diff --git a/Gemfile.lock b/Gemfile.lock
index eadd3a3..8d9c47b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -143,7 +143,7 @@ GEM
     jbuilder (2.13.0)
       actionview (>= 5.0.0)
       activesupport (>= 5.0.0)
-    json (2.8.2)
+    json (2.9.1)
     json-schema (5.0.1)
       addressable (~> 2.8)
     jsonapi-deserializable (0.2.0)
@@ -176,7 +176,7 @@ GEM
       tomlrb (>= 1.3, < 2.1)
       with_env (= 1.1.0)
       xml-simple (~> 1.1.9)
-    logger (1.6.4)
+    logger (1.6.5)
     loofah (2.23.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -290,7 +290,7 @@ GEM
       redis-client (>= 0.22.0)
     redis-client (0.22.2)
       connection_pool
-    regexp_parser (2.9.3)
+    regexp_parser (2.10.0)
     reline (0.6.0)
       io-console (~> 0.5)
     responders (3.1.1)
@@ -329,7 +329,7 @@ GEM
     rswag-ui (2.16.0)
       actionpack (>= 5.2, < 8.1)
       railties (>= 5.2, < 8.1)
-    rubocop (1.69.2)
+    rubocop (1.70.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -339,7 +339,7 @@ GEM
       rubocop-ast (>= 1.36.2, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.36.2)
+    rubocop-ast (1.37.0)
       parser (>= 3.3.1.0)
     rubocop-factory_bot (2.26.1)
       rubocop (~> 1.61)
@@ -354,8 +354,8 @@ GEM
       rubocop (~> 1.61)
       rubocop-rspec (~> 3, >= 3.0.1)
     ruby-progressbar (1.13.0)
-    rubytree (2.1.0)
-      json (~> 2.0, > 2.3.1)
+    rubytree (2.1.1)
+      json (~> 2.0, > 2.9)
     rubyzip (2.3.2)
     securerandom (0.4.1)
     shoulda-matchers (6.4.0)
@@ -504,7 +504,7 @@ CHECKSUMS
   io-console (0.8.0) sha256=cd6a9facbc69871d69b2cb8b926fc6ea7ef06f06e505e81a64f14a470fddefa2
   irb (1.14.3) sha256=c457f1f2f1438ae9ce5c5be3981ae2138dec7fb894c7d73777eeeb0a6c0d0752
   jbuilder (2.13.0) sha256=7200a38a1c0081aa81b7a9757e7a299db75bc58cf1fd45ca7919a91627d227d6
-  json (2.8.2) sha256=dd4fa6c9c81daecf72b86ea36e56ed8955fdbb4d4dc379c93d313a59344486cf
+  json (2.9.1) sha256=d2bdef4644052fad91c1785d48263756fe32fcac08b96a20bb15840e96550d11
   json-schema (5.0.1) sha256=bef71a82c600a42594911553522e143f7634affc198ed507ef3ded2f920a74a9
   jsonapi-deserializable (0.2.0) sha256=5f0ca2d3f8404cce1584a314e8a3753be32a56054c942adfe997b87e92bce147
   jsonapi-parser (0.1.1) sha256=9ee0dc031e88fc7548d56fab66f9716d1e1c06f972b529b8c4617bc42a097020
@@ -517,7 +517,7 @@ CHECKSUMS
   letter_opener (1.10.0) sha256=2ff33f2e3b5c3c26d1959be54b395c086ca6d44826e8bf41a14ff96fdf1bdbb2
   letter_opener_web (3.0.0) sha256=3f391efe0e8b9b24becfab5537dfb17a5cf5eb532038f947daab58cb4b749860
   license_finder (7.2.1) sha256=179ead19b64b170638b72fd16024233813673ac9d20d5ba75ae0b4444887ef14
-  logger (1.6.4) sha256=b627b91c922231050932e7bf8ee886fe54790ba2238a468ead52ba21911f2ee7
+  logger (1.6.5) sha256=c3cfe56d01656490ddd103d38b8993d73d86296adebc5f58cefc9ec03741e56b
   loofah (2.23.1) sha256=d0a07422cb3b69272e124afa914ef6d517e30d5496b7f1c1fc5b95481f13f75e
   mail (2.8.1) sha256=ec3b9fadcf2b3755c78785cb17bc9a0ca9ee9857108a64b6f5cfc9c0b5bfc9ad
   marcel (1.0.4) sha256=0d5649feb64b8f19f3d3468b96c680bae9746335d02194270287868a661516a4
@@ -565,7 +565,7 @@ CHECKSUMS
   react-rails (3.2.1) sha256=2235db0b240517596b1cb3e26177ab5bc64d3a56579b0415ee242b1691f81f64
   redis (5.3.0) sha256=6bf810c5ae889187f0c45f77db503310980310afa57cf1640d57f419ccda72b1
