Add automatic session migration when switching from SDK to Native mode

packages/ui/src/stores/session-api.ts

@@ -3,6 +3,7 @@ import type { Message } from "../types/message"
 
 import { instances } from "./instances"
 import { nativeSessionApi } from "../lib/lite-mode"
+import { needsMigration, migrateSessionsToNative, markMigrated, getExistingSdkSessions } from "./session-migration"
 import { preferences, setAgentModelPreference, getAgentModelPreference } from "./preferences"
 import { setSessionCompactionState } from "./session-compaction"
 import {
@@ -389,6 +390,26 @@ async function fetchSessions(instanceId: string): Promise<void> {
     let responseData: any[] = []
 
     if (isNative) {
+      // Check if we need to migrate sessions from SDK mode
+      if (needsMigration(instanceId)) {
+        const existingSdkSessions = getExistingSdkSessions(instanceId)
+        if (existingSdkSessions.length > 0) {
+          log.info({ instanceId, count: existingSdkSessions.length }, "Migrating SDK sessions to native mode")
+          const migrationData = existingSdkSessions.map(s => ({
+            id: s.id,
+            title: s.title,
+            parentId: s.parentId,
+            time: s.time,
+            model: s.model,
+            agent: s.agent
+          }))
+          const result = await migrateSessionsToNative(instanceId, migrationData)
+          log.info({ instanceId, result }, "Migration completed")
+        } else {
+          markMigrated(instanceId)
+        }
+      }
+
       const nativeSessions = await nativeSessionApi.listSessions(instanceId)
       responseData = nativeSessions.map(s => ({
         id: s.id,