bundle update

Remove unsupported attribute `[maxlength]` from `input[number]`.

.gitignore

@@ -15,6 +15,9 @@
 /config/master.key
 /config/puma.rb
 
+# Ignore test database.
+/db/test.sqlite3
+
 # Ignore all logfiles and tempfiles.
 /log/*
 /tmp/*
@@ -30,7 +33,7 @@
 
 /tmp/restart.txt
 
-# Ignore user files
+# Ignore user files.
 /.bash_history
 /.byebug_history
 /.config
@@ -38,6 +41,7 @@
 /.lesshst
 /.local
 /.mysql_history
+/.sqlite_history
 /.ssh
 /.vim
 /.viminfo

DESIGN.md

@@ -0,0 +1,76 @@
+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,
+        * if a decimal string with at most 15 significant digits is converted to
+          the IEEE 754 double-precision format, giving a normal number, and then
+          converted back to a decimal string with the same number of digits, the
+          final result should match the original string,
+        * if an IEEE 754 double-precision number is converted to a decimal
+          string with at least 17 significant digits, and then converted back to
+          double-precision representation, the final result must match the
+          original number,
+        * 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 majority of 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,
+    * at present, only normalized numbers are used and considered sufficient, in
+      order to avoid potential issues with the cross-platform compatibility of
+      subnormal (denormal) numbers,
+* in the future, the IEEE 754 decimal64 data type may be considered once it is
+  supported by database engines.
+
+### Database layer vs application layer data model constraints
+
+* database constraints are the final guard against data integrity corruption,
+    * they should safeguard against data referential integrity loss under _all_
+      data (not schema) manipulation scenarios, including application level
+      logic errors and direct data manipulation (e.g. through `dbconsole`),
+* application constraints can be as restrictive as database constraints or more,
+  but not less, as it doesn't serve any use case,
+    * proper application level constraints should prevent unhandled database
+      exception occurences, e.g `ActiveRecord::InvalidForeignKey` for operations
+      performed through Models (i.e. not `#delete_all` etc.)
+
+### User interface
+* values provided by user have to be exactly preserved, avoiding any precision
+  loss due to e.g. type casting
+    * when it's not possible to store value without information loss, feedback has to
+      be given at the time of entering value
+    * values can be received using either:
+        * `input[number]` - validates: number format, value against `[min]` and
+          `[max]` attributes; cannot validate precision (no `[pattern]` support);
+          or
+        * `input[text]` - can validate number format and precision with
+          `[pattern]`; cannot validate range (no `[min]`/`[max]` support),
+        * none of the above prevents misinterpretation of values between 0 and
+          Float::MIN as 0.0 - this has to be checked manually,
+        * assuming that user input with _precision > DIG_ is as rare as in
+          the range _(0, MIN)_, the decision is to choose input which requires
+          the least/simplest additional code.

Gemfile

@@ -1,14 +1,14 @@
 source "https://rubygems.org"
 
-# The requirement for the Ruby version comes from Rails
+# The requirement for the Ruby version comes from Rails.
-gem "rails", "~> 7.2.3"
+gem "rails", "~> 8.1.4"
 gem "sprockets-rails"
 gem "puma", "~> 6.0"
 gem "sassc-rails"
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem "tzinfo-data", platforms: %i[ mingw mswin x64_mingw jruby ]
 
-# TODO: select db gems automatically
+# TODO: select db gems automatically?
 #   database_config = ERB.new(File.read("config/database.yml")).result
 #   YAML.load(database_config, aliases: true).values.map { |env| env["adapter"] }.uniq
 group :mysql, optional: true do
@@ -21,7 +21,7 @@ group :sqlite, optional: true do
   gem "sqlite3", "~> 2.7"
 end
 
-gem "devise"
+gem "devise", "~> 5.0.4"
 
 gem "importmap-rails"
 gem "turbo-rails", "~> 2.0"
@@ -42,11 +42,8 @@ group :test do
   # Use system testing [https://guides.rubyonrails.org/testing.html#system-testing]
   gem "capybara"
   gem "selenium-webdriver"
-
-  # Remove minitest version restriction after error fixed:
-  #   railties-7.2.3/lib/rails/test_unit/line_filtering.rb:7:in `run':
-  #     wrong number of arguments (given 3, expected 1..2) (ArgumentError)
-  #   from /var/www/.gem/ruby/3.3.0/gems/minitest-6.0.2/lib/minitest.rb:473:in
-  #     `block (2 levels) in run_suite'
-  gem "minitest", "< 6"
 end
+
+# TODO: remove after upgrade to next version containing PR:
+#   https://github.com/ruby-i18n/i18n/pull/755
+gem "i18n", git: "https://github.com/ruby-i18n/i18n", branch: "delegate-missing-interpolation-handler"

Gemfile.lock

@@ -1,85 +1,93 @@
+GIT
+  remote: https://github.com/ruby-i18n/i18n
+  revision: 8850d979a3a32453123ed744b943ead8751ba73b
+  branch: delegate-missing-interpolation-handler
+  specs:
+    i18n (1.15.2)
+      concurrent-ruby (~> 1.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.2.3)
+    action_text-trix (2.1.19)
-      actionpack (= 7.2.3)
+      railties
-      activesupport (= 7.2.3)
+    actioncable (8.1.4)
+      actionpack (= 8.1.4)
+      activesupport (= 8.1.4)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
       zeitwerk (~> 2.6)
-    actionmailbox (7.2.3)
+    actionmailbox (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activerecord (= 7.2.3)
+      activerecord (= 8.1.4)
-      activestorage (= 7.2.3)
+      activestorage (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       mail (>= 2.8.0)
-    actionmailer (7.2.3)
+    actionmailer (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      actionview (= 7.2.3)
+      actionview (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       mail (>= 2.8.0)
       rails-dom-testing (~> 2.2)
-    actionpack (7.2.3)
+    actionpack (8.1.4)
-      actionview (= 7.2.3)
+      actionview (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
-      cgi
       nokogiri (>= 1.8.5)
-      racc
+      rack (>= 2.2.4)
-      rack (>= 2.2.4, < 3.3)
       rack-session (>= 1.0.1)
       rack-test (>= 0.6.3)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
       useragent (~> 0.16)
-    actiontext (7.2.3)
+    actiontext (8.1.4)
-      actionpack (= 7.2.3)
+      action_text-trix (~> 2.1.15)
-      activerecord (= 7.2.3)
+      actionpack (= 8.1.4)
-      activestorage (= 7.2.3)
+      activerecord (= 8.1.4)
-      activesupport (= 7.2.3)
+      activestorage (= 8.1.4)
+      activesupport (= 8.1.4)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.2.3)
+    actionview (8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       builder (~> 3.1)
-      cgi
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    activejob (7.2.3)
+    activejob (8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       globalid (>= 0.3.6)
-    activemodel (7.2.3)
+    activemodel (8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
-    activerecord (7.2.3)
+    activerecord (8.1.4)
-      activemodel (= 7.2.3)
+      activemodel (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       timeout (>= 0.4.0)
-    activestorage (7.2.3)
+    activestorage (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activerecord (= 7.2.3)
+      activerecord (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       marcel (~> 1.0)
-    activesupport (7.2.3)
+    activesupport (8.1.4)
       base64
-      benchmark (>= 0.3)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
+      json
       logger (>= 1.4.2)
       minitest (>= 5.1)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
-    addressable (2.8.8)
+      uri (>= 0.13.1)
+    addressable (2.9.0)
       public_suffix (>= 2.0.2, < 8.0)
     base64 (0.3.0)
-    bcrypt (3.1.21)
+    bcrypt (3.1.22)
-    benchmark (0.5.0)
+    bigdecimal (4.1.3)
-    bigdecimal (4.0.1)
     bindex (0.8.1)
     builder (3.3.0)
     byebug (13.0.0)
@@ -93,155 +101,155 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
-    cgi (0.5.1)
+    concurrent-ruby (1.3.8)
-    concurrent-ruby (1.3.6)
     connection_pool (3.0.2)
-    crass (1.0.6)
+    crass (1.0.7)
     date (3.5.1)
-    devise (5.0.2)
+    devise (5.0.4)
       bcrypt (~> 3.0)
       orm_adapter (~> 0.1)
       railties (>= 7.0)
       responders
       warden (~> 1.2.3)
     drb (2.2.3)
-    erb (6.0.2)
+    erb (6.0.7)
     erubi (1.13.1)
-    ffi (1.17.3-aarch64-linux-gnu)
+    ffi (1.17.4-aarch64-linux-gnu)
-    ffi (1.17.3-aarch64-linux-musl)
+    ffi (1.17.4-aarch64-linux-musl)
-    ffi (1.17.3-arm-linux-gnu)
+    ffi (1.17.4-arm-linux-gnu)
-    ffi (1.17.3-arm-linux-musl)
+    ffi (1.17.4-arm-linux-musl)
-    ffi (1.17.3-arm64-darwin)
+    ffi (1.17.4-arm64-darwin)
-    ffi (1.17.3-x86_64-darwin)
+    ffi (1.17.4-x86_64-darwin)
-    ffi (1.17.3-x86_64-linux-gnu)
+    ffi (1.17.4-x86_64-linux-gnu)
-    ffi (1.17.3-x86_64-linux-musl)
+    ffi (1.17.4-x86_64-linux-musl)
-    globalid (1.3.0)
+    globalid (1.4.0)
       activesupport (>= 6.1)
-    i18n (1.14.8)
-      concurrent-ruby (~> 1.0)
     importmap-rails (2.2.3)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
       railties (>= 6.0.0)
-    io-console (0.8.2)
+    io-console (0.9.4)
-    irb (1.17.0)
+    irb (1.18.0)
       pp (>= 0.6.0)
       prism (>= 1.3.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
+    json (3.0.2)
     logger (1.7.0)
-    loofah (2.25.0)
+    loofah (2.25.2)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
-    mail (2.9.0)
+    mail (2.9.1)
       logger
       mini_mime (>= 0.1.1)
       net-imap
       net-pop
       net-smtp
-    marcel (1.1.0)
+    marcel (1.2.1)
     matrix (0.4.3)
     mini_mime (1.1.5)
-    minitest (5.27.0)
+    minitest (6.0.6)
+      drb (~> 2.0)
+      prism (~> 1.5)
     mysql2 (0.5.7)
       bigdecimal
-    net-imap (0.6.3)
+    net-imap (0.6.7)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
-    net-protocol (0.2.2)
+    net-protocol (0.4.0)
       timeout
-    net-smtp (0.5.1)
+    net-smtp (0.5.2)
       net-protocol
     nio4r (2.7.5)
-    nokogiri (1.19.1-aarch64-linux-gnu)
+    nokogiri (1.19.4-aarch64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.1-aarch64-linux-musl)
+    nokogiri (1.19.4-aarch64-linux-musl)
       racc (~> 1.4)
-    nokogiri (1.19.1-arm-linux-gnu)
+    nokogiri (1.19.4-arm-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.1-arm-linux-musl)
+    nokogiri (1.19.4-arm-linux-musl)
       racc (~> 1.4)
-    nokogiri (1.19.1-arm64-darwin)
+    nokogiri (1.19.4-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.19.1-x86_64-darwin)
+    nokogiri (1.19.4-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.19.1-x86_64-linux-gnu)
+    nokogiri (1.19.4-x86_64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.19.1-x86_64-linux-musl)
+    nokogiri (1.19.4-x86_64-linux-musl)
       racc (~> 1.4)
     orm_adapter (0.5.0)
-    pg (1.6.3)
+    pg (1.7.0)
-    pg (1.6.3-aarch64-linux)
+    pg (1.7.0-aarch64-linux)
-    pg (1.6.3-aarch64-linux-musl)
+    pg (1.7.0-aarch64-linux-musl)
-    pg (1.6.3-arm64-darwin)
+    pg (1.7.0-arm64-darwin)
-    pg (1.6.3-x86_64-darwin)
+    pg (1.7.0-x86_64-darwin)
-    pg (1.6.3-x86_64-linux)
+    pg (1.7.0-x86_64-linux)
-    pg (1.6.3-x86_64-linux-musl)
+    pg (1.7.0-x86_64-linux-musl)
-    pp (0.6.3)
+    pp (0.6.4)
       prettyprint
     prettyprint (0.2.0)
     prism (1.9.0)
-    psych (5.3.1)
+    public_suffix (7.0.5)
-      date
-      stringio
-    public_suffix (7.0.2)
     puma (6.6.1)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.2.5)
+    rack (3.2.7)
-    rack-session (2.1.1)
+    rack-session (2.1.2)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.2.0)
       rack (>= 1.3)
     rackup (2.3.1)
       rack (>= 3)
-    rails (7.2.3)
+    rails (8.1.4)
-      actioncable (= 7.2.3)
+      actioncable (= 8.1.4)
-      actionmailbox (= 7.2.3)
+      actionmailbox (= 8.1.4)
-      actionmailer (= 7.2.3)
+      actionmailer (= 8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      actiontext (= 7.2.3)
+      actiontext (= 8.1.4)
-      actionview (= 7.2.3)
+      actionview (= 8.1.4)
-      activejob (= 7.2.3)
+      activejob (= 8.1.4)
-      activemodel (= 7.2.3)
+      activemodel (= 8.1.4)
-      activerecord (= 7.2.3)
+      activerecord (= 8.1.4)
-      activestorage (= 7.2.3)
+      activestorage (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
       bundler (>= 1.15.0)
-      railties (= 7.2.3)
+      railties (= 8.1.4)
     rails-dom-testing (2.3.0)
       activesupport (>= 5.0.0)
       minitest
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.7.0)
+    rails-html-sanitizer (1.7.1)
-      loofah (~> 2.25)
+      loofah (~> 2.25, >= 2.25.2)
       nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
-    railties (7.2.3)
+    railties (8.1.4)
-      actionpack (= 7.2.3)
+      actionpack (= 8.1.4)
-      activesupport (= 7.2.3)
+      activesupport (= 8.1.4)
-      cgi
       irb (~> 1.13)
       rackup (>= 1.0.0)
       rake (>= 12.2)
       thor (~> 1.0, >= 1.2.2)
       tsort (>= 0.2)
       zeitwerk (~> 2.6)
-    rake (13.3.1)
+    rake (13.4.2)
-    rdoc (7.2.0)
+    rbs (4.2.0)
-      erb
+      logger
-      psych (>= 4.0.0)
+      prism (>= 1.6.0)
       tsort
-    regexp_parser (2.11.3)
+    rdoc (8.1.0)
-    reline (0.6.3)
+      erb
+      prism (>= 1.6.0)
+      rbs (>= 4.0.0)
+      tsort
+    regexp_parser (2.13.1)
+    reline (0.7.0)
       io-console (~> 0.5)
-    responders (3.2.0)
+    responders (3.2.1)
       actionpack (>= 7.0)
       railties (>= 7.0)
-    rexml (3.4.4)
+    rubyzip (3.7.0)
-    rubyzip (3.2.2)
     sassc (2.4.0)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
@@ -251,54 +259,52 @@ GEM
       sprockets-rails
       tilt
     securerandom (0.4.1)
-    selenium-webdriver (4.41.0)
+    selenium-webdriver (4.50.0)
       base64 (~> 0.2)
       logger (~> 1.4)
-      rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 4.0)
       websocket (~> 1.0)
-    sprockets (4.2.2)
+    sprockets (4.4.1)
-      concurrent-ruby (~> 1.0)
+      concurrent-ruby (~> 1.1)
       logger
       rack (>= 2.2.4, < 4)
     sprockets-rails (3.5.2)
       actionpack (>= 6.1)
       activesupport (>= 6.1)
       sprockets (>= 3.0.0)
-    sqlite3 (2.9.0-aarch64-linux-gnu)
+    sqlite3 (2.9.6-aarch64-linux-gnu)
-    sqlite3 (2.9.0-aarch64-linux-musl)
+    sqlite3 (2.9.6-aarch64-linux-musl)
-    sqlite3 (2.9.0-arm-linux-gnu)
+    sqlite3 (2.9.6-arm-linux-gnu)
-    sqlite3 (2.9.0-arm-linux-musl)
+    sqlite3 (2.9.6-arm-linux-musl)
-    sqlite3 (2.9.0-arm64-darwin)
+    sqlite3 (2.9.6-arm64-darwin)
-    sqlite3 (2.9.0-x86_64-darwin)
+    sqlite3 (2.9.6-x86_64-darwin)
-    sqlite3 (2.9.0-x86_64-linux-gnu)
+    sqlite3 (2.9.6-x86_64-linux-gnu)
-    sqlite3 (2.9.0-x86_64-linux-musl)
+    sqlite3 (2.9.6-x86_64-linux-musl)
-    stringio (3.2.0)
     thor (1.5.0)
-    tilt (2.7.0)
+    tilt (2.9.0)
-    timeout (0.6.0)
+    timeout (0.6.1)
     tsort (0.2.0)
     turbo-rails (2.0.23)
       actionpack (>= 7.1.0)
       railties (>= 7.1.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    uri (1.1.1)
     useragent (0.16.11)
     warden (1.2.9)
       rack (>= 2.0.9)
-    web-console (4.2.1)
+    web-console (4.3.0)
-      actionview (>= 6.0.0)
+      actionview (>= 8.0.0)
-      activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
-      railties (>= 6.0.0)
+      railties (>= 8.0.0)
     websocket (1.2.11)
-    websocket-driver (0.8.0)
+    websocket-driver (0.8.2)
       base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    zeitwerk (2.7.5)
+    zeitwerk (2.8.3)
 
