fix: 更新数据面板的驱动方式

server/stats.js

@@ -0,0 +1,13 @@
+const db = require('./db')
+
+function getStats() {
+  const viewers = db.prepare(
+    "SELECT COUNT(*) as n FROM visits WHERE last_seen > datetime('now', '-2 minutes')"
+  ).get().n
+  const cumulative = db.prepare('SELECT total FROM visitor_count WHERE id = 1').get()?.total ?? 0
+  const feedbackCount = db.prepare('SELECT COUNT(*) as n FROM feedback').get().n ?? 0
+  const shareCount = db.prepare('SELECT total FROM share_count WHERE id = 1').get()?.total ?? 0
+  return { viewers, cumulative, feedbackCount, shareCount }
+}
+
+module.exports = { getStats }