   redis-client (0.22.2) sha256=31fee4b7cf04109b227327fabeaaf1fc5b652cf48a186a03bc607e40767bacc0
-  regexp_parser (2.9.3) sha256=4b620657ed8349d82e1331a076415c79b9dd714a5546162ddd790ea9988f6379
+  regexp_parser (2.10.0) sha256=cb6f0ddde88772cd64bff1dbbf68df66d376043fe2e66a9ef77fcb1b0c548c61
   reline (0.6.0) sha256=57620375dcbe56ec09bac7192bfb7460c716bbf0054dc94345ecaa5438e539d2
   responders (3.1.1) sha256=92f2a87e09028347368639cfb468f5fefa745cb0dc2377ef060db1cdd79a341a
   rexml (3.3.9) sha256=d71875b85299f341edf47d44df0212e7658cbdf35aeb69cefdb63f57af3137c9
@@ -578,14 +578,14 @@ CHECKSUMS
   rswag-api (2.16.0) sha256=b653f7bd92e98be18b01ab4525d88950d7b0960e293a99f856b9efcee3ae6074
   rswag-specs (2.16.0) sha256=8ba26085c408b0bd2ed21dc8015c80f417c7d34c63720ab7133c2549b5bd2a91
   rswag-ui (2.16.0) sha256=a1f49e927dceda92e6e6e7c1000f1e217ee66c565f69e28131dc98b33cd3a04f
-  rubocop (1.69.2) sha256=762fb0f30a379bf6054588d39f1815a2a1df8f067bc0337d3fe500e346924bb8
-  rubocop-ast (1.36.2) sha256=566405b7f983eb9aa3b91d28aca6bc6566e356a97f59e89851dd910aef1dd1ca
+  rubocop (1.70.0) sha256=96751f8440b36a0ac6e9a8ab596900803118d83d6b83f2037bf8b3d7a5bc440e
+  rubocop-ast (1.37.0) sha256=9513ac88aaf113d04b52912533ffe46475de1362d4aa41141b51b2455827c080
   rubocop-factory_bot (2.26.1) sha256=8de13cd4edcee5ca800f255188167ecef8dbfc3d1fae9f15734e9d2e755392aa
   rubocop-rails (2.28.0) sha256=4967bed9ea13e6dcab566fea4265a6dd0381db739b305e48930aba1282da2715
   rubocop-rspec (3.3.0) sha256=79e1b281a689044d1516fefbc52e2e6c06cd367c25ebeaf06a7a198e9071cd7d
   rubocop-rspec_rails (2.30.0) sha256=888112e83f9d7ef7ad2397e9d69a0b9614a4bae24f072c399804a180f80c4c46
   ruby-progressbar (1.13.0) sha256=80fc9c47a9b640d6834e0dc7b3c94c9df37f08cb072b7761e4a71e22cff29b33
-  rubytree (2.1.0) sha256=30e8759ba060dff0dabf7e40cbaaa4df892fa34cbe9f1b3fbb00e83a3f321e4b
+  rubytree (2.1.1) sha256=4925016356a81730e982f1f8c3b5f8da461f18906c77d238bad4c4ba896abd41
   rubyzip (2.3.2) sha256=3f57e3935dc2255c414484fbf8d673b4909d8a6a57007ed754dde39342d2373f
   securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
   shoulda-matchers (6.4.0) sha256=9055bb7f4bb342125fb860809798855c630e05ef5e75837b3168b8e6ee1608b0
diff --git a/app/channels/application_cable/channel.rb b/app/channels/application_cable/channel.rb
index 72b2bf5..716be35 100644
--- a/app/channels/application_cable/channel.rb
+++ b/app/channels/application_cable/channel.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module ApplicationCable
diff --git a/app/channels/application_cable/connection.rb b/app/channels/application_cable/connection.rb
index d45ff4d..286b699 100644
--- a/app/channels/application_cable/connection.rb
+++ b/app/channels/application_cable/connection.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module ApplicationCable
diff --git a/app/controllers/affinities_controller.rb b/app/controllers/affinities_controller.rb
index f8b7052..7d63e9e 100644
--- a/app/controllers/affinities_controller.rb
+++ b/app/controllers/affinities_controller.rb
@@ -1,18 +1,20 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class AffinitiesController < ApplicationController
-  before_action :set_group
+  before_action :set_group, except: :reset
 
