Method getExistingSessionFile

src/utils/sessionStorage.ts:1315–1337

(
    sessionId: UUID,
  )

   */
  private existingSessionFiles = new Map<string, string>()
  private async getExistingSessionFile(
    sessionId: UUID,
  ): Promise<string | null> {
    const cached = this.existingSessionFiles.get(sessionId)
    if (cached) return cached

    const targetFile = getTranscriptPathForSession(sessionId)
    try {
      await stat(targetFile)
      // Evict oldest entry when at capacity so the Map stays bounded
      if (this.existingSessionFiles.size >= MAX_CACHED_SESSION_FILES) {
        const oldestKey = this.existingSessionFiles.keys().next().value
        if (oldestKey !== undefined) {
          this.existingSessionFiles.delete(oldestKey)
        }
      }
      this.existingSessionFiles.set(sessionId, targetFile)
      return targetFile
    } catch (e) {
      if (isFsInaccessible(e)) return null
      throw e
    }
  }

  private async persistToRemote(sessionId: UUID, entry: TranscriptMessage) {
    if (isShuttingDown()) {