Fix autofocus on dynamically inserted forms, remove this.blur() handlers

form_controller.connect() now blurs the previously focused element and
explicitly focuses the [autofocus] element when a form is inserted into
the DOM (via Turbo Stream). Only runs when an [autofocus] element is
present, so closing forms and other stream updates are unaffected.

Remove all onclick='this.blur()' inline handlers from templates — they
were a workaround for the same autofocus problem, now solved properly
via the Stimulus lifecycle.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,122 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Fixin.me is a "quantified self" Rails 7.2.3 application for personal data tracking. Users define hierarchical **quantities** (metrics to track), **units** (with optional conversion hierarchies), and **readouts** (individual measurements). There is also a non-persistent **measurement** model used as a form wrapper.
+
+## Setup
+
+Configuration files are distributed as `.dist` templates — copy and customize before use:
+
+```bash
+cp config/application.rb.dist config/application.rb
+cp config/database.yml.dist config/database.yml
+cp config/puma.rb.dist config/puma.rb
+```
+
+```bash
+bundle config --local frozen true
+bundle config --local path .gem
+bundle config --local with mysql development test   # or: pg, sqlite
+bundle install
+RAILS_ENV=development bundle exec rails db:create db:migrate db:seed
+```
+
+## Common Commands
+
+```bash
+bundle exec rails s                                          # start server
+bundle exec rails test                                       # all unit/model/controller tests
+bundle exec rails test:system                                # all system tests (Capybara + Selenium)
+bundle exec rails test test/system/units_test.rb            # single test file
+bundle exec rails test --seed 64690 --name test_add_unit    # single test by name
+bundle exec rails db:seed:export                             # export default settings as seed file
+```
+
+## Architecture
+
+### Data Model
+
+- **Quantity** — hierarchical tree (self-referential `parent_id`). Cached `depth` and `pathname` fields are recomputed via recursive CTEs on write. Direct assignment to cached fields is blocked.
+- **Unit** — optional hierarchy via `base_id` and `multiplier` for unit conversion. Multiplier precision/scale is validated by a custom validator.
+- **Readout** — single measurement: `value` (IEEE 754 float), `quantity`, `unit`, `category`.
+- **Measurement** — `ActiveModel::Model` form wrapper (not database-backed); bridges the readout creation form.
+- **User** — Devise-managed with a status enum: `admin`, `active`, `restricted`, `locked`, `disabled`. Admins can disguise as other users.
+
+### Hierarchical Queries
+
+Both `Quantity` and `Unit` use recursive CTEs for tree traversal (ordered traversal, ancestors, progenies, common ancestors). `lib/core_ext/arel/` patches Arel to support CTE with `UPDATE`/`DELETE` statements, working around Rails issue #54658.
+
+### Custom Extensions (`lib/core_ext/`)
+
+- **arel/** — CTE support for UPDATE/DELETE
+- **active_model/** — precision/scale validator used by `Unit#multiplier`
+- **active_record/** — `attr_cached` mechanism (see `ApplicationRecord`)
+- **action_view/** — record identifier suffixes
+- Miscellaneous: `Array#delete_bang`, `BigDecimal` scientific notation
+
+### Response Handling
+
+Controllers respond to both HTML and Turbo Stream formats. Errors during Turbo Stream requests trigger a redirect with flash rather than rendering inline, handled in `ApplicationController`.
+
+### Numeric Precision
+
+Readout values are stored as IEEE 754 double-precision floats (not fixed-point decimals). Rationale in `DESIGN.md`: biological values span many orders of magnitude; 15-digit float precision is sufficient and avoids conversion overhead.
+
+### Routes
+
+```
+measurements   GET/POST /measurements
+readouts       GET/POST /readouts, DELETE /readouts/:id/discard
+quantities     CRUD + POST /quantities/:id/reparent
+units          CRUD + POST /units/:id/rebase
+users          CRUD + POST /users/:id/disguise, POST /users/revert
+default/       namespace for default units import/export and admin panel
+root           → /units (authenticated), /sign_in (unauthenticated)
+```
+
+## JavaScript Conventions
+
+### Use Stimulus for all JS behavior
+
+This app uses **Hotwire = Turbo + Stimulus**. All JavaScript behavior must be in Stimulus controllers under `app/javascript/controllers/`. Never use:
+- Inline HTML event handlers: `onclick="..."`, `onkeydown="..."`, `ondragstart="..."` etc.
+- Global `window.*` function exports
+- Bare `<script>` blocks in templates
+- `turbo:load` listeners for behavior that belongs in a controller's `connect()` lifecycle
+
+**Instead:**
+- Put behavior in a Stimulus controller method
+- Wire it with `data-action="event->controller#method"` in the template
+- Use `data-controller="name"` on the root element, `data-[name]-target="targetName"` for targets, `data-[name]-[valueName]-value="..."` for values
+- Use `connect()` / `disconnect()` for setup/teardown (MutationObservers, event listeners, etc.)
+
+Controller filename `foo_bar_controller.js` → identifier `foo-bar` → `data-controller="foo-bar"`.
+
+### No manual fetch() — use Turbo
+
+Never make AJAX requests with `fetch()` in JavaScript. Use Turbo's built-in mechanisms instead:
+
+- **Links/buttons that trigger server actions**: use `data: {turbo_stream: true}` on the element (link or button_to form).
+- **Dynamic form submissions from JS** (where HTML alone isn't enough): create a form element, append hidden inputs, and call `form.requestSubmit()`. Turbo intercepts it automatically — no manual CSRF handling, no `Turbo.renderStreamMessage()`.
+  ```javascript
+  var form = document.createElement('form');
+  form.action = url; form.method = 'post'; form.dataset.turboStream = 'true';
+  // append hidden inputs...
+  form.addEventListener('turbo:submit-end', function() { form.remove(); });
+  document.body.appendChild(form);
+  form.requestSubmit();
+  ```
+- **Server-rendered HTML**: use ERB partials and Turbo Stream views (`*.turbo_stream.erb`), never build HTML in JavaScript.
+
+### No HTML generation in JavaScript
+
+Never use JavaScript to build and insert HTML (no `innerHTML =`, no `createElement` trees for content). Render HTML server-side in ERB partials; update the DOM via Turbo Stream actions (`replace`, `update`, `append`, etc.).
+
+## Database Requirements
+
+The database must support:
+- Recursive CTEs with `UPDATE`/`DELETE` (MySQL ≥ 8.0, PostgreSQL, or SQLite3)
+- Decimal precision of 30+ digits

Gemfile

@@ -25,6 +25,7 @@ gem "devise"
 
 gem "importmap-rails"
 gem "turbo-rails", "~> 2.0"
+gem "stimulus-rails"
 
 group :development, :test do
   gem "byebug"

Gemfile.lock

@@ -273,6 +273,8 @@ GEM
     sqlite3 (2.9.0-x86_64-darwin)
     sqlite3 (2.9.0-x86_64-linux-gnu)
     sqlite3 (2.9.0-x86_64-linux-musl)
+    stimulus-rails (1.3.4)
+      railties (>= 6.0.0)
     stringio (3.2.0)
     thor (1.5.0)
     tilt (2.7.0)
@@ -324,6 +326,7 @@ DEPENDENCIES
   selenium-webdriver
   sprockets-rails
   sqlite3 (~> 2.7)
+  stimulus-rails
   turbo-rails (~> 2.0)
   tzinfo-data
   web-console

app/assets/images/pictograms/view-columns.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M4,4H8V20H4V4M10,4H14V20H10V4M16,4H21V20H16V4Z"/></svg>

app/assets/images/pictograms/view-rows.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M3,5H21V7H3V5M3,11H21V13H3V11M3,17H21V19H3V17Z"/></svg>

app/assets/stylesheets/application.css

@@ -36,6 +36,7 @@
   --color-blue: #009ade;
   --color-dark-red: #b21237;
   --color-red: #ff1f5b;
+  --color-purple: #8b2be2;
 
   --depth: 0;
 
@@ -110,6 +111,11 @@ svg {
 svg:last-child {
   margin-right: 0;
 }
+.chart-panel svg {
+  height: auto;
+  margin: 0;
+  width: auto;
+}
 textarea {
   margin: 0;
 }
@@ -231,6 +237,10 @@ textarea:invalid {
   text-decoration: underline 1px var(--color-border-gray);
   text-underline-offset: 0.25em;
 }
+button.link {
+  border: none;
+  padding: 0;
+}
 [name=cancel],
 .auxiliary {
   border-color: var(--color-border-gray);
@@ -252,6 +262,13 @@ textarea:invalid {
   background-color: var(--color-red);
   border-color: var(--color-red);
 }
+tr:has(select[data-changed]) button[name="button"],
+.set-default-unit:not([disabled]) {
+  background-color: var(--color-purple);
+  border-color: var(--color-purple);
+  color: white;
+  fill: white;
+}
 .link:focus-visible {
   text-decoration-color: var(--color-gray);
 }
@@ -361,7 +378,7 @@ header {
   pointer-events: auto;
 }
 .flash:before {
-  filter: invert();
+  filter: invert(100%);
   height: 1.4em;
   margin: 0 0.5em;
   width: 1.4em;
@@ -513,7 +530,7 @@ header {
   cursor: grab;
 }
 .items-table .form td {
-  vertical-align: top;
+  vertical-align: middle;
 }
 .items-table td:not(:first-child),
 .grayed {
@@ -640,3 +657,45 @@ li::marker {
   min-width: 66%;
   width: max-content;
 }
+.measurements-section {
+  overflow-x: auto;
+}
+body[data-measurements-view=wide] .measurements-compact,
+body[data-measurements-view=compact] .measurements-wide {
+  display: none;
+}
+body[data-measurements-view=compact] .view-toggle[data-view=compact],
+body[data-measurements-view=wide] .view-toggle[data-view=wide] {
+  background-color: var(--color-blue);
+  border-color: var(--color-blue);
+  color: white;
+  fill: white;
+}
+.chart-panel {
+  width: 100%;
+}
+#measurements tr.grouped td {
+  border-top: none;
+}
+#measurements tr.grouped .taken-at,
+#measurements tr.grouped .created-at {
+  visibility: hidden;
+}
+.measurements-wide td {
+  vertical-align: middle;
+  white-space: nowrap;
+}
+.wide-cell {
+  align-items: center;
+  display: inline-flex;
+  gap: 0.25em;
+}
+.wide-cell .button {
+  border: none;
+  font-size: inherit;
+  height: auto;
+  padding: 0;
+}
+.wide-cell button.link::after {
+  content: none;
+}

