Add index on readouts(user_id, taken_at)

MeasurementsController#index orders by taken_at desc; without an index this scan grows linearly with the readout count. The composite index on (user_id, taken_at) covers both the implicit user_id filter from the association scope and the ORDER BY clause. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add taken_at to readouts and default unit to quantities
2026-04-04 10:20:55 +00:00 · 2026-04-03 22:01:52 +00:00 · 2026-03-25 18:42:24 +01:00 · 2026-03-22 01:06:38 +01:00 · 2026-03-19 20:30:16 +01:00 · 2026-03-06 01:42:32 +01:00
32 changed files with 582 additions and 366 deletions
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -0,0 +1,84 @@
+# 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)
+```
+
+## Database Requirements
+
+The database must support:
+- Recursive CTEs with `UPDATE`/`DELETE` (MySQL ≥ 8.0, PostgreSQL, or SQLite3)
+- Decimal precision of 30+ digits
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -0,0 +1,34 @@
+DESIGN
+======
+
+Below is a list of design decisions. The justification is to be consulted
+whenever a change is considered, to avoid regressions.
+
+### Data type for DB storage of numeric values (`decimal` vs `float`)
+
+* among database engines supported (by Rails), SQLite offers storage of
+  `decimal` data type with the lowest precision, equal to the precision of
+  `REAL` type (double precision float value, IEEE 754), but in a floating point
+  format,
+    * decimal types in other database engines offer greater precision, but store
+      data in a fixed point format,
+* biology-related values differ by several orders of magnitude; storing them in
+  fixed point format would only make sense if required precision would be
+  greater than that offered by floating point format,
+    * even then, fixed point would mean either bigger memory requirements or
+      worse precision for numbers close to scale limit,
+        * for a fixed point format to use the same 8 bytes of storage as IEEE
+          754, precision would need to be limited to 18 digits (4 bytes/9 digits)
+          and scale approximately half of that - 9,
+    * double precision floating point guarantees 15 digits of precision, which
+      is more than enough for all expected use cases,
+        * single precision floating point only guarntees 6 digits of precision,
+          which is estimated to be too low for some use cases (e.g. storing
+          latitude/longitude with a resolution grater than 100m)
+* double precision floating point (IEEE 754) is a standard that ensures
+  compatibility with all database engines,
+    * the same data format is used internally by Ruby as a `Float`; it
+      guarantees no conversions between storage and computation,
+    * as a standard with hardware implementations ensures both: computing
+      efficiency and hardware/3rd party library compatibility as opposed to Ruby
+      custom `BigDecimal` type
--- a/app/assets/images/pictograms/alert-outline.svg
+++ b/app/assets/images/pictograms/alert-outline.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path fill="#ffffff" d="M12,2L1,21H23M12,6L19.53,19H4.47M11,10V14H13V10M11,16V18H13V16" /></svg>
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M12,2L1,21H23M12,6L19.53,19H4.47M11,10V14H13V10M11,16V18H13V16" /></svg>
--- a/app/assets/images/pictograms/check-circle-outline.svg
+++ b/app/assets/images/pictograms/check-circle-outline.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path fill="#ffffff" d="M12 2C6.5 2 2 6.5 2 12S6.5 22 12 22 22 17.5 22 12 17.5 2 12 2M12 20C7.59 20 4 16.41 4 12S7.59 4 12 4 20 7.59 20 12 16.41 20 12 20M16.59 7.58L10 14.17L7.41 11.59L6 13L10 17L18 9L16.59 7.58Z" /></svg>
+<svg xmlns="http://www.w3.org/2000/svg" id="icon" viewBox="0 0 24 24"><path d="M12 2C6.5 2 2 6.5 2 12S6.5 22 12 22 22 17.5 22 12 17.5 2 12 2M12 20C7.59 20 4 16.41 4 12S7.59 4 12 4 20 7.59 20 12 16.41 20 12 20M16.59 7.58L10 14.17L7.41 11.59L6 13L10 17L18 9L16.59 7.58Z" /></svg>
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -18,10 +18,12 @@
 /* Strive for simplicity:
 * * style elements/tags only - if possible,
 * * replace element/tag name with class name - if element has to be styled
- * differently depending on context (e.g. form)
+ * differently depending on context (e.g. <form>, <table>, <a> as link/button),
+ * * styles with multiple selectors should have all selectors with same
+ * specificity, to allow proper rule specificity vs order management.
 *
- * NOTE: Style in a modular way, similar to how CSS @scope would be used,
- * to make transition easier once @scope is widely available */
+ * NOTE: style in a modular way, similar to how CSS @scope would be used,
+ * to make transition easier once @scope is widely available. */
 :root {
  --color-focus-gray: #f3f3f3;
  --color-border-gray: #dddddd;
@@ -53,17 +55,36 @@
 :focus-visible {
  outline: none;
 }
+/* NOTE: move to higher priority layer instead of using !important?; add CSS
+ * @layer requirements in README */
+[disabled] {
+  border-color: var(--color-border-gray) !important;
+  color: var(--color-border-gray) !important;
+  /* NOTE: cannot set cursor when `pointer-events: none`; can be fixed by setting
+   * `cursor` on wrapping element.
+  cursor: not-allowed; */
+  fill: var(--color-border-gray) !important;
+  pointer-events: none !important;
+}
+/* Styles set `display` without distinguishing between [hidden] elements, making
+ * them visible. */
+[hidden] {
+  display: none !important;
+}