   def index
     overridden = @group.affinities.each_with_object({}) do |affinity, acc|
       acc[affinity.another_group(@group).id] = affinity.discomfort
     end
-    Group.where.not(id: @group.id)
-         .pluck(:id)
-         .index_with { |group_id| GroupAffinity::MAX_DISCOMFORT - (overridden[group_id] || GroupAffinity::NEUTRAL) }
-         .then { |affinities| render json: affinities }
+
+    for_each_group do |group_id|
+      overridden[group_id] || GroupAffinity::NEUTRAL
+    end
   end
 
   def bulk_update
@@ -33,8 +35,35 @@ class AffinitiesController < ApplicationController
     render json: { error: 'Invalid group ID or discomfort provided.' }, status: :bad_request
   end
 
+  def default
+    for_each_group do |group_id|
+      Tables::DiscomfortCalculator.cohesion_discomfort(id_a: @group.id, id_b: group_id).to_f
+    end
+  end
+
+  def reset
+    affinities = Group.pluck(:id).combination(2).map do |(group_a_id, group_b_id)|
+      {
+        group_a_id:,
+        group_b_id:,
+        discomfort: Tables::DiscomfortCalculator.cohesion_discomfort(id_a: group_a_id, id_b: group_b_id).to_f
+      }
+    end
+
+    GroupAffinity.upsert_all(affinities)
+
+    render json: {}, status: :ok
+  end
+
   private
 