app/controllers/charts_controller.rb

@@ -0,0 +1,12 @@
+class ChartsController < ApplicationController
+  def index
+    readouts = current_user.readouts.includes(:quantity, :unit).order(:taken_at, :id)
+    @readouts_json = readouts.map { |r|
+      { takenAt: r.taken_at&.iso8601,
+        quantityId: r.quantity_id,
+        quantityName: r.quantity.name,
+        value: r.value.to_f,
+        unit: r.unit.symbol }
+    }.to_json
+  end
+end

app/controllers/measurements_controller.rb

@@ -1,7 +1,12 @@
 class MeasurementsController < ApplicationController
+  before_action :find_readout, only: [:destroy, :edit, :update]
+
+  before_action except: :index do
+    raise AccessForbidden unless current_user.at_least(:active)
+  end
+
   def index
-    @measurements = []
-    #@measurements = current_user.units.ordered.includes(:base, :subunits)
+    load_measurements
   end
 
   def new
@@ -9,8 +14,49 @@ class MeasurementsController < ApplicationController
   end
 
   def create
+    taken_at = params.permit(:taken_at)[:taken_at]
+    readout_params = params.permit(readouts: Readout::ATTRIBUTES).fetch(:readouts, [])
+    @readouts = readout_params.map { |rp| current_user.readouts.build(rp.merge(taken_at: taken_at)) }
+
+    if @readouts.present? && @readouts.all?(&:valid?)
+      ActiveRecord::Base.transaction { @readouts.each(&:save!) }
+      load_measurements
+      flash.now[:notice] = t('.success', count: @readouts.size)
+    else
+      errors = @readouts.flat_map { |r| r.errors.full_messages }
+      flash.now[:alert] = errors.present? ? errors.first : t('.no_readouts')
+    end
+  end
+
+  def edit
+    @user_units = current_user.units.ordered
+  end
+
+  def update
+    if @readout.update(params.require(:readout).permit(:value, :unit_id, :taken_at))
+      load_measurements
+      flash.now[:notice] = t('.success')
+    else
+      @user_units = current_user.units.ordered
+      render :edit
+    end
   end
 
   def destroy
+    @readout.destroy!
+    load_measurements
+    flash.now[:notice] = t('.success')
+  end
+
+  private
+
+  def find_readout
+    @readout = current_user.readouts.find(params[:id])
+  end
+
+  def load_measurements
+    @measurements = current_user.readouts.includes(:quantity, :unit).order(taken_at: :desc, id: :desc)
+    @wide_groups = @measurements.group_by(&:taken_at)
+    @wide_quantities = @measurements.map(&:quantity).uniq.sort_by(&:name)
   end
 end

app/controllers/quantities_controller.rb

@@ -8,6 +8,10 @@ class QuantitiesController < ApplicationController
     raise AccessForbidden unless current_user.at_least(:active)
   end
 
+  before_action only: [:new, :edit, :create, :update] do
+    @user_units = current_user.units.ordered
+  end
+
   def index
     @quantities = current_user.quantities.ordered.includes(:parent, :subquantities)
   end

app/helpers/application_helper.rb

@@ -86,6 +86,7 @@ module ApplicationHelper
     def initialize(...)
       super(...)
       @default_options.merge!(@options.slice(:form))
+      @default_html_options.merge!(@options.slice(:form))
     end
 
     [:text_field, :password_field, :text_area].each do |selector|
@@ -170,6 +171,7 @@ module ApplicationHelper
       ['measurements', 'scale-bathroom', :restricted],
       ['quantities', 'axis-arrow', :restricted, 'right'],
       ['units', 'weight-gram', :restricted],
+      ['charts', 'chart-line', :restricted],
       # TODO: display users tab only if >1 user present; sole_user?/sole_admin?
       ['users', 'account-multiple-outline', :admin],
     ]

app/javascript/application.js

@@ -1,54 +1,15 @@
 // Configure your import map in config/importmap.rb. Read more:
 // https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
+import "controllers"
 
 
 /* Hide page before loaded for testing purposes */
-function showPage(event) {
-  document.documentElement.style.visibility="visible"
+function showPage() {
+  document.documentElement.style.visibility = "visible"
 }
 document.addEventListener('turbo:load', showPage)
 
-function detailsChange(event) {
-  var target = event.currentTarget
-  var count = target.querySelectorAll('input:checked:not([disabled])').length
-  var span = target.querySelector('summary > span')
-  var button = target.querySelector('button')
-  if (count > 0) {
-    span.textContent = count + ' selected';
-    Turbo.StreamElement.prototype.enableElement(button)
-  } else {
-    span.textContent = span.getAttribute('data-prompt')
-    Turbo.StreamElement.prototype.disableElement(button)
-  }
-}
-window.detailsChange = detailsChange
-
-/* Close open <details> when focus lost */
-function detailsClose(event) {
-  if (!event.relatedTarget ||
-      event.relatedTarget.closest("details") != event.currentTarget) {
-    event.currentTarget.removeAttribute("open")
-  }
-}
-window.detailsClose = detailsClose
-
-window.detailsObserver = new MutationObserver((mutations) => {
-  mutations[0].target.dispatchEvent(new Event('change', {bubbles: true}))
-});
-
-function formValidate(event) {
-  var id = event.submitter.getAttribute("data-validate")
-  if (!id) return;
-
-  var input = document.getElementById(id)
-  if (!input.checkValidity()) {
-    input.reportValidity()
-    event.preventDefault()
-  }
-}
-window.formValidate = formValidate
-
 
 /* Turbo stream actions */
 Turbo.StreamElement.prototype.disableElement = function(element) {
@@ -111,117 +72,3 @@ Turbo.StreamActions.unselect = function() {
     this.enableElement(e)
   })
 }
-
-function formProcessKey(event) {
-  switch (event.key) {
-    case "Escape":
-      event.currentTarget.querySelector("a[name=cancel]").click()
-      break
-    case "Enter":
-      event.currentTarget.querySelector("button[name=button]").click()
-      event.preventDefault()
-      break
-  }
-}
-window.formProcessKey = formProcessKey
-
-function detailsProcessKey(event) {
-  // TODO: up/down arrows to move focus to prev/next line
-  switch (event.key) {
-    case "Escape":
-      if (event.currentTarget.hasAttribute("open")) {
-        event.currentTarget.removeAttribute("open")
-        event.stopPropagation()
-      }
-      break
-    case "Enter":
-      var button = event.currentTarget.querySelector("button:not([disabled])")
-      if (button) {
-        button.click()
-        // Autofocus won't be respected unless target is blurred
-        event.target.blur()
-        event.preventDefault()
-        event.stopPropagation()
-      }
-      break
-  }
-}
-window.detailsProcessKey = detailsProcessKey;
-
-/* Items table drag and drop support */
-var lastEnterTime
-function dragStart(event) {
-  lastEnterTime = event.timeStamp
-  var row = event.currentTarget
-  row.closest("table").querySelectorAll("thead tr").forEach((tr) => {
-    tr.toggleAttribute("hidden")
-  })
-  event.dataTransfer.setData("text/plain", row.getAttribute("data-drag-path"))
-  var rowRectangle = row.getBoundingClientRect()
-  event.dataTransfer.setDragImage(row, event.x - rowRectangle.left, event.y - rowRectangle.top)
-  event.dataTransfer.dropEffect = "move"
-}
-window.dragStart = dragStart
-
-/*
-* Drag tracking assumptions (based on FF 122.0 experience):
-*   * Enter/Leave events at the same timeStamp may not be logically ordered
-*     (e.g. E -> E -> L, not E -> L -> E),
-*   * not every Enter event has corresponding Leave event, especially during
-*     rapid pointer moves
-* NOTE: sometimes Leave is not emitted when pointer goes fast over table
-* and outside. This should probably be fixed in browser, than patched here.
-*/
-function dragEnter(event) {
-  //console.log(event.timeStamp + " " + event.type + ": " + event.currentTarget.id)
-  dragLeave(event)
-  lastEnterTime = event.timeStamp
-  const id = event.currentTarget.getAttribute("data-drop-id")
-  document.getElementById(id).classList.add("dropzone")
-}
-window.dragEnter = dragEnter
-
-function dragOver(event) {
-  event.preventDefault()
-}
-window.dragOver = dragOver
-
-function dragLeave(event) {
-  //console.log(event.timeStamp + " " + event.type + ": " + event.currentTarget.id)
-  // Leave has been accounted for by Enter at the same timestamp, processed earlier
-  if (event.timeStamp <= lastEnterTime) return
-  event.currentTarget.closest("table").querySelectorAll(".dropzone").forEach((tr) => {
-    tr.classList.remove("dropzone")
-  })
-}
-window.dragLeave = dragLeave
-
-function dragEnd(event) {
-  dragLeave(event)
-  event.currentTarget.closest("table").querySelectorAll("thead tr").forEach((tr) => {
-    tr.toggleAttribute("hidden")
-  })
-}
-window.dragEnd = dragEnd
-
-function drop(event) {
-  event.preventDefault()
-
-  var params = new URLSearchParams()
-  var id_param = event.currentTarget.getAttribute("data-drop-id-param")
-  var id = event.currentTarget.getAttribute("data-drop-id").split("_").pop()
-  params.append(id_param, id)
-
-  fetch(event.dataTransfer.getData("text/plain"), {
-    body: params,
-    headers: {
-      "Accept": "text/vnd.turbo-stream.html",
-      "X-CSRF-Token": document.head.querySelector("meta[name=csrf-token]").content,
-      "X-Requested-With": "XMLHttpRequest"
-    },
-    method: "POST"
-  })
-  .then(response => response.text())
-  .then(html => Turbo.renderStreamMessage(html))
-}
-window.drop = drop

app/javascript/controllers/application.js

@@ -0,0 +1,7 @@
+import { Application } from "@hotwired/stimulus"
+
+const application = Application.start()
+application.debug = false
+window.Stimulus = application
+
+export { application }