 /* Color coding of input controls' background:
- *  blue - target for interaction with pointer
- *  gray - target for interaction with keyboard
- *  red - destructive, non-undoable action
+ *  blue - target for interaction with pointer,
+ *  gray - target for interaction with keyboard,
+ *  red - destructive, non-undoable action.
 */
+/* TODO: merge selectors using :is() */
+a,
 button,
 details,
 input,
 select,
+summary,
 textarea {
  background-color: inherit;
  font: inherit;
@@ -73,56 +94,24 @@ input,
 select {
  text-align: inherit;
 }
-a,
-button,
-input[type=submit] {
-  cursor: pointer;
-  text-decoration: none;
-  white-space: nowrap;
-}
-/* [hidden] submit controls cannot have `display` set as it makes them visible */
-.button,
-button:not([hidden]),
-input[type=submit]:not([hidden]),
-.tab {
-  align-items: center;
-  color: var(--color-gray);
-  display: flex;
-  fill: var(--color-gray);
-  font-weight: bold;
-}
-.button,
-button,
-input[type=submit] {
-  font-size: 0.8rem;
-  padding: 0.6em 0.5em;
-  width: fit-content;
-}
-input:not([type=submit]):not([type=checkbox]),
-select,
-summary,
-textarea {
-  padding: 0.2em 0.4em;
-}
-.button,
-button,
 input,
 select,
 summary,
 textarea {
-  border: solid 1px var(--color-gray);
+  border: 1px solid var(--color-gray);
  border-radius: 0.25em;
+  padding: 0.2em 0.4em;
 }
-[name=cancel],
-.auxiliary {
-  border-color: var(--color-border-gray);
-  color: var(--color-nav-gray);
-  fill: var(--color-nav-gray);
+svg {
+  height: 1.4em;
+  margin: 0 0.2em 0 0;
+  width: 1.4em;
+}
+svg:last-child {
+  margin-right: 0;
 }
-input[type=checkbox],
-svg,
 textarea {
-  margin: 0
+  margin: 0;
 }
 input[type=checkbox] {
  accent-color: var(--color-blue);
@@ -130,17 +119,20 @@ input[type=checkbox] {
  -webkit-appearance: none;
  display: flex;
  height: 1.1em;
+  margin: 0;
+  padding: 0;
  width: 1.1em;
 }
 input[type=checkbox]:checked {
  appearance: checkbox;
  -webkit-appearance: checkbox;
 }
-/* Hide spin buttons in input number fields */
-/* TODO: add spin buttons inside input[number]: before (-) and after (+) input */
+/* Hide spin buttons of <input type=number>. */
+/* TODO: add spin buttons inside <input type=number>: before (-) and after (+) input. */
 input[type=number] {
  appearance: textfield;
  -moz-appearance: textfield;
+  text-align: end;
 }
 input::-webkit-inner-spin-button {
  -webkit-appearance: none;
@@ -149,37 +141,108 @@ input::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
 }
-.button > svg,
-.tab > svg,
-button > svg {
-  height: 1.4em;
-  width: 1.4em;
+/* Text color of table form controls:
+ *  - black for row/table forms,
+ *  - inherited for internal (column specific) buttons/forms. */
+table input,
+table select,
+table summary,
+table textarea {
+  border-color: var(--color-border-gray);
 }
-.button > svg:not(:last-child),
-.tab > svg:not(:last-child),
-button > svg:not(:last-child) {
-  margin-right: 0.2em;
+table input,
+table select,
+table textarea {
+  padding-block: 0.375em;
 }
-/* TODO: move normal non-button links (<a>:hover/:focus) styling here (i.e.
- * page-wide, top-level) and remove from table.items - as the style should be
- * same everywhere */
-.button:focus-visible,
-button:focus-visible,
-input[type=submit]:focus-visible {
-  background-color: var(--color-focus-gray);
+table form input,
+table form select,
+table form summary,
+table form textarea {
+  color: inherit;
+}
+table svg:not(:only-child) {
+  height: 1.25em;
+  width: 1.25em;
 }
 input:focus-visible,
 select:focus-visible,
 select:focus-within,
-/* TODO: how to achieve summary:focus-within for ::details-content? */
+/* TODO: how to achieve `summary:focus-within` for `::details-content`? */
 summary:focus-visible,
 textarea:focus-visible {
  accent-color: var(--color-dark-blue);
  background-color: var(--color-focus-gray);
+  color: black;
 }
-.button:hover,
-button:hover,
-input[type=submit]:hover {
+input:hover,
+select:hover,
+summary:hover,
+textarea:hover {
+  border-color: var(--color-blue);
+  outline: 1px solid var(--color-blue);
+}
+select:hover,
+summary:hover {
+  color: black;
+  cursor: pointer;
+}
+/* TODO: style <details>/<summary> focus to match <select> as much as possible.
+summary:focus-visible::before,
+summary:hover::before {
+  background-color: black;
+}
+ */
+input:invalid,
+select:invalid,
+textarea:invalid {
+  border-color: var(--color-red);
+  outline-color: var(--color-red);
+}
+
+/* `.button`: button-styled <a>, <button>, <input type=submit>.
+ * `.link`: any other <a>.
+ * `.tab`: tab-styled <a>.
+ */
+.button,
+.link,
+.tab {
+  cursor: pointer;
+  text-decoration: none;
+  white-space: nowrap;
+}
+.button,
+.tab {
+  align-items: center;
+  color: var(--color-gray);
+  display: flex;
+  fill: var(--color-gray);
+  font-weight: bold;
+}
+.button {
+  border: 1px solid var(--color-gray);
+  border-radius: 0.25em;
+  font-size: 0.8rem;
+  padding: 0.6em 0.5em;
+  width: fit-content;
+}
+.link {
+  color: inherit;
+  text-decoration: underline 1px var(--color-border-gray);
+  text-underline-offset: 0.25em;
+}
+[name=cancel],
+.auxiliary {
+  border-color: var(--color-border-gray);
+  color: var(--color-nav-gray);
+  fill: var(--color-nav-gray);
+}
+.button:focus-visible,
+.tab:focus-visible,
+.tab:hover {
+  background-color: var(--color-focus-gray);
+}
+.button:hover {
  background-color: var(--color-blue);
  border-color: var(--color-blue);
  color: white;
@@ -189,32 +252,24 @@ input[type=submit]:hover {
  background-color: var(--color-red);
  border-color: var(--color-red);
 }
-input:hover,
-select:hover,
-summary:hover,
-textarea:hover {
-  border-color: var(--color-blue);
-  outline: solid 1px var(--color-blue);
+.link:focus-visible {
+  text-decoration-color: var(--color-gray);
 }
-select:hover,
-summary:hover {
-  cursor: pointer;
+.link:hover {
+  color: var(--color-blue);
+  text-decoration-color: var(--color-blue);
 }
-input:invalid,
-select:invalid,
-textarea:invalid {
-  border-color: var(--color-red);
-  outline: solid 1px var(--color-red);
-}
-input[type=text]:read-only,
-textarea:read-only {
-  border: none;
-  padding-inline: 0;
+table .button {
+  border-color: var(--color-border-gray);
+  color: var(--color-table-gray);
+  font-weight: normal;
+  height: 100%;
+  padding: 0.4em;
 }