+  def for_each_group
+    Group.where.not(id: @group.id)
+         .pluck(:id)
+         .index_with { |group_id| GroupAffinity::MAX_DISCOMFORT - yield(group_id) }
+         .then { |affinities| render json: affinities }
+  end
+
   def set_group
     @group = Group.find(params[:group_id])
   end
diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index b1baa15..a73aa87 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class ApplicationController < ActionController::Base
diff --git a/app/controllers/captcha_controller.rb b/app/controllers/captcha_controller.rb
index 57dac61..98fcbcb 100644
--- a/app/controllers/captcha_controller.rb
+++ b/app/controllers/captcha_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class CaptchaController < ApplicationController
diff --git a/app/controllers/expenses_controller.rb b/app/controllers/expenses_controller.rb
index 6e1b63b..093d691 100644
--- a/app/controllers/expenses_controller.rb
+++ b/app/controllers/expenses_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class ExpensesController < ApplicationController
diff --git a/app/controllers/groups_controller.rb b/app/controllers/groups_controller.rb
index 77a347f..8baa833 100644
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class GroupsController < ApplicationController
diff --git a/app/controllers/guests_controller.rb b/app/controllers/guests_controller.rb
index e7f9ff0..7aee16d 100644
--- a/app/controllers/guests_controller.rb
+++ b/app/controllers/guests_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'csv'
diff --git a/app/controllers/summary_controller.rb b/app/controllers/summary_controller.rb
index e165127..9481a47 100644
--- a/app/controllers/summary_controller.rb
+++ b/app/controllers/summary_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class SummaryController < ApplicationController
diff --git a/app/controllers/tables_arrangements_controller.rb b/app/controllers/tables_arrangements_controller.rb
index 23b99ba..76a6774 100644
--- a/app/controllers/tables_arrangements_controller.rb
+++ b/app/controllers/tables_arrangements_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class TablesArrangementsController < ApplicationController
diff --git a/app/controllers/tokens_controller.rb b/app/controllers/tokens_controller.rb
index 5a8490d..4b71df3 100644
--- a/app/controllers/tokens_controller.rb
+++ b/app/controllers/tokens_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class TokensController < ApplicationController
diff --git a/app/controllers/users/confirmations_controller.rb b/app/controllers/users/confirmations_controller.rb
index 7e5c048..c078a1a 100644
--- a/app/controllers/users/confirmations_controller.rb
+++ b/app/controllers/users/confirmations_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Users
diff --git a/app/controllers/users/registrations_controller.rb b/app/controllers/users/registrations_controller.rb
index 0849d96..2a25268 100644
--- a/app/controllers/users/registrations_controller.rb
+++ b/app/controllers/users/registrations_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Users
diff --git a/app/controllers/users/sessions_controller.rb b/app/controllers/users/sessions_controller.rb
index 5e3ad06..8464417 100644
--- a/app/controllers/users/sessions_controller.rb
+++ b/app/controllers/users/sessions_controller.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Users
diff --git a/app/extensions/tree_node_extension.rb b/app/extensions/tree_node_extension.rb
index 9bd1ed4..443c658 100644
--- a/app/extensions/tree_node_extension.rb
+++ b/app/extensions/tree_node_extension.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module TreeNodeExtension
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 1bc40d8..d0c1baa 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module ApplicationHelper
diff --git a/app/helpers/expenses_helper.rb b/app/helpers/expenses_helper.rb
index 287c70f..05513f7 100644
--- a/app/helpers/expenses_helper.rb
+++ b/app/helpers/expenses_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module ExpensesHelper
diff --git a/app/helpers/groups_helper.rb b/app/helpers/groups_helper.rb
index b0492f2..85d797b 100644
--- a/app/helpers/groups_helper.rb
+++ b/app/helpers/groups_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module GroupsHelper
diff --git a/app/helpers/guests_helper.rb b/app/helpers/guests_helper.rb
index 849ddb8..639cf38 100644
--- a/app/helpers/guests_helper.rb
+++ b/app/helpers/guests_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module GuestsHelper
diff --git a/app/helpers/tables_arrangements_helper.rb b/app/helpers/tables_arrangements_helper.rb
index bd95809..a039c6e 100644
--- a/app/helpers/tables_arrangements_helper.rb
+++ b/app/helpers/tables_arrangements_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module TablesArrangementsHelper
diff --git a/app/jobs/application_job.rb b/app/jobs/application_job.rb
index 02ef80e..62fb66f 100644
--- a/app/jobs/application_job.rb
+++ b/app/jobs/application_job.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class ApplicationJob < ActiveJob::Base
diff --git a/app/jobs/table_simulator_job.rb b/app/jobs/table_simulator_job.rb
index 50fe728..56a59d0 100644
--- a/app/jobs/table_simulator_job.rb
+++ b/app/jobs/table_simulator_job.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class TableSimulatorJob < ApplicationJob
diff --git a/app/mailers/application_mailer.rb b/app/mailers/application_mailer.rb
index b168ff3..706222d 100644
--- a/app/mailers/application_mailer.rb
+++ b/app/mailers/application_mailer.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class ApplicationMailer < ActionMailer::Base
diff --git a/app/models/application_record.rb b/app/models/application_record.rb