app/javascript/controllers/charts_controller.js

@@ -0,0 +1,45 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["container", "data"]
+
+  connect() {
+    const readouts = JSON.parse(this.dataTarget.textContent)
+    if (readouts.length === 0) return
+
+    const quantities = new Map()
+    readouts.forEach(r => {
+      if (!r.takenAt) return
+      if (!quantities.has(r.quantityId)) {
+        quantities.set(r.quantityId, { name: r.quantityName, unit: r.unit, x: [], y: [] })
+      }
+      const q = quantities.get(r.quantityId)
+      q.x.push(r.takenAt)
+      q.y.push(r.value)
+    })
+
+    const traces = []
+    quantities.forEach(q => {
+      traces.push({
+        x: q.x, y: q.y,
+        mode: 'lines+markers', type: 'scatter',
+        name: q.name + ' (' + q.unit + ')',
+        marker: { size: 5 }
+      })
+    })
+
+    const div = document.createElement('div')
+    div.className = 'chart-panel'
+    this.containerTarget.appendChild(div)
+
+    Plotly.newPlot(div, traces, {
+      xaxis: { type: 'date', tickformat: '%Y-%m-%d %H:%M' },
+      yaxis: {},
+      margin: { t: 20, r: 20, b: 80, l: 60 },
+      paper_bgcolor: 'transparent',
+      plot_bgcolor: 'transparent',
+      font: { family: 'system-ui' },
+      legend: { orientation: 'h', y: -0.25 }
+    }, { responsive: true, displayModeBar: false })
+  }
+}

app/javascript/controllers/details_controller.js

@@ -0,0 +1,55 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["countLabel", "submitButton", "list"]
+
+  connect() {
+    this._observer = new MutationObserver(() => {
+      this.element.dispatchEvent(new Event('change', { bubbles: true }))
+    })
+    this._observer.observe(this.listTarget, { subtree: true, attributeFilter: ['disabled'] })
+  }
+
+  disconnect() {
+    this._observer?.disconnect()
+  }
+
+  change() {
+    const count = this.element.querySelectorAll('input:checked:not([disabled])').length
+    if (count > 0) {
+      this.countLabelTarget.textContent = count + ' selected'
+      Turbo.StreamElement.prototype.enableElement(this.submitButtonTarget)
+    } else {
+      this.countLabelTarget.textContent = this.countLabelTarget.dataset.prompt
+      Turbo.StreamElement.prototype.disableElement(this.submitButtonTarget)
+    }
+  }
+
+  close(event) {
+    if (!event.relatedTarget ||
+        event.relatedTarget.closest("details") != this.element) {
+      this.element.removeAttribute("open")
+    }
+  }
+
+  processKey(event) {
+    switch (event.key) {
+      case "Escape":
+        if (this.element.hasAttribute("open")) {
+          this.element.removeAttribute("open")
+          event.stopPropagation()
+        }
+        break
+      case "Enter": {
+        const button = this.element.querySelector("button:not([disabled])")
+        if (button) {
+          button.click()
+          event.target.blur()
+          event.preventDefault()
+          event.stopPropagation()
+        }
+        break
+      }
+    }
+  }
+}

app/javascript/controllers/drag_controller.js

@@ -0,0 +1,62 @@
+import { Controller } from "@hotwired/stimulus"
+
+// Shared across all instances — drag spans multiple elements
+let lastEnterTime
+
+export default class extends Controller {
+  static values = {
+    dragPath: String,
+    dropId: String,
+    dropIdParam: String
+  }
+
+  start(event) {
+    lastEnterTime = event.timeStamp
+    this.element.closest("table").querySelectorAll("thead tr").forEach(tr => {
+      tr.toggleAttribute("hidden")
+    })
+    event.dataTransfer.setData("text/plain", this.dragPathValue)
+    const rect = this.element.getBoundingClientRect()
+    event.dataTransfer.setDragImage(this.element, event.x - rect.left, event.y - rect.top)
+    event.dataTransfer.dropEffect = "move"
+  }
+
+  end(event) {
+    this.leave(event)
+    this.element.closest("table").querySelectorAll("thead tr").forEach(tr => {
+      tr.toggleAttribute("hidden")
+    })
+  }
+
+  enter(event) {
+    this.leave(event)
+    lastEnterTime = event.timeStamp
+    document.getElementById(this.dropIdValue)?.classList.add("dropzone")
+  }
+
+  over(event) {
+    event.preventDefault()
+  }
+
+  leave(event) {
+    if (event.timeStamp <= lastEnterTime) return
+    this.element.closest("table").querySelectorAll(".dropzone").forEach(tr => {
+      tr.classList.remove("dropzone")
+    })
+  }
+
+  drop(event) {
+    event.preventDefault()
+    const id = this.dropIdValue.split("_").pop()
+    const form = document.createElement('form')
+    form.action = event.dataTransfer.getData("text/plain")
+    form.method = 'post'
+    form.dataset.turboStream = 'true'
+    const input = document.createElement('input')
+    input.type = 'hidden'; input.name = this.dropIdParamValue; input.value = id
+    form.appendChild(input)
+    form.addEventListener('turbo:submit-end', () => form.remove())
+    document.body.appendChild(form)
+    form.requestSubmit()
+  }
+}

app/javascript/controllers/form_controller.js

@@ -0,0 +1,33 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  connect() {
+    const autofocusEl = this.element.querySelector('[autofocus]')
+    if (autofocusEl) {
+      document.activeElement?.blur()
+      autofocusEl.focus()
+    }
+  }
+
+  processKey(event) {
+    switch (event.key) {
+      case "Escape":
+        this.element.querySelector("a[name=cancel]").click()
+        break
+      case "Enter":
+        this.element.querySelector("button[name=button]").click()
+        event.preventDefault()
+        break
+    }
+  }
+
+  validate(event) {
+    const id = event.submitter?.getAttribute("data-validate")
+    if (!id) return
+    const input = document.getElementById(id)
+    if (!input.checkValidity()) {
+      input.reportValidity()
+      event.preventDefault()
+    }
+  }
+}

app/javascript/controllers/index.js

@@ -0,0 +1,3 @@
+import { application } from "controllers/application"
+import { eagerLoadControllersFrom } from "@hotwired/stimulus-loading"
+eagerLoadControllersFrom("controllers", application)

app/javascript/controllers/measurements_controller.js

@@ -0,0 +1,29 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["tbody"]
+
+  connect() {
+    this.#group()
+    this._observer = new MutationObserver(() => this.#group())
+    this._observer.observe(this.tbodyTarget, {
+      childList: true, subtree: true,
+      attributes: true, attributeFilter: ['style']
+    })
+  }
+
+  disconnect() {
+    this._observer?.disconnect()
+  }
+
+  #group() {
+    let prevTakenAt = null
+    Array.from(this.tbodyTarget.querySelectorAll('tr[data-taken-at]'))
+      .filter(row => row.style.display !== 'none')
+      .forEach(row => {
+        const takenAt = row.dataset.takenAt
+        row.classList.toggle('grouped', takenAt !== null && takenAt === prevTakenAt)
+        prevTakenAt = takenAt
+      })
+  }
+}

app/javascript/controllers/measurements_view_controller.js

@@ -0,0 +1,17 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  connect() {
+    document.body.dataset.measurementsView = this.#get()
+  }
+
+  set(event) {
+    const view = event.params.name
+    localStorage.setItem('measurements-view', view)
+    document.body.dataset.measurementsView = view
+  }
+
+  #get() {
+    return localStorage.getItem('measurements-view') || 'compact'
+  }
+}

app/javascript/controllers/readout_unit_controller.js

@@ -0,0 +1,36 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = ["select", "button"]
+
+  unitChanged() {
+    if (this.selectTarget.value && this.selectTarget.value !== this.selectTarget.dataset.defaultUnitId) {
+      Turbo.StreamElement.prototype.enableElement(this.buttonTarget)
+    } else {
+      Turbo.StreamElement.prototype.disableElement(this.buttonTarget)
+    }
+  }
+
+  setDefault() {
+    const select = this.selectTarget
+    const form = document.createElement('form')
+    form.action = this.buttonTarget.dataset.path
+    form.method = 'post'
+    form.dataset.turboStream = 'true'
+    const methodInput = document.createElement('input')
+    methodInput.type = 'hidden'; methodInput.name = '_method'; methodInput.value = 'patch'
+    const unitInput = document.createElement('input')
+    unitInput.type = 'hidden'; unitInput.name = 'quantity[default_unit_id]'; unitInput.value = select.value
+    form.appendChild(methodInput)
+    form.appendChild(unitInput)
+    form.addEventListener('turbo:submit-end', event => {
+      if (event.detail.success) {
+        select.dataset.defaultUnitId = select.value
+        this.unitChanged()
+      }
+      form.remove()
+    })
+    document.body.appendChild(form)
+    form.requestSubmit()
+  }
+}

app/models/quantity.rb

@@ -1,9 +1,10 @@
 class Quantity < ApplicationRecord
-  ATTRIBUTES = [:name, :description, :parent_id]
+  ATTRIBUTES = [:name, :description, :parent_id, :default_unit_id]
   attr_cached :depth, :pathname
 
   belongs_to :user, optional: true
   belongs_to :parent, optional: true, class_name: "Quantity"
+  belongs_to :default_unit, optional: true, class_name: "Unit"
   has_many :subquantities, ->{ order(:name) }, class_name: "Quantity",
     inverse_of: :parent, dependent: :restrict_with_error
 

app/models/readout.rb

@@ -1,5 +1,5 @@
 class Readout < ApplicationRecord
-  ATTRIBUTES = [:quantity_id, :value, :unit_id]
+  ATTRIBUTES = [:quantity_id, :value, :unit_id, :taken_at]
 
   belongs_to :user
   belongs_to :quantity

app/views/charts/index.html.erb

@@ -0,0 +1,4 @@
+<div data-controller="charts">
+  <div class="main-area" id="measurements-charts" data-charts-target="container"></div>
+  <script id="charts-data" type="application/json" data-charts-target="data"><%= raw @readouts_json %></script>
+</div>

app/views/layouts/application.html.erb

@@ -14,6 +14,7 @@
     <%= csp_meta_tag %>
 
     <%= stylesheet_link_tag "spreadsheet" %>
+    <script src="https://cdn.plot.ly/plotly-basic-2.35.2.min.js"></script>
     <%= javascript_importmap_tags %>
 
