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app/javascript/controllers/readings_controller.js

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+import { post } from "@rails/request.js"
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static values = { url: String }
+
+  connect() {
+    post(this.urlValue, { responseKind: "turbo-stream" })
+  }
+}