index 1a28db5..d6fee04 100644
--- a/app/models/application_record.rb
+++ b/app/models/application_record.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class ApplicationRecord < ActiveRecord::Base
diff --git a/app/models/expense.rb b/app/models/expense.rb
index a34cfc5..f810d1c 100644
--- a/app/models/expense.rb
+++ b/app/models/expense.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/group.rb b/app/models/group.rb
index ddf6e52..92d88a6 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/group_affinity.rb b/app/models/group_affinity.rb
index 1e85485..b94e0c5 100644
--- a/app/models/group_affinity.rb
+++ b/app/models/group_affinity.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/guest.rb b/app/models/guest.rb
index 8687767..c9eb0b0 100644
--- a/app/models/guest.rb
+++ b/app/models/guest.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/seat.rb b/app/models/seat.rb
index a00ec99..71e9d77 100644
--- a/app/models/seat.rb
+++ b/app/models/seat.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/tables_arrangement.rb b/app/models/tables_arrangement.rb
index 72f13d5..3e6aef9 100644
--- a/app/models/tables_arrangement.rb
+++ b/app/models/tables_arrangement.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/user.rb b/app/models/user.rb
index 5a9683e..d263c97 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/models/wedding.rb b/app/models/wedding.rb
index c94d83d..4368c50 100644
--- a/app/models/wedding.rb
+++ b/app/models/wedding.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # == Schema Information
diff --git a/app/queries/expenses/total_query.rb b/app/queries/expenses/total_query.rb
index fc46a6b..0ba9f5f 100644
--- a/app/queries/expenses/total_query.rb
+++ b/app/queries/expenses/total_query.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Expenses
diff --git a/app/queries/groups/summary_query.rb b/app/queries/groups/summary_query.rb
index 28fe6a5..e1b7138 100644
--- a/app/queries/groups/summary_query.rb
+++ b/app/queries/groups/summary_query.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Groups
diff --git a/app/serializers/serializable_group.rb b/app/serializers/serializable_group.rb
index eb30b10..4572c78 100644
--- a/app/serializers/serializable_group.rb
+++ b/app/serializers/serializable_group.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class SerializableGroup < JSONAPI::Serializable::Resource
diff --git a/app/serializers/serializable_guest.rb b/app/serializers/serializable_guest.rb
index 981e58b..3e95236 100644
--- a/app/serializers/serializable_guest.rb
+++ b/app/serializers/serializable_guest.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class SerializableGuest < JSONAPI::Serializable::Resource
diff --git a/app/services/affinity_groups_hierarchy.rb b/app/services/affinity_groups_hierarchy.rb
index 310bac8..783c7ed 100644
--- a/app/services/affinity_groups_hierarchy.rb
+++ b/app/services/affinity_groups_hierarchy.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class AffinityGroupsHierarchy < Array
diff --git a/app/services/libre_captcha.rb b/app/services/libre_captcha.rb
index 314c186..d644ba2 100644
--- a/app/services/libre_captcha.rb
+++ b/app/services/libre_captcha.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class LibreCaptcha
diff --git a/app/services/tables/discomfort_calculator.rb b/app/services/tables/discomfort_calculator.rb
index 48dacce..bd35087 100644
--- a/app/services/tables/discomfort_calculator.rb
+++ b/app/services/tables/discomfort_calculator.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Tables
diff --git a/app/services/tables/distribution.rb b/app/services/tables/distribution.rb
index 04d1e6a..7b4762f 100644
--- a/app/services/tables/distribution.rb
+++ b/app/services/tables/distribution.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require_relative '../../extensions/tree_node_extension'
diff --git a/app/services/tables/shift.rb b/app/services/tables/shift.rb
index 2326b1e..45e7150 100644
--- a/app/services/tables/shift.rb
+++ b/app/services/tables/shift.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Tables
diff --git a/app/services/tables/swap.rb b/app/services/tables/swap.rb
index 1fe6944..230959d 100644
--- a/app/services/tables/swap.rb
+++ b/app/services/tables/swap.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Tables
diff --git a/app/services/tables/table.rb b/app/services/tables/table.rb
index 8877e7c..3628c49 100644
--- a/app/services/tables/table.rb
+++ b/app/services/tables/table.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Tables
diff --git a/app/services/vns/engine.rb b/app/services/vns/engine.rb
index 9f600df..fe1ff91 100644
--- a/app/services/vns/engine.rb
+++ b/app/services/vns/engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module VNS
diff --git a/app/views/layouts/mailer.html.erb b/app/views/layouts/mailer.html.erb
index ca6bd25..4eee621 100644
--- a/app/views/layouts/mailer.html.erb
+++ b/app/views/layouts/mailer.html.erb
@@ -1,5 +1,7 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <!DOCTYPE html>
 <html>
   <head>
diff --git a/app/views/layouts/mailer.text.erb b/app/views/layouts/mailer.text.erb
index 0b40d6b..62b17c3 100644
--- a/app/views/layouts/mailer.text.erb
+++ b/app/views/layouts/mailer.text.erb
@@ -1,3 +1,5 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <%= yield %>
diff --git a/app/views/users/mailer/confirmation_instructions.html.erb b/app/views/users/mailer/confirmation_instructions.html.erb
index 448e3d9..688f1bc 100644
--- a/app/views/users/mailer/confirmation_instructions.html.erb
+++ b/app/views/users/mailer/confirmation_instructions.html.erb
@@ -1,5 +1,7 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <p>Welcome <%= @email %>!</p>
 