     <%#= turbo_page_requires_reload_tag %>

app/views/measurements/_edit_form.html.erb

@@ -0,0 +1,25 @@
+<%= tabular_fields_for @readout, form: form_tag do |form| %>
+  <%- tag.tr id: row, class: "form",
+    data: {controller: 'form', action: 'keydown->form#processKey',
+           form: form_tag, hidden_row: hidden_row, link: link} do %>
+    <td><%= @readout.quantity %></td>
+    <td class="ralign">
+      <%= form.number_field :value, required: true, autofocus: true %>
+    </td>
+    <td>
+      <%= form.collection_select :unit_id, @user_units, :id,
+        ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
+        {}, required: true %>
+    </td>
+    <td>
+      <%= form.datetime_field :taken_at %>
+    </td>
+    <td></td>
+    <td class="flex">
+      <%= form.button %>
+      <%= image_link_to t(:cancel), "close-outline", measurements_path,
+        class: 'dangerous', name: :cancel,
+        onclick: render_turbo_stream('edit_form_close', {row: row}) %>
+    </td>
+  <% end %>
+<% end %>

app/views/measurements/_edit_form_close.html.erb

@@ -0,0 +1,2 @@
+<%= turbo_stream.close_form row %>
+<%= turbo_stream.update :flashes %>

app/views/measurements/_edit_panel.html.erb

@@ -0,0 +1,34 @@
+<% form_tag = dom_id(@readout, :edit, :form) %>
+<% row = dom_id(@readout, :edit) %>
+<% hidden_row = dom_id(@readout) %>
+
+<%= tabular_form_with model: @readout, url: measurement_path(@readout),
+  id: form_tag do |form| %>
+  <table class="items-table">
+    <tbody>
+      <%= tag.tr id: row, class: "form",
+        data: {controller: 'form', action: 'keydown->form#processKey',
+               form: form_tag, hidden_row: hidden_row} do %>
+        <td><%= @readout.quantity %></td>
+        <td class="ralign">
+          <%= form.number_field :value, required: true, autofocus: true %>
+        </td>
+        <td>
+          <%= form.collection_select :unit_id, @user_units, :id,
+            ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
+            {}, required: true %>
+        </td>
+        <td>
+          <%= form.datetime_field :taken_at %>
+        </td>
+        <td></td>
+        <td class="flex">
+          <%= form.button %>
+          <%= image_link_to t(:cancel), "close-outline", measurements_path,
+            class: 'dangerous', name: :cancel,
+            onclick: render_turbo_stream('edit_form_close', {row: row}) %>
+        </td>
+      <% end %>
+    </tbody>
+  </table>
+<% end %>

app/views/measurements/_form.html.erb

@@ -1,6 +1,6 @@
 <%= tabular_form_with model: Measurement.new, id: :measurement_form,
   class: 'topside-area flex vertical center',
-  html: {onkeydown: 'formProcessKey(event)'} do |form| %>
+  html: {data: {controller: 'form', action: 'keydown->form#processKey'}} do |form| %>
 
   <table class="items-table center">
     <tbody id="readouts">
@@ -8,7 +8,7 @@
         <tr class="italic">
           <td class="hexpand hmin50"><%= t '.taken_at_html' %></td>
           <td colspan="3" class="ralign">
-            <%= form.datetime_field :taken_at, required: true %>
+            <%= form.datetime_field :taken_at, required: true, value: Time.current.strftime('%Y-%m-%dT%H:%M') %>
           </td>
         </tr>
       <% end %>
@@ -17,17 +17,18 @@
 
   <%# TODO: right-click selection; unnecessary with hierarchical tags? %>
   <details id="quantity_select" class="center hexpand" open
-           onkeydown="detailsProcessKey(event)">
+           data-controller="details"
+           data-action="focusout->details#close change->details#change keydown->details#processKey">
     <summary autofocus>
       <!-- TODO: Set content with CSS when span empty to avoid duplication -->
-      <span data-prompt="<%= t('.select_quantity') %>">
+      <span data-prompt="<%= t('.select_quantity') %>" data-details-target="countLabel">
         <%= t('.select_quantity') %>
       </span>
       <%= image_button_tag t(:apply), "update", name: nil, disabled: true,
         formaction: new_readout_path, formmethod: :get, formnovalidate: true,
-        data: {turbo_stream: true} %>
+        data: {turbo_stream: true, details_target: 'submitButton'} %>
     </summary>
-    <ul><%= quantities_check_boxes(@quantities) %></ul>
+    <ul data-details-target="list"><%= quantities_check_boxes(@quantities) %></ul>
   </details>
 
   <div class="flex reverse">
@@ -36,10 +37,3 @@
       class: 'dangerous', onclick: render_turbo_stream('form_close') %>
   </div>
 <% end %>
-
-<script>
-  quantity_select.addEventListener('focusout', detailsClose)
-  quantity_select.addEventListener('change', detailsChange)
-  detailsObserver.observe(quantity_select.querySelector('ul'),
-    {subtree: true, attributeFilter: ['disabled']})
-</script>

app/views/measurements/_readout.html.erb

@@ -0,0 +1,22 @@
+<%= tag.tr id: dom_id(readout), data: {taken_at: readout.taken_at&.iso8601,
+  quantity_id: readout.quantity_id, quantity_name: readout.quantity.name,
+  value: format("%.10g", readout.value), unit: readout.unit.symbol} do %>
+  <td>
+    <% if current_user.at_least(:active) %>
+      <%= link_to readout.quantity, edit_measurement_path(readout),
+        class: 'link', data: {turbo_stream: true} %>
+    <% else %>
+      <%= readout.quantity %>
+    <% end %>
+  </td>
+  <td class="ralign"><%= format("%.10g", readout.value) %></td>
+  <td><%= readout.unit %></td>
+  <td class="taken-at"><%= l(readout.taken_at) if readout.taken_at %></td>
+  <td class="created-at"><%= l(readout.created_at) %></td>
+  <% if current_user.at_least(:active) %>
+    <td class="flex">
+      <%= image_button_to t('.destroy'), 'delete-outline', measurement_path(readout),
+        method: :delete, data: {turbo_stream: true} %>
+    </td>
+  <% end %>
+<% end %>

app/views/measurements/_wide_table.html.erb

@@ -0,0 +1,41 @@
+<table class="items-table">
+  <thead>
+    <tr>
+      <th><%= Readout.human_attribute_name(:taken_at) %></th>
+      <% wide_quantities.each do |q| %>
+        <th><%= q.name %></th>
+      <% end %>
+      <th><%= Readout.human_attribute_name(:created_at) %></th>
+    </tr>
+  </thead>
+  <tbody>
+    <% wide_groups.each do |taken_at, readouts| %>
+      <tr>
+        <td><%= l(taken_at) if taken_at %></td>
+        <% wide_quantities.each do |q| %>
+          <% readout = readouts.find { |r| r.quantity_id == q.id } %>
+          <td class="ralign">
+            <% if readout %>
+              <span class="wide-cell">
+                <% if current_user.at_least(:active) %>
+                  <%= link_to format("%.10g", readout.value),
+                    edit_measurement_path(readout, view: :wide),
+                    class: 'link',
+                    data: {turbo_stream: true} %>
+                <% else %>
+                  <%= format("%.10g", readout.value) %>
+                <% end %>
+                &nbsp;<%= readout.unit.symbol %>
+                <% if current_user.at_least(:active) %>
+                  <%= image_button_to '', 'delete-outline', measurement_path(readout),
+                    method: :delete, data: {turbo_stream: true} %>
+                <% end %>
+              </span>
+            <% end %>
+          </td>
+        <% end %>
+        <td><%= l(readouts.first.created_at) %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>

app/views/measurements/create.turbo_stream.erb

@@ -0,0 +1,13 @@
+<% if @readouts.present? && @readouts.all?(&:persisted?) %>
+  <%= turbo_stream.update :flashes %>
+  <%= turbo_stream.remove :measurement_form %>
+  <%= turbo_stream.enable :new_measurement_link %>
+  <%= turbo_stream.remove :no_items %>
+  <% @readouts.each do |readout| %>
+    <%= turbo_stream.prepend :measurements, partial: 'readout', locals: {readout: readout} %>
+  <% end %>
+  <%= turbo_stream.update 'measurements-wide', partial: 'wide_table',
+    locals: {wide_groups: @wide_groups, wide_quantities: @wide_quantities} %>
+<% else %>
+  <%= turbo_stream.update :flashes %>
+<% end %>

app/views/measurements/destroy.turbo_stream.erb

@@ -0,0 +1,5 @@
+<%= turbo_stream.update :flashes %>
+<%= turbo_stream.remove @readout %>
+<%= turbo_stream.append(:measurements, render_no_items) if current_user.readouts.empty? %>
+<%= turbo_stream.update 'measurements-wide', partial: 'wide_table',
+  locals: {wide_groups: @wide_groups, wide_quantities: @wide_quantities} %>

app/views/measurements/edit.turbo_stream.erb

@@ -0,0 +1,18 @@
+<% ids = {row: dom_id(@readout, :edit),
+          hidden_row: dom_id(@readout),
+          link: nil,
+          form_tag: dom_id(@readout, :edit, :form)} %>
+
+<% if params[:view] == 'wide' %>
+  <%= turbo_stream.update :measurement_edit_form, partial: 'edit_panel' %>
+  <%= turbo_stream.hide ids[:hidden_row] %>
+<% else %>
+  <%= turbo_stream.append :measurement_edit_form do %>
+    <%- tabular_form_with model: @readout, url: measurement_path(@readout),
+      html: {id: ids[:form_tag]} do %>
+    <% end %>
+  <% end %>
+  <%= turbo_stream.hide ids[:hidden_row] %>
+  <%= turbo_stream.remove ids[:row] %>
+  <%= turbo_stream.after @readout, partial: 'edit_form', locals: ids -%>
+<% end %>

app/views/measurements/index.html.erb

@@ -1,14 +1,41 @@
 <%# TODO: show hint when no quantities/units defined %>
-<div class="rightside-area buttongrid">
+<div class="rightside-area buttongrid" data-controller="measurements-view">
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.new_measurement'), 'plus-outline', new_measurement_path,
-      id: :new_measurement_link, onclick: 'this.blur();',
+      id: :new_measurement_link,
       data: {turbo_stream: true} %>
   <% end %>
+  <%= image_button_tag '', 'view-rows', name: nil, type: 'button',
+    class: 'view-toggle', title: t('.view_compact'),
+    data: {view: 'compact', action: 'click->measurements-view#set',
+           'measurements-view-name-param': 'compact'} %>
+  <%= image_button_tag '', 'view-columns', name: nil, type: 'button',
+    class: 'view-toggle', title: t('.view_wide'),
+    data: {view: 'wide', action: 'click->measurements-view#set',
+           'measurements-view-name-param': 'wide'} %>
 </div>
 