 PLATFORMS
   aarch64-linux-gnu
@@ -313,13 +319,13 @@ PLATFORMS
 DEPENDENCIES
   byebug
   capybara
-  devise
+  devise (~> 5.0.4)
+  i18n!
   importmap-rails
-  minitest (< 6)
   mysql2 (~> 0.5)
   pg (~> 1.5)
   puma (~> 6.0)
-  rails (~> 7.2.3)
+  rails (~> 8.1.4)
   sassc-rails
   selenium-webdriver
   sprockets-rails

README.md

@@ -16,14 +16,10 @@ environment, see the _Contributing_ section below.
 * Server side:
     * Ruby interpreter, depending on the version of Rails used (see _Gemfile_),
         * https://guides.rubyonrails.org/upgrading_ruby_on_rails.html#ruby-versions
-    * database (e.g. MySQL >= 8.0) supporting:
+    * database (e.g. SQLite, MySQL >= 8.0) supporting:
         * recursive Common Table Expressions (CTE) for SELECT/UPDATE/DELETE,
             * MariaDB does not support CTE for UPDATE/DELETE
               (https://jira.mariadb.org/browse/MDEV-18511)
-        * decimal datatype with precision of at least 30,
-            * SQLite3 _flexible typing_ decimal will work, but precision
-              will be limited to 16, making it practical mostly for testing
-              purposes
     * for testing: browser as specified in _Client side_ requirements
 * Client side:
     * browser (e.g. Firefox >= 121) supporting:
@@ -89,14 +85,10 @@ Running
 
 ### Standalone Rails server + Apache proxy
 
-Customize Puma config template:
+Copy and customize Puma config template if required:
 
     cp -a config/puma.rb.dist config/puma.rb
 
-and specify server IP/port, either with `port` or `bind`, e.g.:
-
-    bind 'tcp://0.0.0.0:3000'
-
 #### (option 1) Start server manually
 
     bundle exec rails s -e production
@@ -123,9 +115,26 @@ Contributing
 
 ### Gems
 
-Apart from database adapter, install development and testing gems:
+Install development and testing gems, including at least MySQL and SQLite
+database adapters:
 
-    bundle config --local with mysql development test
+    bundle config --local with development test mysql sqlite
+
+#### Using gems from local git repos
+
+When working on gem PRs, it may be useful to work with proposed changes locally
+until PRs get accepted upstream. To add gem hosted in local git repository:
+
+    bundle config set local.capybara /var/www/tmp/capybara
+
+Add gem to `Gemfile`:
+
+  gem "capybara", git: "https://github.com/teamcapybara/capybara", branch: "branch-name"
+
+and install:
+
+    bundle install
+    bundle show capybara
 
 ### Configuration
 
@@ -138,20 +147,29 @@ assets.
 
 ### Database
 
-Grant database user privileges for development and test environments,
+Grant database user privileges for development and test environments. Example
-possibly with different Ruby versions:
+below shows how to grant privileges to all databases which names start with
+`fixinme-` on MySQL:
 
     > mysql -p
     mysql> create user `fixinme-dev`@localhost identified by '<some password>';
     mysql> grant all privileges on `fixinme-%`.* to `fixinme-dev`@localhost;
     mysql> flush privileges;
 
+Dumping development data before database reset:
+
+    mysqldump -h <address> -u <user> -p --no-create-info --no-tablespaces --complete-insert <database> > tmp/data.sql
+
 ### Development environment
 
 Starting application server in development environment:
 
     bundle exec rails s -e development
 
+Accessing database console when more than one test db is present:
+
+    bundle exec rails dbconsole -e test --db sqlite3
+
 For running rake tasks, prepend command with environment:
 
     RAILS_ENV=development bundle exec rails ...
@@ -164,14 +182,22 @@ Tests need to be run from within toplevel application directory:
 
         bundle exec rails test:system
 
-* system test(s) with seed/test name specified:
+* system test(s) with seed or test name specified:
 
-        bundle exec rails test:system --seed 64690 --name test_add_unit
+        bundle exec rails test:system --include test_add_unit --seed 64690
 
-* all tests from one file, with optional seed:
+* all tests from one file, optionally with seed:
 
         bundle exec rails test test/system/users_test.rb --seed 1234
 
+* system tests for selected database configuration (if multiple present):
+
+        bundle exec rails test:system --include /^test_sqlite3_/
+
+* single system test for all database configurations (if multiple present):
+
+        bundle exec rails test:system --include /^test_\\w+_add_unit$/
+
 ### Icons
 