-/* NOTE: collapse gaps around empty rows (`topside`) once possible
- * with grid-collapse property and remove alternative grid-template
+/* NOTE: collapse gaps around empty rows (`topside`) once possible with
+ * `grid-collapse` property and remove alternative `grid-template-areas`.
 * https://github.com/w3c/csswg-drafts/issues/5813 */
 body {
  display: grid;
@@ -222,16 +277,16 @@ body {
  grid-template-areas:
    "header    header  header"
    "nav       nav     nav"
-    "leftside  topside rightside"
    "leftside  main    rightside";
  grid-template-columns: 1fr minmax(max-content, 2fr) 1fr;
  font-family: system-ui;
  margin: 0.4em;
 }
-body:not(:has(.topside-area)) {
+body:has(> .topside-area) {
  grid-template-areas:
    "header    header  header"
    "nav       nav     nav"
+    "leftside  topside rightside"
    "leftside  main    rightside";
 }

@@ -247,18 +302,14 @@ header {
  margin-inline-start: 4%;
 }
 .navigation > .tab {
-  border-bottom: solid 2px var(--color-nav-gray);
+  border-bottom: 2px solid var(--color-nav-gray);
  flex: 1;
  font-size: 1rem;
  justify-content: center;
  padding-block: 0.4em;
 }
-.navigation > .tab:hover,
-.navigation > .tab:focus-visible {
-  background-color: var(--color-focus-gray);
-}
 .navigation > .tab.active {
-  border-bottom: solid 4px var(--color-blue);
+  border-bottom: 4px solid var(--color-blue);
  color: var(--color-blue);
  fill: var(--color-blue);
 }
@@ -290,7 +341,7 @@ header {

 #flashes {
  display: grid;
-  gap: 0.2em;
+  row-gap: 0.4em;
  grid-template-columns: 1fr auto auto auto 1fr;
  left: 0;
  pointer-events: none;
@@ -306,49 +357,42 @@ header {
  display: grid;
  grid-column: 2/5;
  grid-template-columns: subgrid;
+  line-height: 2.2em;
  pointer-events: auto;
 }
-.flash.alert:before {
-  content: url('pictograms/alert-outline.svg');
+.flash:before {
+  filter: invert();
  height: 1.4em;
  margin: 0 0.5em;
  width: 1.4em;
 }
+.flash.alert:before {
+  content: url('pictograms/alert-outline.svg');
+}
 .flash.alert {
  border-color: var(--color-red);
  background-color: var(--color-red);
 }
 .flash.notice:before {
  content: url('pictograms/check-circle-outline.svg');
-  height: 1.4em;
-  margin: 0 0.5em;
-  width: 1.4em;
 }
 .flash.notice {
  border-color: var(--color-blue);
  background-color: var(--color-blue);
 }
-.flash > div {
-  grid-column: 2;
-}
-/* NOTE: currently flash button inherits some unnecessary styles from generic
- * button. */
-.flash > button {
-  border: none;
-  color: inherit;
+.flash svg {
  cursor: pointer;
-  font-size: 1.4em;
-  font-weight: bold;
-  grid-column: 3;
+  fill: white;
+  height: 2.2em;
  opacity: 0.6;
-  padding: 0.2em 0.4em;
+  padding: 0.4em 0.5em;
+  width: 2.4em;
 }
-.flash > button:hover {
+.flash svg:hover {
  opacity: 1;
 }


-/* TODO: Hover over invalid should work like in measurements (thin vs thick border) */
 .labeled-form {
  align-items: center;
  display: grid;
@@ -365,7 +409,7 @@ header {
 .labeled-form label.required {
  font-weight: bold;
 }
-/* Don't style `label.error + input` if case already covered by input:invalid */
+/* Don't style `label.error + input` if case already covered by `input:invalid`. */
 .labeled-form label.error {
  color: var(--color-red);
 }
@@ -385,200 +429,117 @@ header {
 .labeled-form .auxiliary {
  grid-column: 3;
  /* If more buttons are needed, `grid-row` can be replaced with
-   * `reading-flow: grid-columns` to ensure proper tabindex order */
+   * `reading-flow: grid-columns` to ensure proper [tabindex] order. */
  grid-row: 1;
  height: 100%;
  padding-block: 0;
 }

+.tabular-form table {
+  border: none;
+  border-spacing: 0.4em 0;
+  margin-inline: -0.4em;
+}
+.tabular-form table td {
+  border: none;
+  vertical-align: middle;
+}
+.tabular-form table td {
+  padding-inline: 0;
+}
+.tabular-form table :is(form, input, select, textarea):only-child {
+  margin-inline-start: 0;
+}

