fix: mark payment license as used after usage.

fix: fix system models with createdAt and updatedAt fields.
fix: reset password token expiration time.

server/src/system/migrations/20200422225247_create_user_invites_table.js

@@ -5,7 +5,7 @@ exports.up = function(knex) {
     table.string('email');
     table.string('token').unique();
     table.integer('tenant_id').unsigned();
-    table.timestamps();
+    table.datetime('created_at');
   });
 };