Post --> Note

Closes #1411

src/models/note-watching.ts

@@ -0,0 +1,13 @@
+import * as mongo from 'mongodb';
+import db from '../db/mongodb';
+
+const NoteWatching = db.get<INoteWatching>('noteWatching');
+NoteWatching.createIndex(['userId', 'noteId'], { unique: true });
+export default NoteWatching;
+
+export interface INoteWatching {
+	_id: mongo.ObjectID;
+	createdAt: Date;
+	userId: mongo.ObjectID;
+	noteId: mongo.ObjectID;
+}