 Pictogrammers Material Design Icons: https://pictogrammers.com/library/mdi/

app/assets/images/alert-outline.svg

@@ -0,0 +1 @@
+<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>

app/assets/images/check-circle-outline.svg

@@ -0,0 +1 @@
+<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>

app/assets/images/pictograms/alert-outline.svg

@@ -1 +0,0 @@
-<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>

app/assets/images/pictograms/check-circle-outline.svg

@@ -1 +0,0 @@
-<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>

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,
+ * NOTE: style in a modular way, similar to how CSS @scope would be used,
- * to make transition easier once @scope is widely available */
+ * to make transition easier once @scope is widely available. */
 :root {
   --color-focus-gray: #f3f3f3;
   --color-border-gray: #dddddd;
@@ -53,17 +55,41 @@
 :focus-visible {
   outline: none;
 }
+/* NOTE: move to higher priority layer instead of using !important?; add CSS
+ * @layer requirements in README */
+/* Disable elements with:
+ *  `[aria-disabled=true]` - non-form elements (e.g. links),
+ *  `[disabled]` - form controls, that may be enabled conditionally,
+ *  `[readonly]` - form controls, that stay disabled for form lifetime. */
+[aria-disabled=true],
+[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
+ *  blue - target for interaction with pointer,
- *  gray - target for interaction with keyboard
+ *  gray - target for interaction with keyboard,
- *  red - destructive, non-undoable action
+ *  red - destructive, non-undoable action.
  */
+/* TODO: merge selectors using :is() */
+a,
 button,
 details,
 input,
 select,
+summary,
 textarea {
   background-color: inherit;
   font: inherit;
@@ -73,56 +99,24 @@ 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],
+svg {
-.auxiliary {
+  height: 1.4em;
-  border-color: var(--color-border-gray);
+  margin: 0 0.2em 0 0;
-  color: var(--color-nav-gray);
+  width: 1.4em;
-  fill: var(--color-nav-gray);
+}
+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 +124,20 @@ 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 */
+/* Hide spin buttons of <input type=number>. */
-/* TODO: add spin buttons inside input[number]: before (-) and after (+) input */
+/* 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 +146,117 @@ input::-webkit-outer-spin-button {
   -webkit-appearance: none;
   margin: 0;
 }
-.button > svg,
+/* Text color of table form controls:
-.tab > svg,
+ *  - black for row/table forms,
-button > svg {
+ *  - inherited for internal (column specific) buttons/forms. */
-  height: 1.4em;
+table input,
-  width: 1.4em;
+table select,
+table summary,
+table textarea {
+  border-color: var(--color-border-gray);
 }
-.button > svg:not(:last-child),
+table input,
-.tab > svg:not(:last-child),
+table select,
-button > svg:not(:last-child) {
+table textarea {
-  margin-right: 0.2em;
+  padding-block: 0.375em;
 }
-/* TODO: move normal non-button links (<a>:hover/:focus) styling here (i.e.
+table form input,
- * page-wide, top-level) and remove from table.items - as the style should be
+table form select,
- * same everywhere */
+table form summary,
-.button:focus-visible,
+table form textarea {
-button:focus-visible,
+  color: inherit;
-input[type=submit]:focus-visible {
+}
-  background-color: var(--color-focus-gray);
+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,
+input:hover,
-button:hover,
+select:hover,
-input[type=submit]: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);
+}
+pre {
+  display: inline;
+  font: inherit;
+}
+
+/* `.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;
+}
+.auxiliary {
+  border-color: var(--color-nav-gray);
+  color: var(--color-nav-gray);
+  fill: var(--color-nav-gray);
+}
+table .button {
+  border-color: var(--color-border-gray);
+  font-weight: normal;
+  height: 100%;
+  padding: 0.4em;
+}
+.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 +266,17 @@ input[type=submit]:hover {
   background-color: var(--color-red);
   border-color: var(--color-red);
 }
-input:hover,
+.link:focus-visible {
-select:hover,
+  text-decoration-color: var(--color-gray);
-summary:hover,
-textarea:hover {
-  border-color: var(--color-blue);
-  outline: solid 1px var(--color-blue);
 }
-select:hover,
+.link:hover {
-summary:hover {
+  color: var(--color-blue);
-  cursor: pointer;
+  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;
 }
 
 
-/* NOTE: collapse gaps around empty rows (`topside`) once possible
+/* NOTE: collapse gaps around empty rows (`topside`) once possible with
- * with grid-collapse property and remove alternative grid-template
+ * `grid-collapse` property and remove alternative `grid-template-areas`.
  * https://github.com/w3c/csswg-drafts/issues/5813 */
 body {
   display: grid;
@@ -222,16 +284,16 @@ 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 +309,14 @@ 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 +348,7 @@ 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 +364,42 @@ header {
   display: grid;
   grid-column: 2/5;
   grid-template-columns: subgrid;
+  line-height: 2.2em;
   pointer-events: auto;
 }
-.flash.alert:before {
+.flash::before {
-  content: url('pictograms/alert-outline.svg');
+  filter: invert(1);
   height: 1.4em;
   margin: 0 0.5em;
   width: 1.4em;
 }
+.flash.alert::before {
+  content: url('alert-outline.svg');
+}
 .flash.alert {
   border-color: var(--color-red);
   background-color: var(--color-red);
 }
-.flash.notice:before {
+.flash.notice::before {
-  content: url('pictograms/check-circle-outline.svg');
+  content: url('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 {
+.flash svg {
-  grid-column: 2;
-}
-/* NOTE: currently flash button inherits some unnecessary styles from generic
- * button. */
-.flash > button {
-  border: none;
-  color: inherit;
   cursor: pointer;
-  font-size: 1.4em;
+  fill: white;
-  font-weight: bold;
+  height: 2.2em;
-  grid-column: 3;
   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 +416,7 @@ 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 +436,120 @@ 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 {
-/* TODO: remove .items class (?) and make 'form table' work properly */
+  border: none;
-table.items {
   border-spacing: 0;
-  border: solid 1px var(--color-border-gray);
+}
+.tabular-form table td {
+  border: none;
+  padding-inline-start: 0.4em;
+  vertical-align: middle;
+}
+.tabular-form table td:first-child {
+  padding-inline-start: 0;
+}
+.tabular-form table td:last-child {
+  padding-inline-end: 0;
+}
+.tabular-form table :is(form, input, select, textarea):only-child {
+  margin-inline-start: 0;
+}
+
+
+.items-table {
+  border-spacing: 0;
+  border: 1px solid var(--color-border-gray);
   border-radius: 0.25em;
   font-size: 0.85rem;
   text-align: left;
 }
-table:not(:has(tr)) {
+.items-table thead {
-  display: none;
-}
-table.items thead {
   font-size: 0.8rem;
 }
-table.items thead,
+.items-table thead,
-table.items tbody tr:hover {
+.items-table tbody tr:hover {
   background-color: var(--color-focus-gray);
 }
-table.items th {
+.items-table th {
-  padding-block: 0.75em;
+  padding: 0.75em 0 0.75em 1em;
   text-align: center;
 }
-table.items th,
+.items-table th:last-child {
-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 {
   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 {
+.items-table :is(form, input, select, textarea):only-child {
-  border-top: solid 1px var(--color-border-gray);
+  margin-inline-start: calc(-0.4em - 0.9px);
-  height: 2.4em;
-  padding-block: 0.1em;
 }
-table.items .actions {
+/* For <a> to fill table cell completely, we use an `::after` pseudoelement. */
-  display: flex;
+/* 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 {
+.items-table .dropzone {
-  justify-content: center;
-}
-table.items tr.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 {
+.items-table .handle {
-  cursor: move;
+  cursor: grab;
 }
-table.items tr.form td {
+.items-table .form td {
   vertical-align: top;
 }
-
+.items-table td:not(:first-child),
-/* 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),
 .grayed {
   color: var(--color-table-gray);
-  fill: var(--color-table-gray);
+  fill: var(--color-gray);
 }
-table.items svg {
+.items-table td:has(> svg:only-child) {
-  height: 1rem;
-  vertical-align: middle;
-  width: 1rem;
-}
-table.items svg:last-child {
-  height: 1.2rem;
-  width: 1.2rem;
-}
-table.items td.svg {
   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 {
+.flex.vertical {
-  justify-content: center;
+  flex-direction: column;
 }
 .hint {
   color: var(--color-table-gray);
@@ -586,21 +557,18 @@ form table.items td:first-child {
   font-size: 0.9rem;
   text-align: center;
 }
-.vflex {
+.hmin50 {
-  display: flex;
+  min-width: 50%;
-  gap: 0.8em;
-  flex-direction: column;
 }
-[disabled] {
+.italic {
-/* label:has(input[disabled]) {
+  color: var(--color-gray);
- * TODO: disabled checkbox blue square focus removal; disabled label styling;
+  font-style: italic;
- * focused label styling (currently only checkbox has focus)
+}
- * */
+.ralign {
-  border-color: var(--color-border-gray) !important;
+  text-align: right;
-  color: var(--color-border-gray) !important;
+}
-  cursor: not-allowed;
+.rextend {
-  fill: var(--color-border-gray) !important;
+  margin-right: auto;
-  pointer-events: none;
 }
 
 
@@ -612,15 +580,15 @@ 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');
+  mask-image: url('chevron-down.svg');
   mask-size: cover;
   width: 1em;
 }
@@ -629,7 +597,7 @@ 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 +608,15 @@ 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;
+  background-color: white;
-  border: solid 1px var(--color-border-gray);
+  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 +638,15 @@ 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;
+}

app/controllers/application_controller.rb

@@ -55,9 +55,9 @@ class ApplicationController < ActionController::Base
 
   private
 
-  def render_no_content(record)
+  def render_errors(record)
-    helpers.render_errors(record)
+    target = record.new_record? ? [:new, record.parent || record.class] : [:edit, record]
-    render html: nil, layout: true
+    render 'errors', assigns: {record: record, target: target}
   end
 
   def rescue_turbo(exception)

app/controllers/default/units_controller.rb

@@ -17,7 +17,7 @@ class Default::UnitsController < ApplicationController
 
   def import
     @unit.port!(current_user)
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   ensure
     run_and_render :index
   end
@@ -30,14 +30,14 @@ class Default::UnitsController < ApplicationController
 
   def export
     @unit.port!(nil)
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   ensure
     run_and_render :index
   end
 
   def destroy
     @unit.destroy!
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   ensure
     run_and_render :index
   end

app/controllers/quantities_controller.rb

@@ -21,7 +21,7 @@ class QuantitiesController < ApplicationController
     if @quantity.save
       @before = @quantity.successive
       @ancestors = @quantity.ancestors
-      flash.now[:notice] = t('.success', quantity: @quantity)
+      flash.now.notice = t('.success', quantity: @quantity)
     else
       render :new
     end
@@ -33,7 +33,7 @@ class QuantitiesController < ApplicationController
   def update
     if @quantity.update(quantity_params.except(:parent_id))
       @ancestors = @quantity.ancestors
-      flash.now[:notice] = t('.success', quantity: @quantity)
+      flash.now.notice = t('.success', quantity: @quantity)
     else
       render :edit
     end
@@ -43,18 +43,21 @@ class QuantitiesController < ApplicationController
     permitted = params.require(:quantity).permit(:parent_id)
     @previous_ancestors = @quantity.ancestors
 
-    # Until UI blocks all disallowed reparents, render error messages if present
+    if @quantity.update(permitted)
-    render_no_content(@quantity) unless @quantity.update(permitted)
+      @ancestors = @quantity.ancestors
-
+      @self_and_progenies = @quantity.with_progenies
-    @ancestors = @quantity.ancestors
+      @before = @self_and_progenies.last.successive
-    @self_and_progenies = @quantity.with_progenies
+    else
-    @before = @self_and_progenies.last.successive
+      # Until UI blocks all disallowed reparents, render error messages if present.
+      flash.now.alert = @quantity.errors.full_messages
+      render :nothing
+    end
   end
 
   def destroy
     @quantity.destroy!
     @ancestors = @quantity.ancestors
-    flash.now[:notice] = t('.success', quantity: @quantity)
+    flash.now.notice = t('.success', quantity: @quantity)
   end
 
   private

app/controllers/readouts_controller.rb

@@ -6,7 +6,7 @@ class ReadoutsController < ApplicationController
   def new
     @quantities -= @prev_quantities
     # TODO: raise ParameterInvalid if new_quantities.empty?
-    @readouts = current_user.readouts.build(@quantities.map { |q| {quantity: q} })
+    @readouts = @quantities.map { |q| q.readouts.build }
 
     @user_units = current_user.units.ordered
 

app/controllers/units_controller.rb

@@ -1,10 +1,9 @@
 class UnitsController < ApplicationController
-  before_action only: :new do
+  before_action ->{ @unit = current_user.units.find_by!(id: params[:id]) },
-    find_unit if params[:id].present?
+    only: [:new, :edit, :update, :rebase, :destroy],
-  end
+    unless: ->{ action_name == "new" && params[:id].nil? }
-  before_action :find_unit, only: [:edit, :update, :rebase, :destroy]
 
-  before_action except: :index do
+  before_action except: [:index] do
     raise AccessForbidden unless current_user.at_least(:active)
   end
 
@@ -17,12 +16,12 @@ class UnitsController < ApplicationController
   end
 
   def create
-    @unit = current_user.units.new(unit_params)
+    @unit = current_user.units.new(params.expect(Unit::ATTRIBUTES))
     if @unit.save
       @before = @unit.successive
-      flash.now[:notice] = t('.success', unit: @unit)
+      flash.now.notice = t('.success', unit: @unit)
     else
-      render :new
+      render_errors @unit
     end
   end
 
@@ -30,40 +29,32 @@ class UnitsController < ApplicationController
   end
 
   def update
-    if @unit.update(unit_params.except(:base_id))
+    if @unit.update(params.except(:base_id).expect(Unit::ATTRIBUTES))
-      flash.now[:notice] = t('.success', unit: @unit)
+      flash.now.notice = t('.success', unit: @unit)
     else
-      render :edit
+      render_errors @unit
     end
   end
 
   # TODO: Avoid double table width change by first un-hiding table header,
   # then displaying index, e.g. by re-displaying header in index
   def rebase
-    permitted = params.require(:unit).permit(:base_id)
+    unit_params = params.expect(unit: :base_id)
-    permitted.merge!(multiplier: 1) if permitted[:base_id].blank? && @unit.multiplier != 1
+    unit_params.merge!(multiplier: 1.0) if unit_params[:base_id].blank?
 