-<table class="main-area">
-  <tbody id="measurements">
-    <%= render(@measurements) || render_no_items %>
-  </tbody>
-</table>
+<div class="main-area measurements-section">
+  <%= tag.div id: :measurement_edit_form %>
+  <table class="items-table measurements-compact" data-controller="measurements">
+    <thead>
+      <tr>
+        <th><%= Quantity.model_name.human %></th>
+        <th><%= Readout.human_attribute_name(:value) %></th>
+        <th><%= Unit.model_name.human %></th>
+        <th data-column="taken-at"><%= Readout.human_attribute_name(:taken_at) %></th>
+        <th data-column="created-at"><%= Readout.human_attribute_name(:created_at) %></th>
+        <% if current_user.at_least(:active) %>
+          <th></th>
+        <% end %>
+      </tr>
+    </thead>
+    <tbody id="measurements" data-measurements-target="tbody">
+      <%= render(partial: 'readout', collection: @measurements, as: :readout) || render_no_items %>
+    </tbody>
+  </table>
+
+  <div id="measurements-wide" class="measurements-wide">
+    <%= render 'wide_table', wide_groups: @wide_groups, wide_quantities: @wide_quantities %>
+  </div>
+</div>

app/views/measurements/update.turbo_stream.erb

@@ -0,0 +1,4 @@
+<%= turbo_stream.close_form dom_id(@readout, :edit) %>
+<%= turbo_stream.replace @readout, partial: 'measurements/readout', locals: {readout: @readout} %>
+<%= turbo_stream.update 'measurements-wide', partial: 'wide_table',
+  locals: {wide_groups: @wide_groups, wide_quantities: @wide_quantities} %>

app/views/quantities/_form.html.erb

@@ -1,6 +1,7 @@
 <%= tabular_fields_for @quantity, form: form_tag do |form| %>
-  <%- tag.tr id: row, class: "form", onkeydown: "formProcessKey(event)",
-    data: {link: link, form: form_tag, hidden_row: hidden_row} do %>
+  <%- tag.tr id: row, class: "form",
+    data: {controller: 'form', action: 'keydown->form#processKey',
+           link: link, form: form_tag, hidden_row: hidden_row} do %>
 
     <td style="--depth:<%= @quantity.depth %>">
       <%= form.text_field :name, required: true, autofocus: true, size: 20 %>
@@ -8,6 +9,11 @@
     <td>
       <%= form.text_area :description, cols: 30, rows: 1, escape: false %>
     </td>
+    <td>
+      <%= form.collection_select :default_unit_id, @user_units, :id,
+        ->(u){ sanitize('&emsp;' * (u.base_id? ? 1 : 0) + u.symbol) },
+        {include_blank: true}, onchange: "this.dataset.changed = ''" %>
+    </td>
 
     <td class="flex">
       <%= form.button %>

app/views/quantities/_quantity.html.erb

@@ -1,20 +1,22 @@
 <%= tag.tr id: dom_id(quantity),
-           ondragstart: "dragStart(event)", ondragend: "dragEnd(event)",
-           ondragover: "dragOver(event)", ondrop: "drop(event)",
-           ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
-           data: {drag_path: reparent_quantity_path(quantity), drop_id: dom_id(quantity),
-                  drop_id_param: "quantity[parent_id]"} do %>
+           draggable: true,
+           data: {controller: 'drag',
+                  action: 'dragstart->drag#start dragend->drag#end dragover->drag#over drop->drag#drop dragenter->drag#enter dragleave->drag#leave',
+                  drag_drag_path_value: reparent_quantity_path(quantity),
+                  drag_drop_id_value: dom_id(quantity),
+                  drag_drop_id_param_value: 'quantity[parent_id]'} do %>
 
   <td style="--depth:<%= quantity.depth %>">
     <%= link_to quantity, edit_quantity_path(quantity), class: 'link',
-      onclick: 'this.blur();', data: {turbo_stream: true} %>
+      data: {turbo_stream: true} %>
   </td>
   <td><%= quantity.description %></td>
+  <td><%= quantity.default_unit&.symbol %></td>
 
   <% if current_user.at_least(:active) %>
     <td class="flex">
       <%= image_link_to t('.new_subquantity'), 'plus-outline', new_quantity_path(quantity),
-        id: dom_id(quantity, :new, :link), onclick: 'this.blur();', data: {turbo_stream: true} %>
+        id: dom_id(quantity, :new, :link), data: {turbo_stream: true} %>
 
       <%= image_button_to_if quantity.destroyable?, t('.destroy'), 'delete-outline',
         quantity_path(quantity), method: :delete %>

app/views/quantities/index.html.erb

@@ -1,7 +1,7 @@
 <div class="rightside-area buttongrid">
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.new_quantity'), 'plus-outline', new_quantity_path,
-      id: dom_id(Quantity, :new, :link), onclick: 'this.blur();',
+      id: dom_id(Quantity, :new, :link),
       data: {turbo_stream: true} %>
   <% end %>
   <%#= image_link_to t('.import_quantities'), 'download-outline', default_quantities_path,
@@ -16,16 +16,18 @@
     <tr>
       <th><%= Quantity.human_attribute_name(:name) %></th>
       <th class="hexpand"><%= Quantity.human_attribute_name(:description) %></th>
+      <th><%= Quantity.human_attribute_name(:default_unit) %></th>
       <% if current_user.at_least(:active) %>
         <th><%= t :actions %></th>
         <th></th>
       <% end %>
     </tr>
     <%= tag.tr id: "quantity_", hidden: true,
-               ondragover: "dragOver(event)", ondrop: "drop(event)",
-               ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
-               data: {drop_id: "quantity_", drop_id_param: "quantity[parent_id]"} do %>
-      <th colspan="4"><%= t '.top_level_drop' %></th>
+               data: {controller: 'drag',
+                      action: 'dragover->drag#over drop->drag#drop dragenter->drag#enter dragleave->drag#leave',
+                      drag_drop_id_value: 'quantity_',
+                      drag_drop_id_param_value: 'quantity[parent_id]'} do %>
+      <th colspan="5"><%= t '.top_level_drop' %></th>
     <% end %>
   </thead>
   <tbody id="quantities">

app/views/readouts/_form.html.erb

@@ -1,6 +1,6 @@
-<%# TODO: add readout reordering by dragging %>
 <%= tabular_fields_for 'readouts[]', readout do |form| %>
-  <%- tag.tr id: dom_id(readout.quantity, :new, :readout) do %>
+  <%- tag.tr id: dom_id(readout.quantity, :new, :readout),
+             data: {controller: 'readout-unit'} do %>
     <td>
       <%# TODO: add grayed readout index (in separate column?) %>
       <%= readout.quantity.relative_pathname(@superquantity) %>
@@ -12,10 +12,19 @@
     <td>
       <%= form.collection_select :unit_id, @user_units, :id,
         ->(u){ sanitize('&emsp;' * (u.base_id ? 1 : 0) + u.symbol) },
-        {prompt: '', disabled: '', selected: ''}, required: true %>
+        {prompt: '', disabled: '', selected: readout.quantity.default_unit_id || ''}, required: true,
+        data: {default_unit_id: readout.quantity.default_unit_id || '',
+               readout_unit_target: 'select',
+               action: 'change->readout-unit#unitChanged'} %>
     </td>
     <td class="flex">
       <%# TODO: change to _link_ after giving up displaying relative paths %>
+      <%= image_button_tag '', 'check-circle-outline',
+        class: 'set-default-unit', name: nil, type: 'button', disabled: true,
+        title: t('readouts.form.set_default_unit'),
+        data: {path: quantity_path(readout.quantity),
+               readout_unit_target: 'button',
+               action: 'click->readout-unit#setDefault'} %>
       <%= image_button_tag '', 'delete-outline', class: 'dangerous', name: nil,
         formaction: discard_readouts_path(readout.quantity),
         formmethod: :get, formnovalidate: true, data: {turbo_stream: true} %>

app/views/units/_form.html.erb

@@ -1,6 +1,7 @@
 <%= tabular_fields_for @unit, form: form_tag do |form| %>
-  <%- tag.tr id: row, class: "form", onkeydown: "formProcessKey(event)",
-    data: {link: link, form: form_tag, hidden_row: hidden_row} do %>
+  <%- tag.tr id: row, class: "form",
+    data: {controller: 'form', action: 'keydown->form#processKey',
+           link: link, form: form_tag, hidden_row: hidden_row} do %>
 
     <td style="--depth:<%= @unit.base_id? ? 1 : 0 %>">
       <%= form.text_field :symbol, required: true, autofocus: true, size: 12 %>

app/views/units/_unit.html.erb

@@ -1,13 +1,13 @@
 <%= tag.tr id: dom_id(unit),
-           ondragstart: "dragStart(event)", ondragend: "dragEnd(event)",
-           ondragover: "dragOver(event)", ondrop: "drop(event)",
-           ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
-           data: {drag_path: rebase_unit_path(unit),
-                  drop_id: dom_id(unit.base || unit),
-                  drop_id_param: "unit[base_id]"} do %>
+           draggable: true,
+           data: {controller: 'drag',
+                  action: 'dragstart->drag#start dragend->drag#end dragover->drag#over drop->drag#drop dragenter->drag#enter dragleave->drag#leave',
+                  drag_drag_path_value: rebase_unit_path(unit),
+                  drag_drop_id_value: dom_id(unit.base || unit),
+                  drag_drop_id_param_value: 'unit[base_id]'} do %>
 
   <td style="--depth:<%= unit.base_id? ? 1 : 0 %>">
-    <%= link_to unit, edit_unit_path(unit), class: 'link', onclick: 'this.blur();',
+    <%= link_to unit, edit_unit_path(unit), class: 'link',
       data: {turbo_stream: true} %>
   </td>
   <td><%= unit.description %></td>
@@ -17,7 +17,7 @@
     <td class="flex">
       <% unless unit.base_id? %>
         <%= image_link_to t('.new_subunit'), 'plus-outline', new_unit_path(unit),
-          id: dom_id(unit, :new, :link), onclick: 'this.blur();', data: {turbo_stream: true} %>
+          id: dom_id(unit, :new, :link), data: {turbo_stream: true} %>
       <% end %>
 