 <p>You can confirm your account email through the link below:</p>
diff --git a/app/views/users/mailer/email_changed.html.erb b/app/views/users/mailer/email_changed.html.erb
index 51cfa7a..8935bc0 100644
--- a/app/views/users/mailer/email_changed.html.erb
+++ b/app/views/users/mailer/email_changed.html.erb
@@ -1,5 +1,7 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <p>Hello <%= @email %>!</p>
 
 <% if @resource.try(:unconfirmed_email?) %>
diff --git a/app/views/users/mailer/password_change.html.erb b/app/views/users/mailer/password_change.html.erb
index 7bfd484..3d72a19 100644
--- a/app/views/users/mailer/password_change.html.erb
+++ b/app/views/users/mailer/password_change.html.erb
@@ -1,5 +1,7 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <p>Hello <%= @resource.email %>!</p>
 
 <p>We're contacting you to notify you that your password has been changed.</p>
diff --git a/app/views/users/mailer/reset_password_instructions.html.erb b/app/views/users/mailer/reset_password_instructions.html.erb
index 3bc6fcd..fc45ec9 100644
--- a/app/views/users/mailer/reset_password_instructions.html.erb
+++ b/app/views/users/mailer/reset_password_instructions.html.erb
@@ -1,5 +1,7 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <p>Hello <%= @resource.email %>!</p>
 
 <p>Someone has requested a link to change your password. You can do this through the link below.</p>
diff --git a/app/views/users/mailer/unlock_instructions.html.erb b/app/views/users/mailer/unlock_instructions.html.erb
index 6df5c0a..fddd365 100644
--- a/app/views/users/mailer/unlock_instructions.html.erb
+++ b/app/views/users/mailer/unlock_instructions.html.erb
@@ -1,5 +1,7 @@
 <%# Copyright (C) 2024 Manuel Bustillo %>
 
+<%# Copyright (C) 2024-2025 LibreWeddingPlanner contributors %>
+
 <p>Hello <%= @resource.email %>!</p>
 
 <p>Your account has been locked due to an excessive number of unsuccessful sign in attempts.</p>
diff --git a/config/application.rb b/config/application.rb
index 8233705..32fbf95 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 require_relative 'boot'
 
 require 'rails'
diff --git a/config/boot.rb b/config/boot.rb
index b7afb85..59676bc 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 require "bundler/setup" # Set up gems listed in the Gemfile.
diff --git a/config/environment.rb b/config/environment.rb
index 6cec499..df4bf2e 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Load the Rails application.
 require_relative "application"
 
diff --git a/config/environments/development.rb b/config/environments/development.rb
index b3b6593..b0f2198 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 2a94187..59e22d6 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
diff --git a/config/environments/test.rb b/config/environments/test.rb
index ef2b3a4..28b85d7 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 require "active_support/core_ext/integer/time"
 
 # The test environment is used exclusively to run your application's
diff --git a/config/importmap.rb b/config/importmap.rb
index f84aa44..19991f1 100644
--- a/config/importmap.rb
+++ b/config/importmap.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Pin npm packages by running ./bin/importmap
 
 pin "application"
diff --git a/config/initializers/acts_as_tenant.rb b/config/initializers/acts_as_tenant.rb
index c535737..72510c4 100644
--- a/config/initializers/acts_as_tenant.rb
+++ b/config/initializers/acts_as_tenant.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 ActsAsTenant.configure do |config|
   config.require_tenant = !Rails.env.test?
 end
\ No newline at end of file
diff --git a/config/initializers/assets.rb b/config/initializers/assets.rb
index f67fe73..8e722ce 100644
--- a/config/initializers/assets.rb
+++ b/config/initializers/assets.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Be sure to restart your server when you modify this file.
 
 # Version of your assets, change this if you want to expire all your assets.
diff --git a/config/initializers/colors.rb b/config/initializers/colors.rb
index b435084..f1bbdd2 100644
--- a/config/initializers/colors.rb
+++ b/config/initializers/colors.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 Chroma.define_palette :decreasing_saturation do
   spin(20).desaturate(40)
   spin(-20).desaturate(40)
diff --git a/config/initializers/content_security_policy.rb b/config/initializers/content_security_policy.rb
index 9004631..3f9221f 100644
--- a/config/initializers/content_security_policy.rb
+++ b/config/initializers/content_security_policy.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Be sure to restart your server when you modify this file.
 