     @previous_base = @unit.base
-    @unit.update!(permitted)
+    @unit.update!(unit_params)
 
     @before = @unit.successive
     if @unit.multiplier_previously_changed?
-      flash.now[:notice] = t(".multiplier_reset", unit: @unit)
+      flash.now.notice = t(".multiplier_reset", unit: @unit)
     end
   end
 
   def destroy
     @unit.destroy!
-    flash.now[:notice] = t('.success', unit: @unit)
+    flash.now.notice = t('.success', unit: @unit)
   end
 
   private
-
-  def unit_params
-    params.require(:unit).permit(Unit::ATTRIBUTES)
-  end
-
-  def find_unit
-    @unit = current_user.units.find_by!(id: params[:id])
-  end
 end

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)
@@ -34,7 +40,7 @@ module ApplicationHelper
       #   controller.action.* => helpers.label.model.* => activerecord.attributes.model.*
       # First 2 levels are translated recursively.
       label(method, class: classes) do |builder|
-        translation = I18n.config.with(**handler) { deep_translate(method, **options) }
+        translation = I18n.with(**handler) { deep_translate(method, **options) }
         translation.presence || "#{builder.translation}:"
       end
     end
@@ -85,31 +91,32 @@ module ApplicationHelper
     [:text_field, :password_field, :text_area].each do |selector|
       class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
         def #{selector}(method, options = {})
-          options[:maxlength] ||= object.class.type_for_attribute(method).limit
+          options[:maxlength] ||= object.type_for_attribute(method).limit
-          if object.errors.include?(method)
-            options[:pattern] = except_pattern(object.public_send(method), options[:pattern])
-          end
           super
         end
       RUBY_EVAL
     end
 
     def number_field(method, options = {})
-      attr_type = object.type_for_attribute(method)
+      case object.type_for_attribute(method).type
-      if attr_type.type == :decimal
+      when :float, :double
-        options[:value] = object.public_send(method)&.to_scientific
+        options[:min] ||= Float::MIN_15.to_scientific
-        options[:step] ||= BigDecimal(10).power(-attr_type.scale)
+        options[:max] ||= Float::MAX_15.to_scientific
-        options[:max] ||= BigDecimal(10).power(attr_type.precision - attr_type.scale) -
+        options[:oninput] = 'numberValidate(event)'
-          options[:step]
+        options[:size] ||= 6
-        options[:min] = options[:min] == :step ? options[:step] : options[:min]
+        options[:step] ||= :any
-        options[:min] ||= -options[:max]
+        options[:value] = object.public_send("#{method}_before_type_cast")
       end
       super
     end
 
     def button(value = nil, options = {}, &block)
-      # button does not use #objectify_options
+      # #button does not use #objectify_options/@default_options
-      options.merge!(@options.slice(:form))
+      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
 
@@ -117,11 +124,7 @@ module ApplicationHelper
 
     def submit_default_value
       svg_name = object ? (object.persisted? ? 'update' : 'plus-circle-outline') : ''
-      @template.svg_tag("pictograms/#{svg_name}", super)
+      @template.svg_tag(svg_name, super)
-    end
-
-    def except_pattern(value, pattern = nil)
-      "(?!^#{Regexp.escape(value)}$)" + (pattern || ".*")
     end
   end
 
@@ -132,19 +135,19 @@ module ApplicationHelper
     record_object, options = nil, record_object if record_object.is_a?(Hash)
     extra_options = {builder: TabularFormBuilder, skip_default_ids: true}
     options = merge_attributes(options, extra_options)
-    # TODO: set error message with setCustomValidity instead of rendering to flash?
-    render_errors(record_object || record_name)
     fields_for(record_name, record_object, **options, &block)
   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
-      tag.use(href: "#{image_path(source + ".svg")}#icon")
+    svg_tag = tag.svg(**options) do
+      tag.use(href: image_path("#{source}.svg") + '#icon')
     end
     label.blank? ? svg_tag : svg_tag + tag.span(label)
   end
@@ -160,7 +163,7 @@ module ApplicationHelper
 
     menu_tabs.map do |name, image, status, css_class|
       if current_user.at_least(status)
-        link_to svg_tag("pictograms/#{image}", t("#{name}.navigation")),
+        link_to svg_tag(image, t("#{name}.navigation")),
           {controller: "/#{name}", action: "index"},
           class: class_names('tab', css_class, active: name == current_tab)
       end
@@ -192,29 +195,19 @@ module ApplicationHelper
 
   def image_link_to_unless_current(name, image = nil, options = nil, html_options = {})
     name, html_options = link_or_button_options(:link, name, image, html_options)
-    # NOTE: Starting from Rails 8.1.0, below condition can be replaced with:
+    if current_page?(options, method: [:get, :post])
-    #   current_page?(options, method: [:get, :post])
-    if request.path == url_for(options)
       html_options = html_options.deep_merge DISABLED_ATTRIBUTES
     end
     link_to name, options, html_options
   end
 
-  def render_errors(records)
+  def render_flash
-    # Conversion of flash to Array only required because of Devise
-    # TODO: override Devise message setting to Array()?
-    flash[:alert] = Array(flash[:alert])
-    Array(records).each { |record| flash[:alert] += record.errors.full_messages }
-  end
-
-  def render_flash_messages
     flash.map do |entry, messages|
-      # Conversion of flash to Array only required because of Devise
+      # 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.span(sanitize(message)) +
-          tag.div(sanitize(message)) + tag.button(sanitize("&times;"), tabindex: -1,
+            svg_tag('close-outline', {onclick: "this.parentElement.remove()"})
-                                                  onclick: "this.parentElement.remove();")
         end
       end
     end.join.html_safe
@@ -246,7 +239,7 @@ module ApplicationHelper
     link_is_local = html_options[:onclick] || html_options.dig(:data, :turbo_stream)
     name = name.to_s
     name += '...' if type == :link && !link_is_local
-    name = svg_tag("pictograms/#{image}", name) if image
+    name = svg_tag(image, name) if image
 
     [name, html_options]
   end

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

app/javascript/application.js

@@ -1,14 +1,18 @@
 // Configure your import map in config/importmap.rb. Read more:
 // https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
+// TODO: access `data-` attributes through
+// `keyname in`/`dataset.keyname`/`delete dataset.keyname`
 
 
-/* Hide page before loaded for testing purposes */
+// Show page if hidden for testing purposes.
 function showPage(event) {
   document.documentElement.style.visibility="visible"
 }
 document.addEventListener('turbo:load', showPage)
 
+
+// <details> event handlers.
 function detailsChange(event) {
   var target = event.currentTarget
   var count = target.querySelectorAll('input:checked:not([disabled])').length
@@ -24,7 +28,7 @@ function detailsChange(event) {
 }
 window.detailsChange = detailsChange
 
-/* Close open <details> when focus lost */
+// Close open <details> when focus lost.
 function detailsClose(event) {
   if (!event.relatedTarget ||
       event.relatedTarget.closest("details") != event.currentTarget) {
@@ -37,6 +41,8 @@ window.detailsObserver = new MutationObserver((mutations) => {
   mutations[0].target.dispatchEvent(new Event('change', {bubbles: true}))
 });
 
+
+// Validation of multiple-submit forms with different field requirements.
 function formValidate(event) {
   var id = event.submitter.getAttribute("data-validate")
   if (!id) return;
@@ -49,28 +55,58 @@ function formValidate(event) {
 }
 window.formValidate = formValidate
 
+// Pattern for number precision verification. Should accept all number formats
+// accepted by Kernel#Float. Lookahead checks the number of significant digits
+// in mantissa, following expression makes sure there is only one dot.
+const numberRegExp = /^\-?(?=(?:\.?0)*(?:\.?\d){1,15}?(?:\.?0)*\.?(?:[eE]|$))(?<mantissa>\d*\.?\d+|\d+\.)(?:[eE]\-?\d{1,3})?$/
 
-/* Turbo stream actions */
+// Validation of input[type=number] value precision.
+function numberValidate(event) {
+  var input = event.target
+
+  input.setCustomValidity("")
+  if (!input.validity.valid) return
+
+  var match = numberRegExp.exec(input.value)
+  if (!match ||
+      (parseFloat(input.value) == 0.0 && match.groups['mantissa'].match(/[1-9]/))) {
+    // TODO: move message to locales
+    input.setCustomValidity("Please select a value within range of double precision floating-point format.")
+  }
+}
+window.numberValidate = numberValidate
+
+
+// Turbo stream actions.
+const FORM_CONTROLS = ["BUTTON", "FIELDSET", "INPUT", "OPTGROUP", "OPTION", "SELECT",
+                       "TEXTAREA"]
 Turbo.StreamElement.prototype.disableElement = function(element) {
+  if (FORM_CONTROLS.includes(element.tagName)) {
     element.setAttribute("disabled", "disabled")
+  } else {
     element.setAttribute("aria-disabled", "true")
+    // NOTE: tabindex should not be disabled?
     element.setAttribute("tabindex", "-1")
+  }
 }
 Turbo.StreamActions.disable = function() {
   this.targetElements.forEach((e) => { this.disableElement(e) })
 }
 
 Turbo.StreamElement.prototype.enableElement = function(element) {
+  if (FORM_CONTROLS.includes(element.tagName)) {
     element.removeAttribute("disabled")
+  } else {
     element.removeAttribute("aria-disabled")
-    // Assume 'tabindex' is not used explicitly, so removing it is safe
+    // Assume 'tabindex' is not used explicitly, so removing it is safe.
     element.removeAttribute("tabindex")
+  }
 }
 Turbo.StreamActions.enable = function() {
   this.targetElements.forEach((e) => { this.enableElement(e) })
 }
 
-/* TODO: change to visibility = collapse to avoid width change? */
+// TODO: change to visibility = collapse to avoid width change?
 Turbo.StreamActions.hide = function() {
   this.targetElements.forEach((e) => { e.style.display = "none" })
 }
@@ -87,7 +123,7 @@ Turbo.StreamActions.collapse = function() {
 
 Turbo.StreamActions.close_form = function() {
   this.targetElements.forEach((e) => {
-    /* Move focus if there's no focus or focus inside form being closed */
+    // Move focus if there's no focus or focus inside form being closed.
     const focused = document.activeElement
     if (!focused || (focused == document.body) || e.contains(focused)) {
       let nextForm = e.parentElement.querySelector(`#${e.id} ~ tr:has([autofocus])`)
@@ -112,6 +148,35 @@ Turbo.StreamActions.unselect = function() {
   })
 }
 
+Turbo.StreamActions.validate = function() {
+  this.targetElements.forEach((form) => {
+    this.templateContent.querySelectorAll("span").forEach((span) => {
+      var control = document.querySelector(
+        `[form="${form.id}"][name="${span.dataset.name}"]`
+      )
+      control.setCustomValidity(span.textContent)
+      // Add event listener in capture phase to clear custom validity before
+      // `[oninput]` or any other bubble phase handler is invoked.
+      //   https://www.quirksmode.org/js/events_order.html
+      // TODO: keep invalidating current value whenever user re-enters it. Store
+      // invalid value and validation message in `[data-invalid-message/value]`
+      // and check input value on "input" event (below) (using `[pattern]` may not
+      // be suitable due to inability to customize validtion message; also
+      // pattern may be used for other, conflicting purposes).
+      // After user executes any other action (while form is open), remove `[data-]`
+      // attributes and custom validation, as value may no longer be invalid.
+      control.addEventListener(
+        "input",
+        function(event) { event.target.setCustomValidity("") },
+        {capture: true, once: true}
+      )
+    })
+    form.reportValidity()
+  })
+}
+
+
+// Keyboard event processing handlers.
 function formProcessKey(event) {
   switch (event.key) {
     case "Escape":
@@ -138,7 +203,7 @@ function detailsProcessKey(event) {
       var button = event.currentTarget.querySelector("button:not([disabled])")
       if (button) {
         button.click()
-        // Autofocus won't be respected unless target is blurred
+        // Autofocus won't be respected unless target is blurred.
         event.target.blur()
         event.preventDefault()
         event.stopPropagation()
@@ -148,7 +213,8 @@ function detailsProcessKey(event) {
 }
 window.detailsProcessKey = detailsProcessKey;
 
