feat: add usercount, session count and complete rate

packages/analytics/src/models/quests.js

@@ -0,0 +1,24 @@
+import { Session } from '@linux-odyssey/models'
+
+export function sessionCount() {
+  return Session.find().count()
+}
+
+export function sessionCompleted() {
+  return Session.find({ status: 'finished' }).count()
+}
+
+export function averageTimeUsage() {
+  return Session.aggregate([
+    {
+      $group: {
+        _id: '$quest',
+        average: {
+          $avg: {
+            $subtract: ['$finishedAt', '$createdAt'],
+          },
+        },
+      },
+    },
+  ])
+}

packages/analytics/src/models/users.js

@@ -0,0 +1,6 @@
+import { User } from '@linux-odyssey/models'
+
+// eslint-disable-next-line import/prefer-default-export
+export function userCount() {
+  return User.find().count()
+}