ancestors of the checkpoint identified
by config (following parentConfig) and accumulates the pending writes
for that channel. The walk terminates per-channel at the nearest ancestor
whose channel_values[ch] is populated; that value is returned as seed.
If the walk reaches the root without finding a stored value, seed is
omitted from that channel's entry — the consumer treats the absence as
"start empty".
Walks the parent chain (not list({ before })): for forked threads, only
on-path ancestors contribute.
The default implementation walks getTuple + parentConfig once for all
channels — each ancestor visited once, not once per channel. Savers with
direct storage access (e.g. MemorySaver) override for performance; the
return contract is fixed here.
Channel names to walk for. Empty → empty mapping.
Configuration identifying the target checkpoint.
Per-channel DeltaChannelHistory for every requested name.
Generate the next version ID for a channel.
Default is to use integer versions, incrementing by 1. If you override, you can use str/int/float versions, as long as they are monotonically increasing.
Store intermediate writes linked to a checkpoint.
Prevent JSON.stringify from traversing backend clients (e.g. pg Pool
timers) when a checkpointer is present in runnable configurable.
Durable, epoch-fenced LangGraph.js checkpoint saver backed by FerricStore.