-/* TODO: remove .items class (?) and make 'form table' work properly */
-table.items {
+
+.items-table {
  border-spacing: 0;
-  border: solid 1px var(--color-border-gray);
+  border: 1px solid var(--color-border-gray);
  border-radius: 0.25em;
  font-size: 0.85rem;
  text-align: left;
 }
-table:not(:has(tr)) {
-  display: none;
-}
-table.items thead {
+.items-table thead {
  font-size: 0.8rem;
 }
-table.items thead,
-table.items tbody tr:hover {
+.items-table thead,
+.items-table tbody tr:hover {
  background-color: var(--color-focus-gray);
 }
-table.items th {
-  padding-block: 0.75em;
+.items-table th {
+  padding: 0.75em 0 0.75em 1em;
  text-align: center;
 }
-table.items th,
-table.items td {
-  padding-inline: 1em 0;
-}
-/* For <a> to fill <td> completely, we use an ::after pseudoelement. */
-table.items td.link {
-  padding: 0;
-  position: relative;
-}
-table.items td.link a {
-  color: inherit;
-  font: inherit;
-}
-table.items td.link a::after {
-  content: '';
-  inset: 0;
-  position: absolute;
-}
-table.items td:first-child {
-  padding-inline-start: calc(1em + var(--depth) * 0.8em);
-}
-table.items td:has(input, select, textarea) {
-  padding-inline-start: calc(0.6em - 0.9px);
-}
-table.items td:first-child:has(input, select, textarea) {
-  padding-inline-start: calc(0.6em + var(--depth) * 0.8em - 0.9px);
-}
-table.items th:last-child {
+.items-table th:last-child {
  padding-inline-end: 0.4em;
 }
-table.items td:last-child {
+.items-table td {
+  border-top: 1px solid var(--color-border-gray);
+  height: 2.4em;
+  padding: 0.1em 0 0.1em calc(1em + var(--depth) * 0.8em);
+}
+.items-table td:last-child {
  padding-inline-end: 0.1em;
 }
-table.items td {
-  border-top: solid 1px var(--color-border-gray);
-  height: 2.4em;
-  padding-block: 0.1em;
+.items-table :is(form, input, select, textarea):only-child {
+  margin-inline-start: calc(-0.4em - 0.9px);
 }
-table.items .actions {
-  display: flex;
+/* For <a> to fill table cell completely, we use an `::after` pseudoelement. */
+/* TODO: expand to whole row? will require adjusting z-index on inputs/buttons */
+.items-table td:has(> .link) {
+  position: relative;
+}
+.items-table .link::after {
+  content: '';
+  inset: -1px 0 0 0;
+  position: absolute;
+}
+.items-table .flex {
  gap: 0.4em;
  justify-content: end;
 }
-table.items .actions.centered {
-  justify-content: center;
-}
-table.items tr.dropzone {
+.items-table .dropzone {
  position: relative;
 }
-table.items tr.dropzone::after {
+.items-table .dropzone::after {
  content: '';
  inset: 1px 0 0 0;
  position: absolute;
-  outline: dashed 2px var(--color-blue);
+  outline: 2px dashed var(--color-blue);
  outline-offset: -1px;
  z-index: var(--z-index-table-row-outline);
 }
-table.items td.handle {
-  cursor: move;
+.items-table .handle {
+  cursor: grab;
 }
-table.items tr.form td {
+.items-table .form td {
  vertical-align: top;
 }
-
-/* TODO: replace :hover:focus-visible combos with proper LOVE stye order */
-/* TODO: Update table styling: simplify selectors, deduplicate, remove non-font rem. */
-table.items td.link a:hover,
-table.items td.link a:focus-visible,
-table.items td.link a:hover:focus-visible {
-  text-decoration: underline;
-  text-decoration-thickness: 0.05rem;
-  text-underline-offset: 0.2rem;
-}
-table.items td.link a:hover {
-  color: var(--color-blue);
-}
-table.items td.link a:focus-visible {
-  text-decoration-color: var(--color-gray);
-}
-table.items td.link a:hover:focus-visible {
-  color: var(--color-dark-blue);
-}
-
-table.items td:not(:first-child),
+.items-table td:not(:first-child),
 .grayed {
  color: var(--color-table-gray);
-  fill: var(--color-table-gray);
+  fill: var(--color-gray);
 }
-table.items svg {
-  height: 1rem;
-  vertical-align: middle;
-  width: 1rem;
-}
-table.items svg:last-child {
-  height: 1.2rem;
-  width: 1.2rem;
-}
-table.items td.svg {
+.items-table td:has(> svg:only-child) {
  text-align: center;
 }
-table.items td.number {
-  text-align: right;
-}
-table.items .button,
-table.items button,
-table.items input[type=submit] {
-  font-weight: normal;
-  height: 100%;
-  padding: 0.4em;
-}
-table.items input:not([type=submit]):not([type=checkbox]),
-table.items select,
-table.items textarea {
-  padding-block: 0.375em;
-}
-/* TODO: find a way (layers?) to style inputs differently while making sure
- * hover works properly without using :not(:hover) selectors here. */
-table.items .button:not(:hover),
-table.items button:not(:hover),
-table.items input:not(:hover),
-table.items select:not(:hover),
-table.items textarea:not(:hover) {
-  border-color: var(--color-border-gray);
-}
-table.items .button:not(:hover),
-table.items button:not(:hover),
-table.items input[type=submit]:not(:hover),
-table.items select:not(:hover) {
-  color: var(--color-table-gray);
-}
-table.items select:focus-within,
-table.items select:focus-visible {
-  color: black;
-}
-form table.items {
-  border: none;
-}
-form table.items td {
-  border: none;
-  text-align: left;
-  vertical-align: middle;
-}
-form table.items td:first-child {
-  color: inherit;
-}


