调整导出 CSV 格式，移除 recordId 和 timestamp，时间单位改为毫秒；优化图表显示逻辑，默认隐藏原始和滤波码值

app/api/export/route.ts

@@ -48,20 +48,21 @@ export async function POST(req: NextRequest) {
       })
     }
 
-    // CSV
-    let csv = 'recordId,timestamp,index,timeSec,code,force\n'
+    // CSV（去掉 recordId、timestamp，timeSec 改为毫秒单位）
+    let csv = 'index,timeMs,code,force\n'
     for (const r of rows) {
-      let step = r.sample_count > 0 ? r.duration / r.sample_count : 0
+      // 以毫秒为单位的步长
+      let stepMs = r.sample_count > 0 ? (r.duration * 1000) / r.sample_count : 0
       if (r.rec_start_ms != null && r.rec_end_ms != null && r.sample_count > 0) {
         const dtMs = Number((r.rec_end_ms as bigint) - (r.rec_start_ms as bigint))
-        if (Number.isFinite(dtMs) && dtMs > 0) step = dtMs / 1000 / r.sample_count
+        if (Number.isFinite(dtMs) && dtMs > 0) stepMs = dtMs / r.sample_count
       }
       const hasFit = r.fit_a != null
       for (let i = 0; i < r.code_data.length; i++) {
-        const t = (i * step).toFixed(6)
+        const t = (i * stepMs).toFixed(3)
         const code = r.code_data[i]
         const force = hasFit ? r.fit_a! * code + (r.fit_b ?? 0) : ''
-        csv += `${r.id},${new Date(r.timestamp).toISOString()},${i},${t},${code},${hasFit ? force : ''}\n`
+        csv += `${i},${t},${code},${hasFit ? force : ''}\n`
       }
     }
     return new Response(csv, {