       <%= image_button_to_if unit.movable?, t('.destroy'), 'delete-outline', unit_path(unit),

app/views/units/index.html.erb

@@ -1,7 +1,7 @@
 <div class="rightside-area buttongrid">
   <% if current_user.at_least(:active) %>
     <%= image_link_to t('.new_unit'), 'plus-outline', new_unit_path,
-      id: dom_id(Unit, :new, :link), onclick: 'this.blur();', data: {turbo_stream: true} %>
+      id: dom_id(Unit, :new, :link), data: {turbo_stream: true} %>
   <% end %>
   <%= image_link_to t('.import_units'), 'download-outline', default_units_path,
     class: 'tools-area' %>
@@ -22,9 +22,10 @@
       <% end %>
     </tr>
     <%= tag.tr id: "unit_", hidden: true,
-               ondragover: "dragOver(event)", ondrop: "drop(event)",
-               ondragenter: "dragEnter(event)", ondragleave: "dragLeave(event)",
-               data: {drop_id: "unit_", drop_id_param: "unit[base_id]"} do %>
+               data: {controller: 'drag',
+                      action: 'dragover->drag#over drop->drag#drop dragenter->drag#enter dragleave->drag#leave',
+                      drag_drop_id_value: 'unit_',
+                      drag_drop_id_param_value: 'unit[base_id]'} do %>
       <th colspan="5"><%= t '.top_level_drop' %></th>
     <% end %>
   </thead>

app/views/users/profiles/new.html.erb

@@ -1,5 +1,5 @@
 <%= labeled_form_for resource, url: user_registration_path,
-  html: {class: 'main-area', onsubmit: 'formValidate(event)'} do |f| %>
+  html: {class: 'main-area', data: {controller: 'form', action: 'submit->form#validate'}} do |f| %>
 
   <%= f.email_field :email, required: true, size: 30, autofocus: true,
     autocomplete: 'email' %>

app/views/users/sessions/new.html.erb

@@ -1,5 +1,5 @@
 <%= labeled_form_for resource, url: user_session_path,
-  html: {class: 'main-area', onsubmit: 'formValidate(event)'} do |f| %>
+  html: {class: 'main-area', data: {controller: 'form', action: 'submit->form#validate'}} do |f| %>
 
   <%= f.email_field :email, required: true, size: 30, autofocus: true,
     autocomplete: 'email' %>

config/application.rb.dist

@@ -20,10 +20,6 @@ Bundler.require(*Rails.groups)
 
 module FixinMe
   class Application < Rails::Application
-    # Allow RAILS_DATABASE_YML to override the database config file path.
-    # Used by `rails test:all_databases` to test against multiple DB adapters.
-    config.paths['config/database'] = [ENV['RAILS_DATABASE_YML']] if ENV['RAILS_DATABASE_YML']
-
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 7.0
 

config/credentials.yml.enc

@@ -1 +1 @@
-3nm9KZNtyLhPgZBVzOOkN2FXHD0uEMuzgb5Sl1MrAMmi6+iEFSzyTHfZFW2mz18VyNz5DDYvTODZqBDQKK+FQh70uEQkmGqaY5XsTOzUFzk56quaPNtZvFEGux1nX2avSbYQBs3HeyYyWyTAFhez5j8tVb6sZD2xZ8twa9KAB42j86NIHT9w/ZMFqZbGbdBoR1Mrqoy9/IWv2QgxMTpGR6JBpTUwauXm6wS/bTt8SCXF57JSVgvdw/BxFzoA3Xj6N5E89LbMfh54W2ruMhybka5E7zXN9z0v4oXt8GiYZFIODEYZwqzEVaUK1WXS5qb5OrDJFAzs29Uf/gDrIDx71Lot+jejCS+xFfI9454EnHcVH66wKuwF6ylKupJDffM0hQHplcEfVSq5UiDfbPXm46Vr0g1A--2RrmuzCBuHvYpPNA--ugbuRe7ivfDqeUCt6ahciA==
+yQ/e5AEwReoZ6yiIqCZjBbl2Tp41JNcuwfWF3FeSSk2K0XBtE+VQXHlAHMBPRwbBdkutB8jls+YKou3JX58j88BEH3Ft/8h7GIepYF+nOhdb79y05lqEhARA4IZYnHe1Do72MdmseE0ectfDpfk6Q1qnfiTFe3X1KyfLR0hiSEM5+1ZYfk2loUBWSIfgYuqtK7bEOZiL6imU46n4+58g3VZd0cK7getT7rwNlVt1s6ME9PTwT/RqE736fLEIyDeaEg8hBxTrPVeYyii2o4IWM02/0HsuRPxXLLQAgXyzHhlT9wo18X5FaaecgGloBie0UMrPS3j6oBlVn61WQbkuEe/yQKnzyiw0v5HSmzME4PiDTaSW2em/BtGiMAhJpyukipQa4/leR3OTJxv3TAMha1bnk/OC--QU+gjSEvBsZpr3XT--osCoTfqZ4ENeas+nFdXefA==

config/database.yml.dist

@@ -48,26 +48,3 @@ production:
 #test:
 #  <<: *default
 #  database: fixinme_test
-
-# Multi-database testing — `bundle exec rails test:all_databases`
-# ---------------------------------------------------------------
-# Add any number of `test_<name>:` blocks to run the full test suite
-# against additional database adapters in a single command.
-# Each adapter's gem must be available in the bundle:
-#   bundle config --local with "mysql:sqlite"   # mysql + sqlite
-#   bundle config --local with "mysql:pg"       # mysql + postgresql
-#
-# Example — run tests against MySQL and SQLite:
-#
-#test_sqlite:
-#  adapter: sqlite3
-#  database: db/fixinme_test.sqlite3
-#
-# Example — run tests against MySQL and PostgreSQL:
-#
-#test_pg:
-#  adapter: postgresql
-#  database: fixinme_test
-#  username: fixinme
-#  password: Some-password1%
-#  host: localhost

config/environments/test.rb

@@ -58,4 +58,7 @@ Rails.application.configure do
   # config.action_view.annotate_rendered_view_with_filenames = true
 
   config.log_level = :info
+
+  # Allow Capybara's dynamic test server host (127.0.0.1:<random_port>)
+  config.hosts << '127.0.0.1'
 end

config/importmap.rb

@@ -2,3 +2,6 @@
 
 pin "application", preload: true
 pin "@hotwired/turbo-rails", to: "turbo.min.js", preload: true
+pin "@hotwired/stimulus", to: "stimulus.min.js", preload: true
+pin "@hotwired/stimulus-loading", to: "stimulus-loading.js", preload: true
+pin_all_from "app/javascript/controllers", under: "controllers"

config/locales/en.yml

@@ -11,8 +11,13 @@ en:
   activerecord:
     attributes:
       quantity:
+        default_unit: Default unit
         description: Description
         name: Name
+      readout:
+        created_at: Recorded at
+        taken_at: Taken at
+        value: Value
       unit:
         base: Base unit
         description: Description
@@ -81,6 +86,11 @@ en:
       revert: Revert
       sign_out: Sign out
       source_code: Get code
+  readouts:
+    form:
+      set_default_unit: Set as default unit
+  charts:
+    navigation: Charts
   measurements:
     navigation: Measurements
     no_items: There are no measurements taken. You can Add some now.
@@ -89,6 +99,21 @@ en:
       taken_at_html: Measurement taken at 
     index:
       new_measurement: Add measurement
+      view_compact: Compact view
+      view_wide: Wide view
+      view_charts: Charts
+    readout:
+      edit: Edit
+      destroy: Delete
+    create:
+      success:
+        one: Recorded 1 measurement.
+        other: Recorded %{count} measurements.
+      no_readouts: No readouts selected.
+    update:
+      success: Measurement updated.
+    destroy:
+      success: Measurement deleted.
   quantities:
     navigation: Quantities
     no_items: There are no configured quantities. You can Add some or Import from defaults.

config/routes.rb

@@ -1,5 +1,6 @@
 Rails.application.routes.draw do
   resources :measurements
+  resources :charts, only: [:index]
 
   resources :readouts, only: [:new] do
     collection {get 'new/:id/discard', action: :discard, as: :discard}

db/migrate/20260402000000_add_taken_at_to_readouts.rb

@@ -0,0 +1,6 @@
+class AddTakenAtToReadouts < ActiveRecord::Migration[7.2]
+  def change
+    add_column :readouts, :taken_at, :datetime
+    add_index :readouts, [:user_id, :taken_at]
+  end
+end

db/migrate/20260403000000_add_default_unit_to_quantities.rb

@@ -0,0 +1,5 @@
+class AddDefaultUnitToQuantities < ActiveRecord::Migration[7.2]
+  def change
+    add_reference :quantities, :default_unit, foreign_key: {to_table: :units}, null: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2025_01_21_230456) do
+ActiveRecord::Schema[7.2].define(version: 2026_04_03_000000) do
   create_table "quantities", charset: "utf8mb4", collation: "utf8mb4_0900_as_ci", force: :cascade do |t|
     t.bigint "user_id"
     t.string "name", limit: 31, null: false
@@ -20,6 +20,8 @@ ActiveRecord::Schema[7.2].define(version: 2025_01_21_230456) do
     t.datetime "updated_at", null: false
     t.integer "depth", default: 0, null: false
     t.string "pathname", limit: 511, null: false
+    t.bigint "default_unit_id"
+    t.index ["default_unit_id"], name: "index_quantities_on_default_unit_id"
     t.index ["parent_id"], name: "index_quantities_on_parent_id"
     t.index ["user_id", "parent_id", "name"], name: "index_quantities_on_user_id_and_parent_id_and_name", unique: true
     t.index ["user_id"], name: "index_quantities_on_user_id"
@@ -32,10 +34,12 @@ ActiveRecord::Schema[7.2].define(version: 2025_01_21_230456) do
     t.decimal "value", precision: 30, scale: 15, null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
+    t.datetime "taken_at"
     t.index ["quantity_id", "created_at"], name: "index_readouts_on_quantity_id_and_created_at", unique: true
     t.index ["quantity_id"], name: "index_readouts_on_quantity_id"
     t.index ["unit_id"], name: "index_readouts_on_unit_id"
     t.index ["user_id"], name: "index_readouts_on_user_id"
+    t.index ["user_id", "taken_at"], name: "index_readouts_on_user_id_and_taken_at"
   end
 