-.centered {
+.center {
  margin: 0 auto;
 }
-.extendedright {
-  margin-right: auto;
-}
 .hexpand {
  width: 100%;
 }
-.hflex {
+.flex {
  display: flex;
  gap: 0.8em;
 }
-.hflex.reverse {
+.flex.reverse {
  flex-direction: row-reverse;
 }
-.hflex.centered {
-  justify-content: center;
+.flex.vertical {
+  flex-direction: column;
 }
 .hint {
  color: var(--color-table-gray);
@@ -586,21 +547,18 @@ form table.items td:first-child {
  font-size: 0.9rem;
  text-align: center;
 }
-.vflex {
-  display: flex;
-  gap: 0.8em;
-  flex-direction: column;
+.hmin50 {
+  min-width: 50%;
 }
-[disabled] {
-/* label:has(input[disabled]) {
- * TODO: disabled checkbox blue square focus removal; disabled label styling;
- * focused label styling (currently only checkbox has focus)
- * */
-  border-color: var(--color-border-gray) !important;
-  color: var(--color-border-gray) !important;
-  cursor: not-allowed;
-  fill: var(--color-border-gray) !important;
-  pointer-events: none;
+.italic {
+  color: var(--color-gray);
+  font-style: italic;
+}
+.ralign {
+  text-align: right;
+}
+.rextend {
+  margin-right: auto;
 }


@@ -612,12 +570,12 @@ summary {
  align-items: center;
  color: var(--color-gray);
  display: flex;
-  gap: 0.2em;
+  gap: 0.4em;
  height: 100%;
  white-space: nowrap;
 }
 summary::before {
-  background-color: #000;
+  background-color: currentColor;
  content: "";
  height: 1em;
  mask-image: url('pictograms/chevron-down.svg');
@@ -629,7 +587,7 @@ summary:has(.button) {
  padding-inline-end: 0;
 }
 summary .button {
-  border: solid 1px var(--color-border-gray);
+  border: 1px solid var(--color-border-gray);
  border-radius: inherit;
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
@@ -640,15 +598,15 @@ summary span {
  width: 100%;
 }
 details[open] summary::before {
-  transform: rotate(180deg);
+  transform: scaleY(-1);
 }
 summary::marker {
  padding-left: 0.25em;
 }
-/* NOTE: use details[open]::details-content once widely available */
+/* NOTE: use `details[open]::details-content` once widely available. */
 details[open] ul {
-  background: white;
-  border: solid 1px var(--color-border-gray);
+  background-color: white;
+  border: 1px solid var(--color-border-gray);
  border-radius: 0.25em;
  box-shadow: 1px 1px 3px var(--color-border-gray);
  margin: -1px 0 0 0;
@@ -670,3 +628,15 @@ li input[type=checkbox] {
 li::marker {
  content: '';
 }
+/*
+ * TODO:
+ * * disable <label> containing disabled checkbox: `label:has(input[disabled])`,
+ * * disabled label styling,
+ * * focused label styling (currently only checkbox has focus),
+ * * disabled checkbox blue square focus removal.
+ * */
+
+#measurement_form {
+  min-width: 66%;
+  width: max-content;
+}
--- a/app/controllers/quantities_controller.rb
+++ b/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
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -12,6 +12,12 @@ module ApplicationHelper
      labeled_field_for(method, options) { super }
    end

+    def submit(value = nil, options = {})
+      value, options = nil, value if value.is_a?(Hash)
+      options[:class] = @template.class_names('button', options[:class])
+      super
+    end
+
    private

    def labeled_field_for(method, options)
@@ -80,6 +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|
@@ -96,20 +103,28 @@ module ApplicationHelper

    def number_field(method, options = {})
      attr_type = object.type_for_attribute(method)
-      if attr_type.type == :decimal
+      case attr_type.type
+      when :decimal
        options[:value] = object.public_send(method)&.to_scientific
        options[:step] ||= BigDecimal(10).power(-attr_type.scale)
        options[:max] ||= BigDecimal(10).power(attr_type.precision - attr_type.scale) -
          options[:step]
        options[:min] = options[:min] == :step ? options[:step] : options[:min]
        options[:min] ||= -options[:max]
+        options[:size] ||= attr_type.precision / 2
+      when :float
+        options[:size] ||= 6
      end
      super
    end

    def button(value = nil, options = {}, &block)
-      # button does not use #objectify_options
-      options.merge!(@options.slice(:form))
+      # #button does not use #objectify_options/@default_options
+      value, options = nil, value if value.is_a?(Hash)
+      options = options.merge(
+        @default_options.slice(:form),
+        class: @template.class_names('button', options[:class])
+      )
      super
    end

@@ -138,12 +153,14 @@ module ApplicationHelper
  end

  def tabular_form_with(**options, &block)
-    extra_options = {builder: TabularFormBuilder, html: {autocomplete: 'off'}}
+    extra_options = {builder: TabularFormBuilder, class: 'tabular-form',
+                     html: {autocomplete: 'off'}}
    form_with(**merge_attributes(options, extra_options), &block)
  end

  def svg_tag(source, label = nil, options = {})
-    svg_tag = tag.svg(options) do
+    label, options = nil, label if label.is_a? Hash
+    svg_tag = tag.svg(**options) do
      tag.use(href: "#{image_path(source + ".svg")}#icon")
    end
    label.blank? ? svg_tag : svg_tag + tag.span(label)
@@ -212,9 +229,8 @@ module ApplicationHelper
      # Conversion of flash to Array only required because of Devise
      Array(messages).map do |message|
        tag.div class: "flash #{entry}" do
-          # TODO: change button text to svg to make it aligned vertically
-          tag.div(sanitize(message)) + tag.button(sanitize("&times;"), tabindex: -1,
-                                                  onclick: "this.parentElement.remove();")
+          tag.span(sanitize(message)) +
+            svg_tag('pictograms/close-outline', {onclick: "this.parentElement.remove()"})
        end
      end
    end.join.html_safe
--- a/app/helpers/quantities_helper.rb
+++ b/app/helpers/quantities_helper.rb
@@ -1,9 +1,9 @@
 module QuantitiesHelper
-  def quantities_check_boxes
+  def quantities_check_boxes(quantities)
    # Closing <details> on focusout event depends on relatedTarget for internal
    # actions being non-null. To ensure this, all top-layer elements of
    # ::details-content must accept focus, e.g. <label> needs tabindex="-1" */
-    collection_check_boxes(nil, :quantity, @quantities, :id, :to_s_with_depth,
+    collection_check_boxes(nil, :quantity, quantities, :id, :to_s_with_depth,
                           include_hidden: false) do |b|
      content_tag :li, b.label(tabindex: -1) { b.check_box + b.text }
    end
--- a/app/models/quantity.rb
+++ b/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