-/* Items table drag and drop support */
+
+// Items table drag and drop support.
 var lastEnterTime
 function dragStart(event) {
   lastEnterTime = event.timeStamp
@@ -158,7 +224,8 @@ function dragStart(event) {
   })
   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.setDragImage(row, event.x - rowRectangle.left,
+                                  event.y - rowRectangle.top)
   event.dataTransfer.dropEffect = "move"
 }
 window.dragStart = dragStart
@@ -168,9 +235,11 @@ window.dragStart = dragStart
 *   * 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
+*     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.
+* TODO: replace Leave table with Enter document?
+*   https://www.quirksmode.org/js/events_order.html#link4
 */
 function dragEnter(event) {
   //console.log(event.timeStamp + " " + event.type + ": " + event.currentTarget.id)
@@ -188,7 +257,7 @@ 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
+  // 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")

app/models/application_record.rb

@@ -1,4 +1,6 @@
 class ApplicationRecord < ActiveRecord::Base
+  include ActionView::Helpers::TagHelper
+
   class << self
     # Cached attribute has non-user assignable value calculated from other
     # attributes' values on create/update. This simplifies and speeds up

app/models/note.rb

@@ -0,0 +1,3 @@
+class Note < ApplicationRecord
+  ATTRIBUTES = [:text]
+end

app/models/quantity.rb

@@ -6,12 +6,14 @@ class Quantity < ApplicationRecord
   belongs_to :parent, optional: true, class_name: "Quantity"
   has_many :subquantities, ->{ order(:name) }, class_name: "Quantity",
     inverse_of: :parent, dependent: :restrict_with_error
+  has_many :readouts, dependent: :restrict_with_error
 
   validate if: ->{ parent.present? } do
     errors.add(:parent, :user_mismatch) unless user_id == parent.user_id
     errors.add(:parent, :self_reference) if id == parent_id
   end
   validate if: ->{ parent.present? }, on: :update do
+    # TODO: should not report error for (parent == self)
     errors.add(:parent, :descendant_reference) if ancestor_of?(parent)
   end
   validates :name, presence: true, uniqueness: {scope: [:user_id, :parent_id]},
@@ -63,16 +65,10 @@ class Quantity < ApplicationRecord
   scope :ordered, ->(root: nil, include_root: true) {
     numbered = Arel::Table.new('numbered')
 
-    path_expr = if connection.adapter_name =~ /mysql/i
-      numbered.cast(numbered[:child_number], 'BINARY')
-    else
-      numbered[:child_number]
-    end
-
     self.model.with(numbered: numbered(:parent_id, :name)).with_recursive(arel_table.name => [
       numbered.project(
         numbered[Arel.star],
-        path_expr.as('path')
+        numbered.cast(numbered[:child_number], 'BINARY').as('path')
       ).where(numbered[root && include_root ? :id : :parent_id].eq(root)),
       numbered.project(
         numbered[Arel.star],
@@ -86,29 +82,24 @@ class Quantity < ApplicationRecord
   # be merged with :ordered
   # https://gist.github.com/ProGM/c6df08da14708dcc28b5ca325df37ceb#extending-arel
   scope :numbered, ->(parent_column, order_column) {
-    row_num = Arel::Nodes::NamedFunction.new('ROW_NUMBER', [])
+    select(
-      .over(Arel::Nodes::Window.new.partition(parent_column).order(order_column))
+      arel_table[Arel.star],
-
-    child_number = if connection.adapter_name =~ /mysql/i
       Arel::Nodes::NamedFunction.new(
         'LPAD',
         [
-          row_num,
+          Arel::Nodes::NamedFunction.new('ROW_NUMBER', [])
+            .over(Arel::Nodes::Window.new.partition(parent_column).order(order_column)),
           Arel::SelectManager.new.project(
             Arel::Nodes::NamedFunction.new('LENGTH', [Arel.star.count])
           ).from(arel_table),
           Arel::Nodes.build_quoted('0')
-        ]
+        ],
-      )
+      ).as('child_number')
-    else
+    )
-      Arel::Nodes::NamedFunction.new('format', [Arel::Nodes.build_quoted('%09d'), row_num])
-    end
-
-    select(arel_table[Arel.star], child_number.as('child_number'))
   }
 
   def to_s
-    name
+    tag.pre name
   end
 
   def to_s_with_depth

app/models/readout.rb

@@ -4,4 +4,6 @@ class Readout < ApplicationRecord
   belongs_to :user
   belongs_to :quantity
   belongs_to :unit
+
+  # TODO: validate quantity.user_id == unit.user_id != NULL
 end

app/models/unit.rb

@@ -1,8 +1,9 @@
 class Unit < ApplicationRecord
-  ATTRIBUTES = [:symbol, :description, :multiplier, :base_id]
+  ATTRIBUTES = {unit: [:symbol, :description, :multiplier, :base_id]}
 
   belongs_to :user, optional: true
   belongs_to :base, optional: true, class_name: "Unit"
+  alias_method :parent, :base
   has_many :subunits, class_name: "Unit", inverse_of: :base,
     dependent: :restrict_with_error
 
@@ -14,8 +15,8 @@ class Unit < ApplicationRecord
   validates :symbol, presence: true, uniqueness: {scope: :user_id},
     length: {maximum: type_for_attribute(:symbol).limit}
   validates :description, length: {maximum: type_for_attribute(:description).limit}
-  validates :multiplier, numericality: {equal_to: 1}, unless: :base
+  validates :multiplier, numericality: {equal_to: 1.0}, unless: :base
-  validates :multiplier, numericality: {greater_than: 0, precision: true, scale: true}, if: :base
+  validates :multiplier, numericality: {greater_than: 0.0}, if: :base
 
   scope :defaults, ->{ where(user: nil) }
   scope :defaults_diff, ->{
@@ -77,23 +78,21 @@ class Unit < ApplicationRecord
       .from(units).group(:base_id, :symbol)
   }
   scope :ordered, ->{
-    left_outer_joins(:base).order(ordering)
+    left_outer_joins(:base).order([
+      arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
+      arel_table[:base_id].not_eq(nil),
+      arel_table[:multiplier],
+      arel_table[:symbol]
+    ])
   }
 
-  def self.ordering
-    [arel_table.coalesce(Arel::Table.new(:bases_units)[:symbol], arel_table[:symbol]),
-     arel_table[:base_id].not_eq(nil),
-     :multiplier,
-     :symbol]
-  end
-
   before_destroy do
     # TODO: disallow destruction if any object depends on this unit
     nil
   end
 
   def to_s
-    symbol
+    tag.pre symbol
   end
 
   def movable?
@@ -104,21 +103,21 @@ class Unit < ApplicationRecord
     user_id.nil?
   end
 
-  # Should only by invoked on Units returned from #defaults_diff which are #portable
+  # Should only by invoked on Units returned from #defaults_diff which are #portable.
   def port!(recipient)
     recipient_base = base && Unit.find_by!(symbol: base.symbol, user: recipient)
-    params = slice(ATTRIBUTES - [:symbol, :base_id])
+    params = slice(ATTRIBUTES[:unit] - [:symbol, :base_id])
     Unit.find_or_initialize_by(user: recipient, symbol: symbol)
       .update!(base: recipient_base, **params)
   end
 
   def successive
     units = Unit.arel_table
-    lead = Arel::Nodes::NamedFunction.new('LAG', [units[:id]])
+    Unit.with(units_with_lag: user.units.left_outer_joins(:base).select(
-    window = Arel::Nodes::Window.new.order(*Unit.ordering)
+      units[Arel.star],
-    lag_id = lead.over(window).as('lag_id')
+      Arel::Nodes::NamedFunction.new('LAG', [units[:id]])
-    Unit.with(
+        .over(Arel::Nodes::Window.new.order(Unit.ordered.order_values)).as('lag_id')
-      units: user.units.left_outer_joins(:base).select(units[Arel.star], lag_id)
+    )).from(Arel::Table.new(:units_with_lag).as(:units))
-    ).where(units[:lag_id].eq(id)).first
+      .where(units[:lag_id].eq(id)).take
   end
 end

app/views/application/errors.turbo_stream.erb

@@ -0,0 +1,7 @@
+<%= turbo_stream.validate dom_target(*@target, :form) do %>
+  <% @record.errors.attribute_names.map do |attr| %>
+    <%= tag.span data: {name: field_name(dom_class(@record), attr)} do %>
+      <%- @record.errors.full_messages_for(attr).map { |m| m + '.' }.join(' ') %>
+    <% end %>
+  <% end %>
+<% end %>

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',

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>

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) %>
@@ -44,7 +44,7 @@
     </header>
 
     <div id="flashes">
-      <%= render_flash_messages %>
+      <%= render_flash %>
     </div>
 
     <%# Allows overwriting/clearing navigation menu for some views %>

app/views/layouts/application.turbo_stream.erb

@@ -1,6 +1,6 @@
-<%= yield %>
+<%# Render unconditionally, to clear previous flash messages. %>
-
-<%# Some views may convert ActiveRecord errors to flashes, render at the end. %>
 <%= turbo_stream.update :flashes do %>
-  <%= render_flash_messages %>
+  <%= render_flash %>
 <% end %>
+
+<%= yield %>

app/views/measurements/_form.html.erb

@@ -1,30 +1,39 @@
 <%= tabular_form_with model: Measurement.new, id: :measurement_form,
-  class: 'topside-area vflex', html: {onkeydown: 'formProcessKey(event)'} do |form| %>
+  class: 'topside-area flex vertical center',
-  <table class="items centered">
+  html: {onkeydown: 'formProcessKey(event)'} do |form| %>
-    <tbody id="readouts"></tbody>
+
+  <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 %>
+          </td>
+        </tr>
+      <% end %>
+    </tbody>
   </table>
 
-  <div class="hflex">
+  <%# TODO: right-click selection; unnecessary with hierarchical tags? %>
-    <%# TODO: right-click selection %>
+  <details id="quantity_select" class="center hexpand" open
-    <details id="quantity_select" class="hexpand" open
+           onkeydown="detailsProcessKey(event)">
-             onkeydown="detailsProcessKey(event)">
+    <summary autofocus>
-      <summary autofocus>
+      <!-- TODO: Set content with CSS when span empty to avoid duplication -->
-        <!-- TODO: Set content with CSS when span empty to avoid duplication -->
+      <span data-prompt="<%= t('.select_quantity') %>">
-        <span data-prompt="<%= t('.select_quantity') %>">
+        <%= t('.select_quantity') %>
-          <%= t('.select_quantity') %>
+      </span>
-        </span>
+      <%= image_button_tag t(:apply), "update", name: nil, disabled: true,
-        <%= image_button_tag t(:apply), "update", name: nil, disabled: true,
+        formaction: new_readout_path, formmethod: :get, formnovalidate: true,
-          formaction: new_readout_path, formmethod: :get, formnovalidate: true,
+        data: {turbo_stream: true} %>
-          data: {turbo_stream: true} %>
+    </summary>
-      </summary>
+    <ul><%= quantities_check_boxes(@quantities) %></ul>
-      <ul><%= quantities_check_boxes %></ul>
+  </details>
-    </details>
-    <%= form.button id: :create_measurement_button, disabled: true -%>
-  </div>
 
