Fix MySQL query.

lib/queries.js

@@ -369,14 +369,34 @@ export function getRankings(website_id, start_at, end_at, type, table) {
 }
 
 export function getActiveVisitors(website_id) {
-  return prisma.$queryRaw(
-    `
+  const db = getDatabase();
+  const date = subMinutes(new Date(), 5);
+
+  if (db === POSTGRESQL) {
+    return prisma.$queryRaw(
+      `
     select count(distinct session_id) x
     from pageview
     where website_id=$1
     and created_at >= $2
     `,
-    website_id,
-    subMinutes(new Date(), 5),
-  );
+      website_id,
+      date,
+    );
+  }
+
+  if (db === MYSQL) {
+    return prisma.$queryRaw(
+      `
+    select count(distinct session_id) x
+    from pageview
+    where website_id=?
+    and created_at >= ?
+    `,
+      website_id,
+      date,
+    );
+  }
+
+  return Promise.resolve([]);
 }