--- a/app/models/readout.rb
+++ b/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
--- a/app/views/default/units/_unit.html.erb
+++ b/app/views/default/units/_unit.html.erb
@@ -5,7 +5,7 @@
  </td>

  <% if current_user.at_least(:active) %>
-    <td class="actions">
+    <td class="flex">
      <% unless unit.portable.nil? %>
        <% if unit.default? %>
          <%= image_button_to_if unit.portable?, t('.import'), 'download-outline',
--- a/app/views/default/units/index.html.erb
+++ b/app/views/default/units/index.html.erb
@@ -8,7 +8,7 @@
    class: 'tools-area' %>
 </div>

-<table class="main-area items">
+<table class="main-area items-table">
  <thead>
    <tr>
      <th><%= Unit.human_attribute_name(:symbol) %></th>
--- a/app/views/layouts/application.html.erb
+++ b/app/views/layouts/application.html.erb
@@ -23,10 +23,10 @@
  </head>

  <body>
-    <header class="hflex">
+    <header class="flex">
      <%= image_link_to t(".source_code"), "code-braces", source_code_url %>
      <%= image_link_to t(".issue_tracker"), "bug-outline", issue_tracker_url,
-            class: "extendedright" %>
+        class: "rextend" %>
      <% if user_signed_in? %>
        <%= image_link_to_unless_current(current_user, "account-wrench-outline",
          edit_user_registration_path) %>
--- a/app/views/measurements/_form.html.erb
+++ b/app/views/measurements/_form.html.erb
@@ -1,28 +1,37 @@
 <%= tabular_form_with model: Measurement.new, id: :measurement_form,
-  class: 'topside-area vflex', html: {onkeydown: 'formProcessKey(event)'} do |form| %>
-  <table class="items centered">
-    <tbody id="readouts"></tbody>
+  class: 'topside-area flex vertical center',
+  html: {onkeydown: 'formProcessKey(event)'} do |form| %>
+
+  <table class="items-table center">
+    <tbody id="readouts">
+      <%= tabular_fields_for @measurement do |form| %>
+        <tr class="italic">
+          <td class="hexpand hmin50"><%= t '.taken_at_html' %></td>
+          <td colspan="3" class="ralign">
+            <%= form.datetime_field :taken_at, required: true, value: Time.current.strftime('%Y-%m-%dT%H:%M') %>
+          </td>
+        </tr>
+      <% end %>
+    </tbody>
  </table>

-  <div class="hflex">
-    <%# TODO: right-click selection %>
-    <details id="quantity_select" class="hexpand" open
-             onkeydown="detailsProcessKey(event)">
-      <summary autofocus>
-        <!-- TODO: Set content with CSS when span empty to avoid duplication -->
-        <span data-prompt="<%= t('.select_quantity') %>">
-          <%= 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} %>
-      </summary>
-      <ul><%= quantities_check_boxes %></ul>
-    </details>
-    <%= form.button id: :create_measurement_button, disabled: true -%>
-  </div>
+  <%# TODO: right-click selection; unnecessary with hierarchical tags? %>
+  <details id="quantity_select" class="center hexpand" open
+           onkeydown="detailsProcessKey(event)">
+    <summary autofocus>
+      <!-- TODO: Set content with CSS when span empty to avoid duplication -->
+      <span data-prompt="<%= t('.select_quantity') %>">
+        <%= 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} %>
+    </summary>
+    <ul><%= quantities_check_boxes(@quantities) %></ul>
+  </details>

-  <div class="hflex reverse">
+  <div class="flex reverse">
+    <%= form.button id: :create_measurement_button, disabled: true -%>
    <%= image_link_to t(:cancel), "close-outline", measurements_path, name: :cancel,
      class: 'dangerous', onclick: render_turbo_stream('form_close') %>
  </div>
--- a/app/views/quantities/_form.html.erb
+++ b/app/views/quantities/_form.html.erb
@@ -8,8 +8,13 @@
    <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="actions">
+    <td class="flex">
      <%= form.button %>
      <%= image_link_to t(:cancel), "close-outline", quantities_path, class: 'dangerous',
        name: :cancel, onclick: render_turbo_stream('form_close', {row: row}) %>
--- a/app/views/quantities/_quantity.html.erb
+++ b/app/views/quantities/_quantity.html.erb
@@ -5,14 +5,15 @@
           data: {drag_path: reparent_quantity_path(quantity), drop_id: dom_id(quantity),
                  drop_id_param: "quantity[parent_id]"} do %>

-  <td class="link" style="--depth:<%= quantity.depth %>">
-    <%= link_to quantity, edit_quantity_path(quantity), onclick: 'this.blur();',
-      data: {turbo_stream: true} %>
+  <td style="--depth:<%= quantity.depth %>">
+    <%= link_to quantity, edit_quantity_path(quantity), class: 'link',
+      onclick: 'this.blur();', data: {turbo_stream: true} %>
  </td>
  <td><%= quantity.description %></td>
+  <td><%= quantity.default_unit&.symbol %></td>

  <% if current_user.at_least(:active) %>
-    <td class="actions">
+    <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} %>

--- a/app/views/quantities/index.html.erb
+++ b/app/views/quantities/index.html.erb
@@ -8,13 +8,15 @@
    class: 'tools-area' %>
 </div>