-  <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') %>
+      class: 'auxiliary dangerous', onclick: render_turbo_stream('form_close') %>
   </div>
 <% end %>
 

app/views/quantities/_form.html.erb

@@ -9,7 +9,7 @@
       <%= form.text_area :description, cols: 30, rows: 1, escape: false %>
     </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}) %>

app/views/quantities/_quantity.html.erb

@@ -5,14 +5,14 @@
            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 %>">
+  <td style="--depth:<%= quantity.depth %>">
-    <%= link_to quantity, edit_quantity_path(quantity), onclick: 'this.blur();',
+    <%= link_to quantity, edit_quantity_path(quantity), class: 'link',
-      data: {turbo_stream: true} %>
+      onclick: 'this.blur();', data: {turbo_stream: true} %>
   </td>
   <td><%= quantity.description %></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} %>
 

app/views/quantities/index.html.erb

@@ -8,13 +8,14 @@
     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>
       <% if current_user.at_least(:active) %>
         <th><%= t :actions %></th>
         <th></th>

app/views/readouts/_form.html.erb

@@ -1,25 +1,24 @@
 <%# 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: ''}, required: true %>
+    </td>
+    <td class="flex">
       <%# TODO: change to _link_ after giving up displaying relative paths %>
       <%= 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 %>

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? %>
+      <%= form.number_field :multiplier, required: true 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}) %>

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

app/views/units/create.turbo_stream.erb

@@ -1,4 +1,4 @@
-<%= turbo_stream.close_form dom_id(@unit.base || Unit, :new) %>
+<%= turbo_stream.close_form dom_target(:new, @unit.base || :unit) %>
 <%= turbo_stream.remove :no_items %>
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
 <%= @before ? turbo_stream.before(@before, @unit) : turbo_stream.append(:units, @unit) %>

app/views/units/edit.turbo_stream.erb

@@ -1,7 +1,7 @@
-<% ids = {row: dom_id(@unit, :edit),
+<% ids = {row: dom_target(:edit, @unit),
-          hidden_row: dom_id(@unit),
+          hidden_row: dom_target(@unit),
           link: nil,
-          form_tag: dom_id(@unit, :edit, :form)} %>
+          form_tag: dom_target(:edit, @unit, :form)} %>
 
 <%= turbo_stream.append :unit_form do %>
   <%- tabular_form_with model: @unit, html: {id: ids[:form_tag]} do %>

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>

app/views/units/new.turbo_stream.erb

@@ -1,8 +1,8 @@
-<% dom_obj = @unit.base || @unit %>
+<% target_id = dom_target(:new, @unit.base || :unit) %>
-<% ids = {row: dom_id(dom_obj, :new),
+<% ids = {row: target_id,
           hidden_row: nil,
-          link: dom_id(dom_obj, :new, :link),
+          link: dom_target(target_id, :link),
-          form_tag: dom_id(dom_obj, :new, :form)} %>
+          form_tag: dom_target(target_id, :form)} %>
 
 <%= turbo_stream.disable ids[:link] -%>
 

app/views/units/rebase.turbo_stream.erb

@@ -1,4 +1,4 @@
 <%= turbo_stream.remove @unit %>
 <%= turbo_stream.replace @previous_base if @previous_base %>
-<%= turbo_stream.replace @unit.base if @unit.base_id? && (@previous_base.id != @unit.base_id) %>
+<%= turbo_stream.replace @unit.base if @unit.base_id? && (@previous_base&.id != @unit.base_id) %>
 <%= @before ? turbo_stream.before(@before, @unit) : turbo_stream.append(:units, @unit) %>

app/views/units/update.turbo_stream.erb

@@ -1,3 +1,3 @@
-<%= turbo_stream.close_form dom_id(@unit, :edit) %>
+<%= turbo_stream.close_form dom_target(:edit, @unit) %>
 <%= turbo_stream.replace @unit.base if @unit.base_id? %>
 <%= turbo_stream.replace @unit %>

app/views/users/index.html.erb

@@ -1,17 +1,17 @@
-<table class="main-area items" id="users">
+<table class="main-area items-table" id="users">
   <thead>
     <tr>
       <th><%= User.human_attribute_name(:email) %></th>
       <th><%= User.human_attribute_name(:status) %></th>
       <th><%= User.human_attribute_name(:confirmed_at) %></th>
-      <th><%= User.human_attribute_name(:created_at) %>&nbsp;<sup>(UTC)</sup></th>
+      <th><pre><%= User.human_attribute_name(:created_at) %> <sup>(UTC)</sup></pre></th>
       <th><%= t :actions %></th>
     </tr>
   </thead>
   <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 +22,9 @@
             <% end %>
           <% end %>
         </td>
-        <td class="svg">
+        <td><%= svg_tag 'checkbox-marked-outline' if user.confirmed_at.present? %></td>
-          <%= svg_tag 'pictograms/checkbox-marked-outline' if user.confirmed_at.present? %>
+        <td><pre><%= l user.created_at, format: :without_tz %></pre></td>
-        </td>
+        <td class="flex">
-        <td><%= l user.created_at, format: :without_tz %></td>
-        <td class="actions">
           <% if allow_disguise?(user) %>
             <%= image_link_to t('.disguise'), 'incognito', disguise_user_path(user) %>
           <% end %>

app/views/users/passwords/create.turbo_stream.erb

@@ -1,2 +1 @@
-<%# For some reason flash messages are duplicated in bot flash and flash.now %>
 <% flash.discard %>

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

@@ -1,5 +1,5 @@
 <% content_for :navigation, flush: true do %>
-  <%= link_to svg_tag('pictograms/arrow-left-bold-outline', t(:back)),
+  <%= link_to svg_tag('arrow-left-bold-outline', t(:back)),
     request.referer.present? ? :back : root_path, class: 'tab' %>
 <% end %>
 

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)} %>

app/views/users/show.html.erb

@@ -1,6 +1,5 @@
 <% content_for :navigation, flush: true do %>
-  <%= link_to svg_tag('pictograms/arrow-left-bold-outline', t(:back)), users_path,
+  <%= link_to svg_tag('arrow-left-bold-outline', t(:back)), users_path, class: 'tab' %>
-    class: 'tab' %>
 <% end %>
 
 <%= labeled_form_for @user, html: {class: 'main-area'} do |f| %>

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 %>

bin/ci

@@ -0,0 +1,6 @@
+#!/usr/bin/env ruby
+require_relative "../config/boot"
+require "active_support/continuous_integration"
+
+CI = ActiveSupport::ContinuousIntegration
+require_relative "../config/ci.rb"

bin/dev

@@ -0,0 +1,2 @@
+#!/usr/bin/env ruby
+exec "./bin/rails", "server", *ARGV

bin/nokogiri

@@ -0,0 +1,29 @@
+#!/usr/bin/ruby33
+#
+# This file was generated by RubyGems.
+#
+# The application 'nokogiri' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+require 'rubygems'
+
+Gem.use_gemdeps
+
+version = ">= 0.a"
+
+str = ARGV.first
+if str
+  str = str.b[/\A_(.*)_\z/, 1]
+  if str and Gem::Version.correct?(str)
+    version = str
+    ARGV.shift
+  end
+end
+
+if Gem.respond_to?(:activate_bin_path)
+load Gem.activate_bin_path('nokogiri', 'nokogiri', version)
+else
+gem "nokogiri", version
+load Gem.bin_path("nokogiri", "nokogiri", version)
+end

bin/setup

@@ -1,11 +1,10 @@
 #!/usr/bin/env ruby
 require "fileutils"
 
-# path to your application root.
 APP_ROOT = File.expand_path("..", __dir__)
 
 def system!(*args)
-  system(*args) || abort("\n== Command #{args} failed ==")
+  system(*args, exception: true)
 end
 
 FileUtils.chdir APP_ROOT do
@@ -14,7 +13,6 @@ FileUtils.chdir APP_ROOT do
   # Add necessary setup steps to this file.
 
   puts "== Installing dependencies =="
-  system! "gem install bundler --conservative"
   system("bundle check") || system!("bundle install")
 
   # puts "\n== Copying sample files =="
@@ -24,10 +22,14 @@ FileUtils.chdir APP_ROOT do
 
   puts "\n== Preparing database =="
   system! "bin/rails db:prepare"
+  system! "bin/rails db:reset" if ARGV.include?("--reset")
 
   puts "\n== Removing old logs and tempfiles =="
   system! "bin/rails log:clear tmp:clear"
 
-  puts "\n== Restarting application server =="
+  unless ARGV.include?("--skip-server")
-  system! "bin/rails restart"
+    puts "\n== Starting development server =="
+    STDOUT.flush # flush the output before exec(2) so that it displays
+    exec "bin/dev"
+  end
 end

config/application.rb.dist

@@ -18,14 +18,17 @@ require "rails/test_unit/railtie"
 # you've limited to :test, :development, or :production.
 Bundler.require(*Rails.groups)
 
+require_relative '../lib/default_settings_strategy'
+
 module FixinMe
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
-    config.load_defaults 7.0
+    config.load_defaults 8.1
 
-    # Autoload lib/, required e.g. for core library extensions.
+    # Please, add to the `ignore` list any other `lib` subdirectories that do
-    # https://guides.rubyonrails.org/autoloading_and_reloading_constants.html#config-autoload-lib-ignore.
+    # not contain `.rb` files, or that should not be reloaded or eager loaded.
-    config.autoload_lib(ignore: %w(assets tasks))
+    # Common ones are `templates`, `generators`, or `middleware`, for example.
+    config.autoload_lib(ignore: %w[assets tasks])
 
     # Configuration for the application, engines, and railties goes here.
     #
@@ -38,16 +41,19 @@ module FixinMe
     config.action_dispatch.rescue_responses['ApplicationController::AccessForbidden'] = :forbidden
     config.action_dispatch.rescue_responses['ApplicationController::ParameterInvalid'] = :unprocessable_entity
 
+    # Set default migrations parameters.
+    config.active_record.migration_strategy = DefaultSettingsStrategy
+
     # SETUP: Below settings need to be updated on a per-installation basis.
     #
-    # URL to use in sent e-mails.
+    # Set host to be used by links generated in mailer templates.
-    config.action_mailer.default_url_options = {host: 'localhost', :protocol => 'https'}
+    config.action_mailer.default_url_options = {host: 'localhost', protocol: 'https'}
     # https://guides.rubyonrails.org/configuring.html#config-action-mailer-delivery-method
     config.action_mailer.delivery_method = :sendmail
 
     # List of hosts this app is available at.
     # https://guides.rubyonrails.org/configuring.html#actiondispatch-hostauthorization
-    config.hosts += ['localhost', 'example.com', IPAddr.new('1.2.3.4/32')]
+    config.hosts |= ['localhost']
 
     # Email address of admin account
     config.admin = 'admin@localhost'

config/ci.rb

@@ -0,0 +1,20 @@
+# Run using bin/ci
+
+CI.run do
+  step "Setup", "bin/setup --skip-server"
+
+  step "Security: Importmap vulnerability audit", "bin/importmap audit"
+  step "Tests: Rails", "bin/rails test"
+  step "Tests: Seeds", "env RAILS_ENV=test bin/rails db:seed:replant"
+
+  # Optional: Run system tests
+  # step "Tests: System", "bin/rails test:system"
+
+  # Optional: set a green GitHub commit status to unblock PR merge.
+  # Requires the `gh` CLI and `gh extension install basecamp/gh-signoff`.
+  # if success?
+  #   step "Signoff: All systems go. Ready for merge and deploy.", "gh signoff"
+  # else
+  #   failure "Signoff: CI failed. Do not merge or deploy.", "Fix the issues and try again."
+  # end
+end

config/database.yml.dist

@@ -24,27 +24,45 @@
 # Read https://guides.rubyonrails.org/configuring.html#configuring-a-database
 # for a full overview on how database connection configuration can be specified.
 default: &default
-  adapter: mysql2
+  pool: <%= ENV.fetch('RAILS_MAX_THREADS', 3) %>
-  encoding: utf8mb4
+
-  collation: utf8mb4_0900_as_ci
+#mysql_default: &mysql_default
-  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
+#  <<: *default
-  username: fixinme
+#  username: fixinme
-  password: Some-password1%
+#  password: Some-password1%
-  socket: /run/mysqld/mysqld.sock
+#  host: 127.0.0.1
+#  encoding: utf8mb4
+#  collation: utf8mb4_0900_as_ci
 
 production:
   <<: *default
-  database: fixinme
+  adapter: sqlite3
+  database: db/production.sqlite3
 
