Refactor: Rename userkey --> access-token

src/api/models/access-token.ts

@@ -0,0 +1,6 @@
+const collection = global.db.collection('access_tokens');
+
+collection.createIndex('token');
+collection.createIndex('hash');
+
+export default collection;

src/api/models/userkey.ts

@@ -1,5 +0,0 @@
-const collection = global.db.collection('userkeys');
-
-collection.createIndex('key');
-
-export default collection;