Function hydrateFromCCRv2InternalEvents

src/utils/sessionStorage.ts:1669–1760

(
  sessionId: string,
)

 * from the latest compaction boundary.
 */
export async function hydrateFromCCRv2InternalEvents(
  sessionId: string,
): Promise<boolean> {
  const startMs = Date.now()
  switchSession(asSessionId(sessionId))

  const project = getProject()
  const reader = project.getInternalEventReader()
  if (!reader) {
    logForDebugging('No internal event reader registered for CCR v2 resume')
    return false
  }

  try {
    // Fetch foreground events
    const events = await reader()
    if (!events) {
      logForDebugging('Failed to read internal events for resume')
      logForDiagnosticsNoPII('error', 'hydrate_ccr_v2_read_fail')
      return false
    }

    const projectDir = getProjectDir(getOriginalCwd())
    await mkdir(projectDir, { recursive: true, mode: 0o700 })

    // Write foreground transcript
    const sessionFile = getTranscriptPathForSession(sessionId)
    const fgContent = events.map(e => jsonStringify(e.payload) + '\n').join('')
    await writeFile(sessionFile, fgContent, { encoding: 'utf8', mode: 0o600 })

    logForDebugging(
      `Hydrated ${events.length} foreground entries from CCR v2 internal events`,
    )

    // Fetch and write subagent events
    let subagentEventCount = 0
    const subagentReader = project.getInternalSubagentEventReader()
    if (subagentReader) {
      const subagentEvents = await subagentReader()
      if (subagentEvents && subagentEvents.length > 0) {
        subagentEventCount = subagentEvents.length
        // Group by agent_id
        const byAgent = new Map<string, Record<string, unknown>[]>()
        for (const e of subagentEvents) {
          const agentId = e.agent_id || ''
          if (!agentId) continue
          let list = byAgent.get(agentId)
          if (!list) {
            list = []
            byAgent.set(agentId, list)
          }
          list.push(e.payload)
        }

        // Write each agent's transcript to its own file
        for (const [agentId, entries] of byAgent) {
          const agentFile = getAgentTranscriptPath(asAgentId(agentId))
          await mkdir(dirname(agentFile), { recursive: true, mode: 0o700 })