-# Unless you're planning on developing the application, you can skip
+# Unless you're planning on developing the application, you can skip/remove
 # configurations for development and test databases altogether.
 #development:
-#  <<: *default
+#  <<: *mysql_default
+#  adapter: mysql2
 #  database: fixinme_dev
 
-# Warning: The database defined as "test" will be erased and
+# Warning: The database(s) defined as "test" will be erased and
 # re-generated from your development database when you run "rake".
 # Do not set this db to the same as development or production.
 #test:
-#  <<: *default
+#  <<: *mysql_default
+#  adapter: mysql2
 #  database: fixinme_test
+
+# Multiple test databases can be provided. When more than one test db is
+# present, every test task (test, test:models, test:system, etc.) runs against
+# all of them.
+#test:
+#  mysql2:
+#    <<: *mysql_default
+#    adapter: mysql2
+#    database: fixinme_test
+#  sqlite3:
+#    <<: *default
+#    adapter: sqlite3
+#    database: db/test.sqlite3

config/environments/development.rb

@@ -3,10 +3,8 @@ require "active_support/core_ext/integer/time"
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
-  # In the development environment your application's code is reloaded any time
+  # Make code changes take effect immediately without server restart.
-  # it changes. This slows down response time but is perfect for development
+  config.enable_reloading = true
-  # since you don't have to restart the web server when you make code changes.
-  config.cache_classes = false
 
   # Do not eager load code on boot.
   config.eager_load = false
@@ -14,54 +12,52 @@ Rails.application.configure do
   # Show full error reports.
   config.consider_all_requests_local = true
 
-  # Enable server timing
+  # Enable server timing.
   config.server_timing = true
 
-  # Enable/disable caching. By default caching is disabled.
+  # Enable/disable Action Controller caching. By default Action Controller caching is disabled.
-  # Run rails dev:cache to toggle caching.
+  # Run rails dev:cache to toggle Action Controller caching.
   if Rails.root.join("tmp/caching-dev.txt").exist?
     config.action_controller.perform_caching = true
     config.action_controller.enable_fragment_cache_logging = true
-
+    config.public_file_server.headers = { "cache-control" => "public, max-age=#{2.days.to_i}" }
-    config.cache_store = :memory_store
-    config.public_file_server.headers = {
-      "Cache-Control" => "public, max-age=#{2.days.to_i}"
-    }
   else
     config.action_controller.perform_caching = false
-
-    config.cache_store = :null_store
   end
 
+  # Change to :null_store to avoid any caching.
+  config.cache_store = :memory_store
+
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = false
 
+  # Make template changes take effect immediately.
   config.action_mailer.perform_caching = false
 
   # Print deprecation notices to the Rails logger.
   config.active_support.deprecation = :log
 
-  # Raise exceptions for disallowed deprecations.
-  config.active_support.disallowed_deprecation = :raise
-
-  # Tell Active Support which deprecation messages to disallow.
-  config.active_support.disallowed_deprecation_warnings = []
-
   # Raise an error on page load if there are pending migrations.
   config.active_record.migration_error = :page_load
 
   # Highlight code that triggered database queries in logs.
   config.active_record.verbose_query_logs = true
 
-  # Suppress logger output for asset requests.
+  # Append comments with runtime information tags to SQL queries in logs.
-  config.assets.quiet = true
+  config.active_record.query_log_tags_enabled = true
+
+  # Highlight code that enqueued background job in logs.
+  config.active_job.verbose_enqueue_logs = true
+
+  # Highlight code that triggered redirect in logs.
+  config.action_dispatch.verbose_redirect_logs = true
 
   # Raises error for missing translations.
   # config.i18n.raise_on_missing_translations = true
 
   # Annotate rendered view with file names.
-  # config.action_view.annotate_rendered_view_with_filenames = true
+  config.action_view.annotate_rendered_view_with_filenames = true
 
-  # Uncomment if you wish to allow Action Cable access from any origin.
+  # Raise error when a before_action's only/except options reference missing actions.
-  # config.action_cable.disable_request_forgery_protection = true
+  config.action_controller.raise_on_missing_callback_actions = true
 end

config/environments/production.rb

@@ -4,78 +4,83 @@ Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
   # Code is not reloaded between requests.
-  config.cache_classes = true
+  config.enable_reloading = false
 
-  # Eager load code on boot. This eager loads most of Rails and
+  # Eager load code on boot for better performance and memory savings (ignored by Rake tasks).
-  # your application in memory, allowing both threaded web servers
-  # and those relying on copy on write to perform better.
-  # Rake tasks automatically ignore this option for performance.
   config.eager_load = true
 
-  # Full error reports are disabled and caching is turned on.
+  # Full error reports are disabled.
-  config.consider_all_requests_local       = false
+  config.consider_all_requests_local = false
+
+  # Turn on fragment caching in view templates.
   config.action_controller.perform_caching = true
 
-  # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
+  # Cache assets for far-future expiry since they are all digest stamped.
-  # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
+  config.public_file_server.headers = { "cache-control" => "public, max-age=#{1.year.to_i}" }
-  # config.require_master_key = true
-
-  # Disable serving static files from the `/public` folder by default since
-  # Apache or NGINX already handles this.
-  config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
-
-  # Compress CSS using a preprocessor.
-  # config.assets.css_compressor = :sass
-
-  # Do not fallback to assets pipeline if a precompiled asset is missed.
-  config.assets.compile = false
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server.
   # config.asset_host = "http://assets.example.com"
 
-  # Specifies the header that your server uses for sending files.
+  # Assume all access to the app is happening through a SSL-terminating reverse proxy.
-  # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for Apache
+  config.assume_ssl = true
-  # config.action_dispatch.x_sendfile_header = "X-Accel-Redirect" # for NGINX
 
   # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
-  # config.force_ssl = true
+  config.force_ssl = true
 
-  # Include generic and useful information about system operation, but avoid logging too much
+  # Skip http-to-https redirect for the default health check endpoint.
-  # information to avoid inadvertent exposure of personally identifiable information (PII).
+  # config.ssl_options = { redirect: { exclude: ->(request) { request.path == "/up" } } }
-  config.log_level = :info
 
-  # Prepend all log lines with the following tags.
+  # Log to STDOUT with the current request id as a default log tag.
   config.log_tags = [ :request_id ]
+  config.logger   = ActiveSupport::TaggedLogging.logger(STDOUT)
 
-  # Use a different cache store in production.
+  # Change to "debug" to log everything (including potentially personally-identifiable information!).
+  config.log_level = ENV.fetch("RAILS_LOG_LEVEL", "info")
+
+  # Prevent health checks from clogging up the logs.
+  config.silence_healthcheck_path = "/up"
+
+  # Don't log any deprecations.
+  config.active_support.report_deprecations = false
+
+  # Replace the default in-process memory cache store with a durable alternative.
   # config.cache_store = :mem_cache_store
 
-  config.action_mailer.perform_caching = false
+  # Replace the default in-process and non-durable queuing backend for Active Job.
+  # config.active_job.queue_adapter = :resque
 
   # Ignore bad email addresses and do not raise email delivery errors.
   # Set this to true and configure the email server for immediate delivery to raise delivery errors.
   # config.action_mailer.raise_delivery_errors = false
 
+  # Specify outgoing SMTP server. Remember to add smtp/* credentials via bin/rails credentials:edit.
+  # config.action_mailer.smtp_settings = {
+  #   user_name: Rails.application.credentials.dig(:smtp, :user_name),
+  #   password: Rails.application.credentials.dig(:smtp, :password),
+  #   address: "smtp.example.com",
+  #   port: 587,
+  #   authentication: :plain
+  # }
+
   # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
   # the I18n.default_locale when a translation cannot be found).
   config.i18n.fallbacks = true
 
-  # Don't log any deprecations.
-  config.active_support.report_deprecations = false
-
-  # Use default logging formatter so that PID and timestamp are not suppressed.
-  config.log_formatter = ::Logger::Formatter.new
-
-  # Use a different logger for distributed setups.
-  # require "syslog/logger"
-  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new "app-name")
-
-  if ENV["RAILS_LOG_TO_STDOUT"].present?
-    logger           = ActiveSupport::Logger.new(STDOUT)
-    logger.formatter = config.log_formatter
-    config.logger    = ActiveSupport::TaggedLogging.new(logger)
-  end
-
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false
+
+  # Only use :id for inspections in production.
+  config.active_record.attributes_for_inspect = [ :id ]
+
+  # Enable DNS rebinding protection and other `Host` header attacks.
+  # config.hosts = [
+  #   "example.com",     # Allow requests from example.com
+  #   /.*\.example\.com/ # Allow requests from subdomains like `www.example.com`
+  # ]
+  #
+  # Skip DNS rebinding protection for the default health check endpoint.
+  # config.host_authorization = { exclude: ->(request) { request.path == "/up" } }
+
+  # Protect e-mail addresses from being logged only in production.
+  config.filter_parameters += [:email]
 end

config/environments/test.rb

@@ -1,5 +1,3 @@
-require "active_support/core_ext/integer/time"
-
 # The test environment is used exclusively to run your application's
 # test suite. You never need to work with it otherwise. Remember that
 # your test database is "scratch space" for the test suite and is wiped
@@ -8,54 +6,49 @@ require "active_support/core_ext/integer/time"
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
 
-  # Turn false under Spring and add config.action_view.cache_template_loading = true.
+  # While tests run files are not watched, reloading is not necessary.
-  config.cache_classes = true
+  config.enable_reloading = false
 
-  # Eager loading loads your whole application. When running a single test locally,
+  # Eager loading loads your entire application. When running a single test locally,
-  # this probably isn't necessary. It's a good idea to do in a continuous integration
+  # this is usually not necessary, and can slow down your test suite. However, it's
-  # system, or in some way before deploying your code.
+  # recommended that you enable it in continuous integration systems to ensure eager
+  # loading is working properly before deploying your code.
   config.eager_load = ENV["CI"].present?
 