+<%# TODO: remove? form can be inserted directly, e.g. at the end of index %>
 <%= tag.div class: 'main-area', id: :quantity_form %>

-<table class="main-area items">
+<table class="main-area items-table">
  <thead>
    <tr>
      <th><%= Quantity.human_attribute_name(:name) %></th>
-      <th><%= Quantity.human_attribute_name(:description) %></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>
@@ -24,7 +26,7 @@
               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>
+      <th colspan="5"><%= t '.top_level_drop' %></th>
    <% end %>
  </thead>
  <tbody id="quantities">
--- a/app/views/readouts/_form.html.erb
+++ b/app/views/readouts/_form.html.erb
@@ -1,25 +1,31 @@
 <%# TODO: add readout reordering by dragging %>
 <%= tabular_fields_for 'readouts[]', readout do |form| %>
  <%- tag.tr id: dom_id(readout.quantity, :new, :readout) do %>
-    <td class="actions">
+    <td>
+      <%# TODO: add grayed readout index (in separate column?) %>
+      <%= readout.quantity.relative_pathname(@superquantity) %>
+      <%= form.hidden_field :quantity_id %>
+    </td>
+    <td>
+      <%= form.number_field :value, required: true, autofocus: readout_counter == 0 %>
+    </td>
+    <td>
+      <%= form.collection_select :unit_id, @user_units, :id,
+        ->(u){ sanitize('&emsp;' * (u.base_id ? 1 : 0) + u.symbol) },
+        {prompt: '', disabled: '', selected: readout.quantity.default_unit_id || ''}, required: true,
+        data: {default_unit_id: readout.quantity.default_unit_id || ''},
+        onchange: "readoutUnitChanged(this)" %>
+    </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)},
+        onclick: 'setDefaultUnit(this)' %>
      <%= image_button_tag '', 'delete-outline', class: 'dangerous', name: nil,
        formaction: discard_readouts_path(readout.quantity),
        formmethod: :get, formnovalidate: true, data: {turbo_stream: true} %>
    </td>
-    <td>
-      <%= readout.quantity.relative_pathname(@superquantity) %>
-    </td>
-    <td>
-      <%= form.number_field :value, required: true,
-        size: readout.type_for_attribute(:value).precision / 2,
-        autofocus: readout_counter == 0 %>
-    </td>
-    <td>
-      <%= form.hidden_field :quantity_id %>
-      <%= form.collection_select :unit_id, @user_units, :id,
-        ->(u){ sanitize('&emsp;' * (u.base_id ? 1 : 0) + u.symbol) },
-        {prompt: t('.select_unit'), disabled: '', selected: ''}, required: true %>
-    </td>
  <% end %>
 <% end %>
--- a/app/views/units/_form.html.erb
+++ b/app/views/units/_form.html.erb
@@ -8,11 +8,11 @@
    <td>
      <%= form.text_area :description, cols: 30, rows: 1, escape: false %>
    </td>
-    <td class="number">
+    <td>
      <%= form.number_field :multiplier, required: true, size: 10, min: :step if @unit.base_id? %>
    </td>

-    <td class="actions">
+    <td class="flex">
      <%= form.button %>
      <%= image_link_to t(:cancel), "close-outline", units_path, class: 'dangerous',
        name: :cancel, onclick: render_turbo_stream('form_close', {row: row}) %>
--- a/app/views/units/_unit.html.erb
+++ b/app/views/units/_unit.html.erb
@@ -6,14 +6,15 @@
                  drop_id: dom_id(unit.base || unit),
                  drop_id_param: "unit[base_id]"} do %>

-  <td class="link" style="--depth:<%= unit.base_id? ? 1 : 0 %>">
-    <%= link_to unit, edit_unit_path(unit), onclick: 'this.blur();', data: {turbo_stream: true} %>
+  <td style="--depth:<%= unit.base_id? ? 1 : 0 %>">
+    <%= link_to unit, edit_unit_path(unit), class: 'link', onclick: 'this.blur();',
+      data: {turbo_stream: true} %>
  </td>
  <td><%= unit.description %></td>
-  <td class="number"><%= unit.multiplier.to_html %></td>
+  <td class="ralign"><%= unit.multiplier.to_html %></td>

  <% if current_user.at_least(:active) %>
-    <td class="actions">
+    <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} %>
--- a/app/views/units/index.html.erb
+++ b/app/views/units/index.html.erb
@@ -7,13 +7,14 @@
    class: 'tools-area' %>
 </div>

+<%# TODO: remove? form can be inserted directly, e.g. at the end of index %>
 <%= tag.div id: :unit_form %>

-<table class="main-area items">
+<table class="main-area items-table">
  <thead>
    <tr>
      <th><%= Unit.human_attribute_name(:symbol) %></th>
-      <th><%= Unit.human_attribute_name(:description) %></th>
+      <th class="hexpand"><%= Unit.human_attribute_name(:description) %></th>
      <th><%= Unit.human_attribute_name(:multiplier) %></th>
      <% if current_user.at_least(:active) %>
        <th><%= t :actions %></th>
--- a/app/views/users/index.html.erb
+++ b/app/views/users/index.html.erb
@@ -1,4 +1,4 @@
-<table class="main-area items" id="users">
+<table class="main-area items-table" id="users">
  <thead>
    <tr>
      <th><%= User.human_attribute_name(:email) %></th>
@@ -11,7 +11,7 @@
  <tbody>
    <% @users.each do |user| %>
      <tr>
-        <td class="link"><%= link_to user, user_path(user) %></td>
+        <td><%= link_to user, user_path(user), class: 'link' %></td>
        <td>
          <% if user == current_user %>
            <%= user.status %>
@@ -22,11 +22,11 @@
            <% end %>
          <% end %>
        </td>
-        <td class="svg">
+        <td>
          <%= svg_tag 'pictograms/checkbox-marked-outline' if user.confirmed_at.present? %>
        </td>
        <td><%= l user.created_at, format: :without_tz %></td>
-        <td class="actions">
+        <td class="flex">
          <% if allow_disguise?(user) %>
            <%= image_link_to t('.disguise'), 'incognito', disguise_user_path(user) %>
          <% end %>
--- a/app/views/users/profiles/new.html.erb
+++ b/app/views/users/profiles/new.html.erb
@@ -10,7 +10,6 @@

