fix(db): update perf patch to use object

lib/db.js

@@ -502,7 +502,7 @@ module.exports = (
     }
 
     token.update(userAgentString)
-    const newToken = [{
+    const newToken = {
       tokenId: token.id,
       uid: uid,
       uaBrowser: token.uaBrowser,
@@ -512,7 +512,7 @@ module.exports = (
       uaDeviceType: token.uaDeviceType,
       lastAccessTime: token.lastAccessTime,
       createdAt: token.createdAt
-    }]
+    }
     let sessionTokens
     // get the object of session tokens associated with the given uid
     return this.redis.getAsync(uid)