feat: separate db models from server

packages/models/index.js

@@ -0,0 +1,22 @@
+import mongoose from 'mongoose'
+
+export { default as User } from './user.js'
+export { default as Quest } from './quest.js'
+export { default as Session } from './session.js'
+export { default as Command } from './command.js'
+
+export default async function connectDB(uri) {
+  try {
+    const db = await mongoose.connect(uri, {
+      useNewUrlParser: true,
+      useUnifiedTopology: true,
+    })
+    console.log('Connected to MongoDB')
+    console.log(mongoose.models)
+    return db.connection.getClient()
+  } catch (err) {
+    console.error(err)
+    process.exit(1)
+    return null
+  }
+}