refactor: split backend by context instead of type 'controllers/models/...'

app/user/middlewares/update_user_last_seen_middleware.ts

@@ -0,0 +1,16 @@
+import type { HttpContext } from '@adonisjs/core/http';
+import type { NextFn } from '@adonisjs/core/types/http';
+import { DateTime } from 'luxon';
+
+export default class UpdateUserLastSeenMiddleware {
+	async handle(ctx: HttpContext, next: NextFn) {
+		const user = ctx.auth.user;
+		if (user) {
+			user.lastSeenAt = DateTime.local();
+			await user.save();
+		}
+
+		const output = await next();
+		return output;
+	}
+}