DeltaChannelHistory()| Name | Type |
|---|---|
| writes | list[PendingWrite] |
| seed | NotRequired[Any] |
Per-channel result entry from BaseCheckpointSaver.get_delta_channel_history.
Storage-level view of what one channel contributed across the ancestor chain of a target checkpoint:
writes — on-path deltas oldest→newest as PendingWrite tuples.
Always present; possibly empty. Already filtered to one channel.
Writes stored at the target checkpoint itself are pending for the
next super-step and are excluded.seed — the stored value at the nearest ancestor whose
channel_values[ch] is populated. Omitted if the walk reached the
root without finding any stored value (consumer treats absence as
"start empty"). Typically a _DeltaSnapshot for delta channels with
finite snapshot frequency, or a plain value for threads migrated
from a pre-delta channel type.