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fix(forwarder): preserve Cursor fork context

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Store checkpoint turns as validated blobs and restore prefetched parent turns so forked conversations retain their replay history and rewind prefix.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
DedSecer
2026-08-01 10:51:23 +08:00
co-authored by Cursor
parent 00f52166b2
commit 14b286a466
14 changed files with 1979 additions and 304 deletions
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internal/backend/forwarder/rewind.go
+23 -2
View File
@@ -36,7 +36,7 @@ type runRewindMatch struct {
}
func (service *Service) decideRunRewind(intent InboundIntent, conversation *ConversationFile) runRewindDecision {
decision := runRewindDecision{ClientTurnCount: -1}
decision := runRewindDecision{}
if !shouldEvaluateRunRewind(intent) {
return decision
}
@@ -121,7 +121,7 @@ func selectRunRewindMatch(matches []runRewindMatch, clientTurnCount int, hasClie
if len(matches) == 0 {
return runRewindMatch{}, "no_match"
}
if hasClientTurnCount && clientTurnCount >= 0 {
if hasClientTurnCount {
targetTurnSeq := int64(clientTurnCount) + 1
for _, match := range matches {
if match.Entry.TurnSeq == targetTurnSeq {
@@ -224,6 +224,7 @@ func (service *Service) applyRunRewindToConversation(conversation *ConversationF
conversation.Entries = nil
conversation.NextEntrySeq = 1
conversation.NextTurnSeq = 1
conversation.ImportedTurnIDs = rewindImportedTurnPrefix(conversation.ImportedTurnIDs, decision)
appendEntriesInPlace(conversation, appendReplacementRunEntries(decision.PrefixEntries, entries))
applyRunRewindConversationState(conversation, intent, turnSeq)
deriveConversationLoopState(conversation)
@@ -266,10 +267,30 @@ func applyRunRewindMetadata(conversation *ConversationFile, source *Conversation
if source.TokenDetailsMaxTokens > 0 {
conversation.TokenDetailsMaxTokens = source.TokenDetailsMaxTokens
}
decision := runRewindDecision{TargetTurnSeq: turnSeq}
if intent.ConversationState != nil {
decision.HasClientTurnCount = true
decision.ClientTurnCount = len(intent.ConversationState.GetTurns())
}
conversation.ImportedTurnIDs = rewindImportedTurnPrefix(source.ImportedTurnIDs, decision)
}
applyRunRewindConversationState(conversation, intent, turnSeq)
}
func rewindImportedTurnPrefix(importedTurnIDs [][]byte, decision runRewindDecision) [][]byte {
keep := decision.TargetTurnSeq - 1
if decision.HasClientTurnCount {
keep = int64(decision.ClientTurnCount)
}
if keep <= 0 || len(importedTurnIDs) == 0 {
return nil
}
if keep > int64(len(importedTurnIDs)) {
keep = int64(len(importedTurnIDs))
}
return cloneByteSlices(importedTurnIDs[:keep])
}
func (service *Service) logRunRewindDecision(requestID string, conversationID string, eventName string, decision runRewindDecision) {
if service == nil || !decision.Evaluated {
return