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fix(unified-sessions): stop the firstPrompt workingDir backfill from cross-contaminating history rows

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COD-140's backfill was meant to cover live/persisted rows whose Codeman
id doesn't match an on-disk transcript UUID, guessing from the newest
transcript in the same workingDir as a last resort. It was also firing
for pure history rows whose OWN transcript scan already ran (and
genuinely found nothing, e.g. an oversized first message) -- those got
silently backfilled with the newest OTHER session's opening line from
the same directory. Not a blank row, but actively wrong: old sessions
displayed a completely unrelated (often today's live) conversation's
first prompt as if it were their own.

Skip the workingDir guess for any item that already has its own
'history' source -- it already had a real, direct attempt. Rows with
no history source at all (their transcript isn't linked/scanned under
their own id yet) still get the guess, matching the original intent.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
timkjr
2026-08-05 11:11:18 -05:00
co-authored by Claude Sonnet 5
parent e888c65c52
commit a2aed38073
2 changed files with 46 additions and 2 deletions
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src/services/unified-session-service.ts
+13 -2
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@@ -226,6 +226,16 @@ export function mergeUnifiedSessions(sources: UnifiedSources): UnifiedSessionIte
// different UUID. Backfill from the already-passed history: first try the claudeSessionId
// join, then the newest transcript in the same workingDir. Never overwrite a non-empty
// firstPrompt (so rows keyed to their own transcript are untouched).
//
// The workingDir guess is a last resort and MUST be skipped for any item that
// already has its own 'history' entry (step 1 above already gave it a real,
// direct scan of its own transcript). Without this guard, a history row whose
// OWN extraction genuinely failed (oversized first message, etc.) silently
// inherited the newest OTHER session's opening line from the same directory —
// not a blank, but actively wrong: old sessions displayed today's conversation
// as if it were their own. A row with no 'history' source at all (its
// transcript hasn't been linked/scanned under its own id yet) has no such
// direct attempt to prefer, so the guess remains a reasonable stand-in there.
const firstPromptByUuid = new Map<string, string>();
const firstPromptByWorkingDir = new Map<string, { prompt: string; ms: number }>();
// COD-145: lastPrompt rides the same backfill (build parallel indexes; never overwrite).
@@ -254,12 +264,13 @@ export function mergeUnifiedSessions(sources: UnifiedSources): UnifiedSessionIte
}
}
for (const item of map.values()) {
const hasOwnHistoryEntry = item.sources.includes('history');
if (!item.firstPrompt) {
// never overwrite an existing non-empty prompt
const byUuid = item.claudeSessionId ? firstPromptByUuid.get(item.claudeSessionId) : undefined;
if (byUuid) {
item.firstPrompt = byUuid;
} else if (item.workingDir) {
} else if (item.workingDir && !hasOwnHistoryEntry) {
const byDir = firstPromptByWorkingDir.get(item.workingDir);
if (byDir) item.firstPrompt = byDir.prompt;
}
@@ -268,7 +279,7 @@ export function mergeUnifiedSessions(sources: UnifiedSources): UnifiedSessionIte
const byUuid = item.claudeSessionId ? lastPromptByUuid.get(item.claudeSessionId) : undefined;
if (byUuid) {
item.lastPrompt = byUuid;
} else if (item.workingDir) {
} else if (item.workingDir && !hasOwnHistoryEntry) {
const byDir = lastPromptByWorkingDir.get(item.workingDir);
if (byDir) item.lastPrompt = byDir.prompt;
}