   create_table "units", charset: "utf8mb4", collation: "utf8mb4_0900_as_ci", force: :cascade do |t|
@@ -70,6 +74,7 @@ ActiveRecord::Schema[7.2].define(version: 2025_01_21_230456) do
   end
 
   add_foreign_key "quantities", "quantities", column: "parent_id", on_delete: :cascade
+  add_foreign_key "quantities", "units", column: "default_unit_id"
   add_foreign_key "quantities", "users"
   add_foreign_key "readouts", "quantities"
   add_foreign_key "readouts", "units"

db/seeds.rb

@@ -21,3 +21,4 @@ end
 #[Source, Quantity, Unit].each { |model| model.defaults.delete_all }
 
 require_relative 'seeds/units.rb'
+require_relative 'seeds/demo.rb'

db/seeds/demo.rb

@@ -0,0 +1,87 @@
+demo_email = 'demo@localhost'
+
+User.transaction do
+  break if User.find_by(email: demo_email)
+
+  demo = User.create! email: demo_email, password: 'demo123', status: :active do |user|
+    user.skip_confirmation!
+    print "Creating demo account '#{user.email}' with password '#{user.password}'..."
+  end
+  puts "done."
+
+  # --- Units ---
+  u = {}
+  u[:kg]  = demo.units.create! symbol: 'kg',  description: 'kilogram'
+  u[:g]   = demo.units.create! symbol: 'g',   description: 'gram',       base: u[:kg], multiplier: 1e-3
+  u[:cm]  = demo.units.create! symbol: 'cm',  description: 'centimetre'
+  u[:bpm] = demo.units.create! symbol: 'bpm', description: 'beats per minute'
+  u[:pct] = demo.units.create! symbol: '%',   description: 'percent'
+  u[:h]   = demo.units.create! symbol: 'h',   description: 'hour'
+  u[:min] = demo.units.create! symbol: 'min', description: 'minute',     base: u[:h], multiplier: (1.0/60).round(10)
+  u[:kcal]= demo.units.create! symbol: 'kcal',description: 'kilocalorie'
+  u[:mg]  = demo.units.create! symbol: 'mg',  description: 'milligram',  base: u[:kg], multiplier: 1e-6
+  u[:mmhg]= demo.units.create! symbol: 'mmHg',description: 'millimetre of mercury'
+
+  # --- Quantities ---
+  body      = demo.quantities.create! name: 'Body'
+  weight    = demo.quantities.create! name: 'Weight',        parent: body
+  height    = demo.quantities.create! name: 'Height',        parent: body
+  fat       = demo.quantities.create! name: 'Body fat',      parent: body
+
+  cardio    = demo.quantities.create! name: 'Cardiovascular'
+  hr_rest   = demo.quantities.create! name: 'Resting HR',    parent: cardio
+  hr_peak   = demo.quantities.create! name: 'Peak HR',       parent: cardio
+  bp_sys    = demo.quantities.create! name: 'BP systolic',   parent: cardio
+  bp_dia    = demo.quantities.create! name: 'BP diastolic',  parent: cardio
+
+  activity  = demo.quantities.create! name: 'Activity'
+  sleep_dur = demo.quantities.create! name: 'Sleep',         parent: activity
+  calories  = demo.quantities.create! name: 'Calories out',  parent: activity
+
+  nutrition = demo.quantities.create! name: 'Nutrition'
+  cal_in    = demo.quantities.create! name: 'Calories in',   parent: nutrition
+  caffeine  = demo.quantities.create! name: 'Caffeine',      parent: nutrition
+
+  # --- Readouts (60 days of daily-ish data) ---
+  base_time = 60.days.ago.beginning_of_day
+  rng = Random.new(42)
+
+  weight_val  = 82.4
+  fat_val     = 21.5
+  hr_rest_val = 62.0
+
+  60.times do |i|
+    t = base_time + i.days + rng.rand(3600 * 2)
+
+    weight_val  += rng.rand(-0.3..0.3)
+    fat_val     += rng.rand(-0.15..0.15)
+    hr_rest_val += rng.rand(-1.5..1.5)
+    hr_rest_val  = hr_rest_val.clamp(52, 72)
+
+    demo.readouts.create! quantity: weight,   unit: u[:kg],  value: weight_val.round(1),  created_at: t
+    demo.readouts.create! quantity: fat,      unit: u[:pct], value: fat_val.round(1),     created_at: t
+    demo.readouts.create! quantity: hr_rest,  unit: u[:bpm], value: hr_rest_val.round,    created_at: t
+
+    if i % 2 == 0
+      demo.readouts.create! quantity: bp_sys,  unit: u[:mmhg], value: (115 + rng.rand(-8..8)).round, created_at: t
+      demo.readouts.create! quantity: bp_dia,  unit: u[:mmhg], value: (75  + rng.rand(-5..5)).round,  created_at: t
+    end
+
+    if i % 3 == 0
+      demo.readouts.create! quantity: hr_peak, unit: u[:bpm], value: (155 + rng.rand(-10..10)).round, created_at: t
+    end
+
+    demo.readouts.create! quantity: sleep_dur, unit: u[:h],   value: (6.5 + rng.rand(-1.5..1.5)).round(1), created_at: t
+    demo.readouts.create! quantity: calories,  unit: u[:kcal],value: (2100 + rng.rand(-300..300)).round,    created_at: t
+    demo.readouts.create! quantity: cal_in,    unit: u[:kcal],value: (1900 + rng.rand(-400..400)).round,    created_at: t
+
+    if i % 4 == 0
+      demo.readouts.create! quantity: caffeine, unit: u[:mg], value: (200 + rng.rand(-80..80)).round, created_at: t
+    end
+  end
+
+  # height is stable — record once
+  demo.readouts.create! quantity: height, unit: u[:cm], value: 178.0, created_at: base_time
+
+  puts "  Created #{demo.units.count} units, #{demo.quantities.count} quantities, #{demo.readouts.count} readouts."
+end

lib/tasks/test_databases.rake

@@ -1,118 +0,0 @@
-require 'yaml'
-require 'erb'
-require 'tmpdir'
-
-namespace :test do
-  desc <<~DESC
-    Run the full test suite against every test database configured in database.yml.
-
-    Any top-level key that starts with "test" and contains a Hash is treated as a
-    test database configuration:
-
-      test:           # always required — the primary test database
-        adapter: mysql2
-        database: fixinme_test
-        ...
-
-      test_sqlite:    # optional additional databases
-        adapter: sqlite3
-        database: db/fixinme_test.sqlite3
-
-      test_pg:
-        adapter: postgresql
-        database: fixinme_test
-        ...
-
-    For each database the task will:
-      1. Check that the required adapter gem is available (skip with warning if not).
-      2. Run `rails db:test:prepare` to create/migrate the database.
-      3. Run `rails test` and record pass/fail.
-
-    A summary is printed at the end. The task exits non-zero if any database fails.
-  DESC
-  task :all_databases do
-    db_file    = Rails.root.join('config', 'database.yml')
-    all        = YAML.safe_load(ERB.new(db_file.read).result, aliases: true) || {}
-    test_cfgs  = all.select { |k, v| k.to_s.start_with?('test') && v.is_a?(Hash) }
-    non_test   = all.reject { |k, _| k.to_s.start_with?('test') }
-
-    abort "No test database configurations found in #{db_file}." if test_cfgs.empty?
-
-    results = {}
-
-    test_cfgs.each do |name, config|
-      adapter = config['adapter'].to_s
-
-      puts "\n#{'─' * 64}"
-      puts "  #{name}  (adapter: #{adapter})"
-      puts '─' * 64
-
-      unless adapter_available?(adapter)
-        puts "  SKIPPED — gem for '#{adapter}' adapter not available in bundle."
-        puts "  Add it to Gemfile (e.g. `bundle config --local with #{adapter_group(adapter)}`)"
-        results[name] = :skipped
-        next
-      end
-
-      Dir.mktmpdir('rails_test_db_') do |tmpdir|
-        tmp_yml = File.join(tmpdir, 'database.yml')
-        # Write a standalone database.yml with just this config as `test:`
-        # (non-test configs are preserved so boot doesn't fail on `production:` lookup)
-        File.write(tmp_yml, non_test.merge('test' => config).to_yaml)
-
-        env = { 'RAILS_DATABASE_YML' => tmp_yml }
-
-        if system(env, 'bundle exec rails db:test:prepare')
-          results[name] = system(env, 'bundle exec rails test') ? :pass : :fail
-        else
-          results[name] = :prepare_failed
-        end
-      end
-    end
-
-    puts "\n#{'═' * 64}"
-    puts "  SUMMARY"
-    puts '═' * 64
-    results.each do |name, status|
-      adapter = test_cfgs[name]['adapter']
-      icon    = { pass: '✓', fail: '✗', prepare_failed: '✗', skipped: '–' }[status]
-      label   = { pass: 'PASS', fail: 'FAIL',
-                  prepare_failed: 'PREPARE FAILED', skipped: 'SKIPPED' }[status]
-      puts "  #{icon}  #{name.ljust(26)} (#{adapter.ljust(12)})  #{label}"
-    end
-    puts '═' * 64
-
-    failed = results.count { |_, s| s == :fail || s == :prepare_failed }
-    abort "\n  #{failed} database(s) failed." if failed > 0
-  end
-end
-
-private
-
-# Returns true if the gem required for this adapter is loadable.
-ADAPTER_GEMS = {
-  'mysql2'     => 'mysql2',
-  'sqlite3'    => 'sqlite3',
-  'postgresql' => 'pg',
-  'pg'         => 'pg',
-}.freeze
-
-def adapter_available?(adapter)
-  gem_name = ADAPTER_GEMS.fetch(adapter, adapter)
-  require gem_name
-  true
-rescue LoadError
-  false
-end
-
-# Returns the Bundler group name that installs the adapter gem.
-ADAPTER_GROUPS = {
-  'mysql2'     => 'mysql',
-  'sqlite3'    => 'sqlite',
-  'postgresql' => 'postgresql',
-  'pg'         => 'postgresql',
-}.freeze
-
-def adapter_group(adapter)
-  ADAPTER_GROUPS.fetch(adapter, adapter)
-end