-  # Configure public file server for tests with Cache-Control for performance.
+  # Configure public file server for tests with cache-control for performance.
-  config.public_file_server.enabled = true
+  config.public_file_server.headers = { "cache-control" => "public, max-age=3600" }
-  config.public_file_server.headers = {
-    "Cache-Control" => "public, max-age=#{1.hour.to_i}"
-  }
 
-  # Hide full error reports.
+  # Behave as in `production`.
-  config.consider_all_requests_local     = false
+  config.consider_all_requests_local = false
-  # Render exception templates instead of raising exceptions.
-  config.action_dispatch.show_exceptions = :all
 
-  # Disable caching.
-  config.action_controller.perform_caching = false
   config.cache_store = :null_store
 
   # Disable request forgery protection in test environment.
   config.action_controller.allow_forgery_protection = false
 
-  config.action_mailer.perform_caching = false
-
   # Tell Action Mailer not to deliver emails to the real world.
   # The :test delivery method accumulates sent emails in the
   # ActionMailer::Base.deliveries array.
   config.action_mailer.delivery_method = :test
-  config.action_mailer.default_url_options = {host: '127.0.0.1', :protocol => 'http'}
+
+  # Set host to be used by links generated in mailer templates.
+  config.action_mailer.default_url_options = {host: Capybara.server_host,
+                                              protocol: 'http'}
 
   # Print deprecation notices to the stderr.
   config.active_support.deprecation = :stderr
 
-  # Raise exceptions for disallowed deprecations.
-  config.active_support.disallowed_deprecation = :raise
-
-  # Tell Active Support which deprecation messages to disallow.
-  config.active_support.disallowed_deprecation_warnings = []
-
   # Raises error for missing translations.
   config.i18n.raise_on_missing_translations = true
 
   # Annotate rendered view with file names.
   # config.action_view.annotate_rendered_view_with_filenames = true
 
+  # Raise error when a before_action's only/except options reference missing actions.
+  config.action_controller.raise_on_missing_callback_actions = true
+
+  # Allow Capybara application server IP
+  config.hosts |= [IPAddr.new(Capybara.server_host)]
+
   config.log_level = :info
 end

config/initializers/assets.rb

@@ -5,8 +5,3 @@ Rails.application.config.assets.version = "1.0"
 
 # Add additional assets to the asset load path.
 # Rails.application.config.assets.paths << Emoji.images_path
-
-# Precompile additional assets.
-# application.js, application.css, and all non-JS/CSS in the app/assets
-# folder are already added.
-Rails.application.config.assets.precompile += %w( '*.svg' )

config/initializers/content_security_policy.rb

@@ -16,9 +16,13 @@
 #     # policy.report_uri "/csp-violation-report-endpoint"
 #   end
 #
-#   # Generate session nonces for permitted importmap and inline scripts
+#   # Generate session nonces for permitted importmap, inline scripts, and inline styles.
 #   config.content_security_policy_nonce_generator = ->(request) { request.session.id.to_s }
-#   config.content_security_policy_nonce_directives = %w(script-src)
+#   config.content_security_policy_nonce_directives = %w(script-src style-src)
+#
+#   # Automatically add `nonce` to `javascript_tag`, `javascript_include_tag`, and `stylesheet_link_tag`
+#   # if the corresponding directives are specified in `content_security_policy_nonce_directives`.
+#   # config.content_security_policy_nonce_auto = true
 #
 #   # Report violations without enforcing the policy.
 #   # config.content_security_policy_report_only = true

config/initializers/core_ext.rb

@@ -1,8 +1,12 @@
 require 'core_ext/array_delete_bang'
-require 'core_ext/big_decimal_scientific_notation'
+require 'core_ext/float'
+require 'core_ext/range'
 
 ActiveSupport.on_load :action_dispatch_system_test_case do
   prepend CoreExt::ActionDispatch::SystemTesting::TestHelpers::ScreenshotHelperUniqueId
+  # Allow denormalized string comparison,
+  # https://github.com/orgs/teamcapybara/discussions/2841
+  XPath::DSL.prepend CoreExt::XPath::DSL::NormalizeSpaceDefault
 end
 
 ActiveSupport.on_load :action_view do
@@ -11,7 +15,7 @@ end
 
 ActiveSupport.on_load :active_record do
   ActiveModel::Validations::NumericalityValidator
-    .prepend CoreExt::ActiveModel::Validations::NumericalityValidatesPrecisionAndScale
+    .prepend CoreExt::ActiveModel::Validations::NumericalityValidatesPrecision
 
   # Temporary patch for https://github.com/rails/rails/pull/54658
   Arel::TreeManager::StatementMethods

config/initializers/devise.rb

@@ -179,7 +179,7 @@ Devise.setup do |config|
 
   # ==> Configuration for :validatable
   # Range for password length.
-  config.password_length = 5..128
+  config.password_length = 5..32
 
   # Email regex used to validate email formats. It simply asserts that
   # one (and only one) @ exists in the given string. This is mainly

config/initializers/filter_parameter_logging.rb

@@ -1,8 +1,8 @@
 # Be sure to restart your server when you modify this file.
 
-# Configure parameters to be filtered from the log file. Use this to limit dissemination of
+# Configure parameters to be partially matched (e.g. passw matches password) and filtered from the log file.
-# sensitive information. See the ActiveSupport::ParameterFilter documentation for supported
+# Use this to limit dissemination of sensitive information.
-# notations and behaviors.
+# See the ActiveSupport::ParameterFilter documentation for supported notations and behaviors.
 Rails.application.config.filter_parameters += [
-  :passw, :secret, :token, :_key, :crypt, :salt, :certificate, :otp, :ssn
+  :passw, :secret, :token, :_key, :crypt, :salt, :certificate, :otp, :ssn, :cvv, :cvc
 ]

config/initializers/turbo_streams_tag_builder.rb

@@ -34,4 +34,8 @@ ActiveSupport.on_load :turbo_streams_tag_builder do
   def unselect(target)
     action :unselect, target, allow_inferred_rendering: false
   end
+
+  def validate(target, content = nil, **rendering, &block)
+    action :validate, target, content, **rendering, &block
+  end
 end

config/locales/en.yml

@@ -1,13 +1,11 @@
 en:
   time:
     formats:
-      # Format contains non-breaking space: 160.chr(Encoding::UTF_8)
+      default: "%Y-%m-%d %H:%M %Z"
-      default: "%Y-%m-%d %H:%M %Z"
+      without_tz: "%Y-%m-%d %H:%M"
-      without_tz: "%Y-%m-%d %H:%M"
   errors:
     messages:
-      precision_exceeded: must not exceed %{value} significant digits
+      out_of_range: exceeds range of double precision floating-point format
-      scale_exceeded: must not exceed %{value} decimal digits
   activerecord:
     attributes:
       quantity:
@@ -43,6 +41,24 @@ en:
               descendant_reference: cannot be changed to any of descendants
               self_reference: of the quantitiy cannot be the quantity itself
               user_mismatch: has to belong to the same user as quantity
+  activesupport:
+    # Based on: https://github.com/unicode-org/cldr-json/blob/main/cldr-json/cldr-misc-full/main/en/characters.json
+    characters:
+      subsets:
+        # :exemplarCharacters[EN]
+        exemplar: abcdefghijklmnopqrstuvwxyz
+        # :index[EN]
+        index: ABCDEFGHIJKLMNOPQRSTUVWXYZ
+        numbers: 0123456789
+        # :exemplarCharacters[DE, PL] - exemplarCharacters[EN] +
+        #   :index[DE, PL] - :index[EN]
+        auxiliary: äößüĆŁÓŚŹŻąćęłńóśźż
+        # :punctuation* + :numbers* - space - numbers
+        punctuation: >-
+          !\"#%&'()*+,-./:;?@[]{|}~§«°»×‐‑–—‘’‚“”„†‡…‰′″−
+        # :exemplarCharacters[EL] + :index[EL]
+        symbols: αάβγδεέζηήθιίϊΐκλμνξοόπρσςτυύϋΰφχψωώΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ
+        space: ' '
   actioncontroller:
     exceptions:
       status:
@@ -61,6 +77,7 @@ en:
   helpers:
     label:
       user:
+        # TODO: remove or reduce all unnecessarily singly and doubly quoted text
         password_confirmation: 'Retype new password:'
         password_length_hint_html:
           count: '%{minimum_password_length}'
@@ -85,12 +102,10 @@ en:
     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 
     index:
       new_measurement: Add measurement
-  readouts:
-    form:
-      select_unit: ...
   quantities:
     navigation: Quantities
     no_items: There are no configured quantities. You can Add some or Import from defaults.

config/puma.rb.dist

@@ -1,43 +1,41 @@
-# Puma can serve each request in a thread from an internal thread pool.
+# This configuration file will be evaluated by Puma. The top-level methods that
-# The `threads` method setting takes two numbers: a minimum and maximum.
+# are invoked here are part of Puma's configuration DSL. For more information
-# Any libraries that use thread pools should be configured to match
+# about methods provided by the DSL, see https://puma.io/puma/Puma/DSL.html.
-# the maximum value specified for Puma. Default is set to 5 threads for minimum
-# and maximum; this matches the default thread size of Active Record.
 #
-max_threads_count = ENV.fetch("RAILS_MAX_THREADS") { 5 }
+# Puma starts a configurable number of processes (workers) and each process
-min_threads_count = ENV.fetch("RAILS_MIN_THREADS") { max_threads_count }
+# serves each request in a thread from an internal thread pool.
-threads min_threads_count, max_threads_count
-
-# Specifies the `worker_timeout` threshold that Puma will use to wait before
-# terminating a worker in development environments.
 #
-worker_timeout 3600 if ENV.fetch("RAILS_ENV", "development") == "development"
+# You can control the number of workers using ENV["WEB_CONCURRENCY"]. You
+# should only set this value when you want to run 2 or more workers. The
+# default is already 1.
+#
+# The ideal number of threads per worker depends both on how much time the
+# application spends waiting for IO operations and on how much you wish to
+# prioritize throughput over latency.
+#
+# As a rule of thumb, increasing the number of threads will increase how much
+# traffic a given process can handle (throughput), but due to CRuby's
+# Global VM Lock (GVL) it has diminishing returns and will degrade the
+# response time (latency) of the application.
+#
+# The default is set to 3 threads as it's deemed a decent compromise between
+# throughput and latency for the average Rails application.
+#
+# Any libraries that use a connection pool or another resource pool should
+# be configured to provide at least as many connections as the number of
+# threads. This includes Active Record's `pool` parameter in `database.yml`.
+threads_count = ENV.fetch("RAILS_MAX_THREADS", 3)
+threads threads_count, threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-#
+port ENV.fetch("PORT", 3000), '127.0.0.1'
-port ENV.fetch("PORT") { 3000 }
-
-# Specifies the `environment` that Puma will run in.
-#
-environment ENV.fetch("RAILS_ENV") { "development" }
-
-# Specifies the `pidfile` that Puma will use.
-pidfile ENV.fetch("PIDFILE") { "tmp/pids/server.pid" }
-
-# Specifies the number of `workers` to boot in clustered mode.
-# Workers are forked web server processes. If using threads and workers together
-# the concurrency of the application would be max `threads` * `workers`.
-# Workers do not work on JRuby or Windows (both of which do not support
-# processes).
-#
-# workers ENV.fetch("WEB_CONCURRENCY") { 2 }
-
-# Use the `preload_app!` method when specifying a `workers` number.
-# This directive tells Puma to first boot the application and load code
-# before forking the application. This takes advantage of Copy On Write
-# process behavior so workers use less memory.
-#
-# preload_app!
 
 # Allow puma to be restarted by `bin/rails restart` command.
 plugin :tmp_restart
+
+# Run the Solid Queue supervisor inside of Puma for single-server deployments
+plugin :solid_queue if ENV["SOLID_QUEUE_IN_PUMA"]
+
+# Specify the PID file. Defaults to tmp/pids/server.pid in development.
+# In other environments, only set the PID file if requested.
+pidfile ENV["PIDFILE"] if ENV["PIDFILE"]

config/routes.rb

@@ -15,7 +15,10 @@ Rails.application.routes.draw do
 
   namespace :default do
     resources :units, only: [:index, :destroy] do
-      member { post :import, :export }
+      member {
+        post :import
+        post :export
+      }
       #collection { post :import_all }
     end
   end

db/migrate/20230309185340_create_users.rb

@@ -1,11 +1,11 @@
-class CreateUsers < ActiveRecord::Migration[7.0]
+class CreateUsers < ActiveRecord::Migration[8.1]
   def change
     create_table :users do |t|
       t.string :email, null: false, limit: 64
       t.integer :status, null: false, default: 0
 
-      t.timestamps null: false
+      t.timestamps
     end
-    add_index :users, :email, unique: true
+    add_index :users, :email
   end
 end

db/migrate/20230311220654_add_devise_to_users.rb

@@ -1,4 +1,4 @@
-class AddDeviseToUsers < ActiveRecord::Migration[7.0]
+class AddDeviseToUsers < ActiveRecord::Migration[8.1]
   def change
     change_table :users do |t|
       ## NOTE: commented fields left for reference/inclusion in future migrations
@@ -34,8 +34,8 @@ class AddDeviseToUsers < ActiveRecord::Migration[7.0]
       # t.integer :failed_attempts, default: 0, null: false 
     end
 
-    add_index :users, :reset_password_token, unique: true
+    add_index :users, :reset_password_token
-    add_index :users, :confirmation_token, unique: true
+    add_index :users, :confirmation_token
     # add_index :users, :unlock_token, unique: true
   end
 end