  <%= f.submit t(:register), data: {turbo: false} %>

-  <%# TODO: fix button text color after change link -> button %>
  <%= image_button_tag t(:resend_confirmation), 'email-sync-outline',
    class: 'auxiliary', formaction: user_confirmation_path, formnovalidate: true,
    data: {validate: f.field_id(:email)} %>
--- a/app/views/users/unlocks/new.html.erb
+++ b/app/views/users/unlocks/new.html.erb
@@ -8,7 +8,7 @@
    <%= f.email_field :email, autofocus: true, autocomplete: "email" %>
  </div>

-  <div class="actions">
+  <div class="flex">
    <%= f.submit "Resend unlock instructions" %>
  </div>
 <% end %>
--- a/config/environments/test.rb
+++ b/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
--- a/config/locales/en.yml
+++ b/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
@@ -81,16 +86,26 @@ en:
      revert: Revert
      sign_out: Sign out
      source_code: Get code
+  readouts:
+    form:
+      set_default_unit: Set as default unit
  measurements:
    navigation: Measurements
    no_items: There are no measurements taken. You can Add some now.
    form:
-      select_quantity: select the measured quantities...
+      select_quantity: select quantities...
+      taken_at_html: Measurement taken at&emsp;
    index:
      new_measurement: Add measurement
-  readouts:
-    form:
-      select_unit: ...
+    readout:
+      destroy: Delete
+    create:
+      success:
+        one: Recorded 1 measurement.
+        other: Recorded %{count} measurements.
+      no_readouts: No readouts selected.
+    destroy:
+      success: Measurement deleted.
  quantities:
    navigation: Quantities
    no_items: There are no configured quantities. You can Add some or Import from defaults.
--- a/db/migrate/20250121230456_create_readouts.rb
+++ b/db/migrate/20250121230456_create_readouts.rb
@@ -1,10 +1,14 @@
 class CreateReadouts < ActiveRecord::Migration[7.2]
  def change
    create_table :readouts do |t|
-      t.references :user, null: false, foreign_key: true
+      # Reference :user through :quantity (:measurement may be NULL).
+      t.references :measurement, foreign_key: true
      t.references :quantity, null: false, foreign_key: true
+      # :category + :value + :unit as a separate table? (NumericValue, TextValue)
+      t.integer :category, null: false, default: 0
+      t.float :value, null: false, limit: Float::MANT_DIG
      t.references :unit, foreign_key: true
-      t.decimal :value, null: false, precision: 30, scale: 15
+      # Move to Measurement?
      #t.references :collector, foreign_key: true
      #t.references :device, foreign_key: true

--- a/db/migrate/20260402000000_add_taken_at_to_readouts.rb
+++ b/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
--- a/db/migrate/20260403000000_add_default_unit_to_quantities.rb
+++ b/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
--- a/db/schema.rb
+++ b/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"
--- a/test/system/quantities_test.rb
+++ b/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
--- a/test/system/users_test.rb
+++ b/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
Author	SHA1	Message	Date
barbie-bot	862430e586	Add index on readouts(user_id, taken_at) MeasurementsController#index orders by taken_at desc; without an index this scan grows linearly with the readout count. The composite index on (user_id, taken_at) covers both the implicit user_id filter from the association scope and the ORDER BY clause. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-04 10:20:55 +00:00
barbie-bot	3702e24153	Add taken_at to readouts and default unit to quantities Readouts gain a taken_at timestamp (distinct from created_at) that records when the measurement was actually taken. Measurements are now ordered by taken_at descending. Quantities gain an optional default_unit association. When set, the unit is pre-selected in the measurement form. A "Set as default" button on the unit selector lets users update the default directly from the form. - Migrations: add taken_at (datetime) to readouts, add default_unit_id (fk → units) to quantities - Readout: expose taken_at in ATTRIBUTES permit-list - Quantity: add default_unit belongs_to, expose in ATTRIBUTES - QuantitiesController: load @user_units for form actions - Quantities views: add Default unit column and select to form - Readouts form: pre-select default unit; add "Set as default" button (readoutUnitChanged / setDefaultUnit wired up in a later commit) - Measurements form: default taken_at input to current time - ApplicationHelper: propagate :form option to html_options in builder - config/environments/test.rb: allow Capybara's dynamic host - Tests: system tests for default-unit UI on the Quantities page Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>	2026-04-03 22:01:52 +00:00
cryptogopher	d893e59293	Clean up and improve items-table styling Closes #9	2026-03-25 18:42:24 +01:00
cryptogopher	33004f62bd	Improve Measurement form layout and styling	2026-03-22 01:06:38 +01:00
cryptogopher	687e6fcdff	Drop Readout.value decimal type in favor of float	2026-03-19 20:30:16 +01:00
cryptogopher	5ed066ad18	Unify border/outline parameters order	2026-03-06 01:42:32 +01:00
cryptogopher	dde4e52f1b	Fix form elements styling on hover	2026-03-06 01:33:23 +01:00
cryptogopher	a9091d76a8	Merge styles of <a>.button/<button>/<input type="submit"> into .button Remove flash button Fix some multi-selector specificity differences	2026-03-04 17:13:11 +01:00
cryptogopher	4175d31b9d	Update and format comments	2026-03-03 01:31:44 +01:00
cryptogopher	c659201904	Make [disabled] and [hidden] styles !important	2026-03-03 01:14:12 +01:00