test/controllers/charts_controller_test.rb

@@ -0,0 +1,63 @@
+require "test_helper"
+
+class ChartsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    host! '127.0.0.1'
+    @user = users(:alice)
+    post new_user_session_path, params: { user: { email: @user.email, password: 'alice' } }
+    @quantity = @user.quantities.create!(name: 'Weight')
+    @unit = @user.units.create!(symbol: 'kg')
+  end
+
+  test "requires authentication" do
+    delete destroy_user_session_path
+    get charts_path
+    assert_response :redirect
+  end
+
+  test "index returns ok" do
+    get charts_path
+    assert_response :success
+  end
+
+  test "embeds readout data as JSON in script tag" do
+    users(:alice).readouts.create!(quantity: @quantity, unit: @unit, value: 82.5, taken_at: 1.day.ago)
+
+    get charts_path
+
+    assert_select 'script#charts-data[type="application/json"]' do |elements|
+      data = JSON.parse(elements.first.children.first.to_s)
+      assert_equal 1, data.size
+      assert_equal 'Weight', data.first['quantityName']
+      assert_in_delta 82.5, data.first['value']
+      assert_equal 'kg', data.first['unit']
+      assert_not_nil data.first['takenAt']
+    end
+  end
+
+  test "orders readouts by taken_at ascending" do
+    older = users(:alice).readouts.create!(quantity: @quantity, unit: @unit, value: 80.0, taken_at: 2.days.ago)
+    newer = users(:alice).readouts.create!(quantity: @quantity, unit: @unit, value: 82.5, taken_at: 1.day.ago)
+
+    get charts_path
+
+    assert_select 'script#charts-data[type="application/json"]' do |elements|
+      data = JSON.parse(elements.first.children.first.to_s)
+      assert_equal older.taken_at.iso8601, data.first['takenAt']
+      assert_equal newer.taken_at.iso8601, data.last['takenAt']
+    end
+  end
+
+  test "does not expose other users readouts" do
+    bob_quantity = users(:bob).quantities.create!(name: 'Steps')
+    bob_unit = users(:bob).units.create!(symbol: 'steps')
+    users(:bob).readouts.create!(quantity: bob_quantity, unit: bob_unit, value: 5000, taken_at: 1.day.ago)
+
+    get charts_path
+
+    assert_select 'script#charts-data[type="application/json"]' do |elements|
+      data = JSON.parse(elements.first.children.first.to_s)
+      assert data.none? { |r| r['quantityName'] == 'Steps' }, "Bob's data must not appear"
+    end
+  end
+end

test/controllers/measurements_controller_test.rb

@@ -1,8 +1,65 @@
 require "test_helper"
 
 class MeasurementsControllerTest < ActionDispatch::IntegrationTest
-  #test "should get index" do
-  #  get measurements_index_url
-  #  assert_response :success
-  #end
+  setup do
+    host! '127.0.0.1'
+    @user = users(:alice)
+    post new_user_session_path, params: { user: { email: @user.email, password: 'alice' } }
+    @quantity = @user.quantities.create!(name: 'Weight')
+    @unit = @user.units.create!(symbol: 'kg')
+  end
+
+  test "index returns ok" do
+    get measurements_path
+    assert_response :success
+  end
+
+  test "index requires authentication" do
+    delete destroy_user_session_path
+    get measurements_path
+    assert_response :redirect
+  end
+
+  test "create records readout with taken_at" do
+    taken_at = 1.day.ago.change(usec: 0)
+    assert_difference -> { @user.readouts.count } do
+      post measurements_path, params: {
+        taken_at: taken_at.iso8601,
+        readouts: [{ quantity_id: @quantity.id, value: '82.5', unit_id: @unit.id }]
+      }, as: :turbo_stream
+    end
+    assert_response :success
+    assert_equal taken_at, @user.readouts.last.taken_at
+  end
+
+  test "create with no readouts selected shows alert" do
+    post measurements_path, params: { taken_at: Time.now.iso8601 }, as: :turbo_stream
+    assert_response :success
+  end
+
+  test "destroy removes readout" do
+    readout = @user.readouts.create!(quantity: @quantity, unit: @unit, value: 82.5, taken_at: 1.day.ago)
+    assert_difference -> { @user.readouts.count }, -1 do
+      delete measurement_path(readout), as: :turbo_stream
+    end
+    assert_response :success
+  end
+
+  test "destroy cannot remove another user's readout" do
+    other_quantity = users(:bob).quantities.create!(name: 'Weight')
+    other_unit = users(:bob).units.create!(symbol: 'kg')
+    readout = users(:bob).readouts.create!(quantity: other_quantity, unit: other_unit, value: 70.0, taken_at: 1.day.ago)
+    assert_no_difference -> { users(:bob).readouts.count } do
+      delete measurement_path(readout), as: :turbo_stream
+    end
+  end
+
+  test "update changes readout value" do
+    readout = @user.readouts.create!(quantity: @quantity, unit: @unit, value: 82.5, taken_at: 1.day.ago)
+    patch measurement_path(readout), params: {
+      readout: { value: '83.0', unit_id: @unit.id, taken_at: readout.taken_at.iso8601 }
+    }, as: :turbo_stream
+    assert_response :success
+    assert_in_delta 83.0, readout.reload.value
+  end
 end

test/system/charts_test.rb

@@ -0,0 +1,26 @@
+require "application_system_test_case"
+
+class ChartsTest < ApplicationSystemTestCase
+  setup do
+    @user = sign_in(user: users(:alice))
+    @quantity = @user.quantities.create!(name: 'Weight')
+    @unit = @user.units.create!(symbol: 'kg')
+    @user.readouts.create!(quantity: @quantity, unit: @unit, value: 82.5, taken_at: 1.day.ago)
+    @user.readouts.create!(quantity: @quantity, unit: @unit, value: 83.1, taken_at: Time.now)
+    visit charts_path
+  end
+
+  test "charts page is reachable from navigation" do
+    visit root_path
+    click_on t('charts.navigation')
+    assert_current_path charts_path
+  end
+
+  test "renders Plotly chart panel" do
+    assert_selector '#measurements-charts .chart-panel', wait: 5
+  end
+
+  test "chart legend shows quantity name with unit" do
+    assert_text 'Weight (kg)', wait: 5
+  end
+end

test/system/measurements_test.rb

@@ -0,0 +1,64 @@
+require "application_system_test_case"
+
+class MeasurementsTest < ApplicationSystemTestCase
+  setup do
+    @user = sign_in(user: users(:alice))
+
+    @quantity = @user.quantities.create!(name: 'Weight')
+    @unit = @user.units.create!(symbol: 'kg')
+    @readout = @user.readouts.create!(quantity: @quantity, unit: @unit, value: 82.5)
+
+    visit measurements_path
+  end
+
+  test "index shows quantity name as edit link for active user" do
+    within 'tbody' do
+      assert_selector :link, exact_text: @quantity.name
+    end
+  end
+
+  test "edit opens inline form on quantity link click" do
+    within 'tbody' do
+      click_on @quantity.name
+      assert_selector ':focus'
+      assert_selector 'input[name="readout[value]"]'
+    end
+  end
+
+  test "edit and update measurement value" do
+    within 'tbody' do
+      click_on @quantity.name
+      fill_in 'readout[value]', with: '83.1'
+      assert_difference ->{ @readout.reload.value }, 83.1 - @readout.value do
+        click_on t('helpers.submit.update')
+      end
+      assert_no_selector :fillable_field
+      assert_selector :link, exact_text: @quantity.name
+    end
+    assert_selector '.flash.notice', text: t('measurements.update.success')
+  end
+
+  test "cancel edit restores original row" do
+    within 'tbody' do
+      click_on @quantity.name
+      assert_selector 'input[name="readout[value]"]'
+      click_on t(:cancel)
+      assert_no_selector :fillable_field
+      assert_selector :link, exact_text: @quantity.name
+    end
+  end
+
+  test "wide view edit opens panel form" do
+    @readout.update!(taken_at: Time.now)
+    visit measurements_path
+    execute_script("localStorage.removeItem('measurements-view')")
+    visit measurements_path
+
+    find('button[data-view="wide"]').click
+    within '#measurements-wide' do
+      assert_text format("%.10g", 82.5), wait: 3
+      find('button.link').click
+    end
+    assert_selector '#measurement_edit_form input[name="readout[value]"]', wait: 5
+  end
+end

test/system/quantities_test.rb

@@ -0,0 +1,45 @@
+require "application_system_test_case"
+
+class QuantitiesTest < ApplicationSystemTestCase
+  setup do
+    @user = sign_in(user: users(:alice))
+    @unit = @user.units.create!(symbol: 'kg')
+    @quantity = @user.quantities.create!(name: 'Weight')
+    visit quantities_path
+  end
+
+  test "update button turns red when default unit changes" do
+    click_on 'Weight'
+
+    button = find('button[name=button]')
+    initial_color = evaluate_script("getComputedStyle(arguments[0]).backgroundColor", button)
+
+    select 'kg', from: 'quantity[default_unit_id]'
+
+    changed_color = evaluate_script("getComputedStyle(arguments[0]).backgroundColor", button)
+    refute_equal initial_color, changed_color, "Button color should change when default unit is altered"
+  end
+
+  test "saving default unit pre-selects it in measurements form" do
+    click_on 'Weight'
+    select 'kg', from: 'quantity[default_unit_id]'
+    click_on t('helpers.submit.update')
+    assert_selector '.flash.notice'
+
+    @quantity.reload
+    assert_equal @unit.id, @quantity.default_unit_id
+
+    visit measurements_path
+    find(:link_or_button, t('measurements.index.new_measurement')).click
+    assert_selector '#measurement_form'
+
+    within '#quantity_select' do
+      check 'Weight'
+    end
+    find('button[formaction]').click
+
+    within 'tbody#readouts' do
+      assert_selector "option[value='#{@unit.id}'][selected]"
+    end
+  end
+end

test/system/users_test.rb

@@ -229,7 +229,7 @@ class UsersTest < ApplicationSystemTestCase
       user = User.find_by_email!(first(:link).text)
       inject_button_to first('td:not(.link)'), "update status", user_path(user), method: :patch,
         params: {user: {status: User.statuses.keys.sample}}, data: {turbo: false}
-      click_on "update status"
+      execute_script("arguments[0].click()", find_button("update status"))
     end
     assert_title 'The change you wanted was rejected (422)'
   end