优化底层游标索引性能；优化HTTPAPI索引逻辑；优化导出图片的索引写入逻辑

electron/main.ts

@@ -2390,6 +2390,8 @@ function registerIpcHandlers() {
     allowStaleCache?: boolean
     preferAccurateSpecialTypes?: boolean
     cacheOnly?: boolean
+    beginTimestamp?: number
+    endTimestamp?: number
   }) => {
     return chatService.getExportSessionStats(sessionIds, options)
   })
@@ -3935,4 +3937,3 @@ app.on('window-all-closed', () => {
 
 
 
-