 # Define an application-wide content security policy.
diff --git a/config/initializers/cors.rb b/config/initializers/cors.rb
index f4b450f..565fe09 100644
--- a/config/initializers/cors.rb
+++ b/config/initializers/cors.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # config/initializers/cors.rb
 
 Rails.application.config.middleware.insert_before 0, Rack::Cors do
diff --git a/config/initializers/devise.rb b/config/initializers/devise.rb
index 5f631ef..0ecbf5e 100644
--- a/config/initializers/devise.rb
+++ b/config/initializers/devise.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # Assuming you have not yet modified this file, each configuration option below
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index b5bfef2..e184d9a 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Be sure to restart your server when you modify this file.
 
 # Configure parameters to be partially matched (e.g. passw matches password) and filtered from the log file.
diff --git a/config/initializers/inflections.rb b/config/initializers/inflections.rb
index 6633bb9..0f9a0ea 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
diff --git a/config/initializers/permissions_policy.rb b/config/initializers/permissions_policy.rb
index 57547a3..af956f8 100644
--- a/config/initializers/permissions_policy.rb
+++ b/config/initializers/permissions_policy.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # Be sure to restart your server when you modify this file.
 
 # Define an application-wide HTTP permissions policy. For further
diff --git a/config/initializers/rswag_api.rb b/config/initializers/rswag_api.rb
index 5c46141..4c11988 100644
--- a/config/initializers/rswag_api.rb
+++ b/config/initializers/rswag_api.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 Rswag::Api.configure do |c|
 
   # Specify a root folder where Swagger JSON files are located
diff --git a/config/initializers/rswag_ui.rb b/config/initializers/rswag_ui.rb
index 9540ca4..dec08ce 100644
--- a/config/initializers/rswag_ui.rb
+++ b/config/initializers/rswag_ui.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 Rswag::Ui.configure do |c|
 
   # List the Swagger endpoints that you want to be documented through the
diff --git a/config/initializers/ruby_extensions.rb b/config/initializers/ruby_extensions.rb
index 46016e7..9fb7af1 100644
--- a/config/initializers/ruby_extensions.rb
+++ b/config/initializers/ruby_extensions.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class Numeric
   def to_currency
     Money.from_amount(self, "EUR").format
diff --git a/config/puma.rb b/config/puma.rb
index 0e947b4..3d8dbc2 100644
--- a/config/puma.rb
+++ b/config/puma.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # This configuration file will be evaluated by Puma. The top-level methods that
 # are invoked here are part of Puma's configuration DSL. For more information
 # about methods provided by the DSL, see https://puma.io/puma/Puma/DSL.html.
diff --git a/config/routes.rb b/config/routes.rb
index 9e2b004..457503d 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 Rails.application.routes.draw do
   mount LetterOpenerWeb::Engine, at: "/letter_opener" if Rails.env.development?
   get 'token' => 'tokens#show', as: :token
@@ -24,8 +26,10 @@ Rails.application.routes.draw do
     end
 
     resources :groups, only: %i[index create update destroy] do
+      post 'affinities/reset', to: 'affinities#reset', on: :collection
       resources :affinities, only: %i[index] do
         put :bulk_update, on: :collection
+        get :default, on: :collection
       end
     end
 
diff --git a/db/migrate/20240711175425_create_expenses.rb b/db/migrate/20240711175425_create_expenses.rb
index cdac7d0..1538790 100644
--- a/db/migrate/20240711175425_create_expenses.rb
+++ b/db/migrate/20240711175425_create_expenses.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateExpenses < ActiveRecord::Migration[7.1]
   def change
     create_enum :pricing_types, ["fixed", "per_person"]
diff --git a/db/migrate/20240711180753_create_guests.rb b/db/migrate/20240711180753_create_guests.rb
index ca3f85b..6597d34 100644
--- a/db/migrate/20240711180753_create_guests.rb
+++ b/db/migrate/20240711180753_create_guests.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateGuests < ActiveRecord::Migration[7.1]
   def change
     create_table :guests, id: :uuid do |t|
diff --git a/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb b/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb
index 803f800..a614c83 100644
--- a/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181626_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 1)
diff --git a/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb b/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb
index 7fe34a2..ab62f5f 100644
--- a/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181627_add_missing_unique_indices.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 2)
diff --git a/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb b/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
index a329d5d..1d9f0e9 100644
--- a/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181628_add_taggings_counter_cache_to_tags.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 3)
diff --git a/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb b/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb
index 4548054..0d79854 100644
--- a/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181629_add_missing_taggable_index.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 4)
diff --git a/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb b/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
index d0ff9c4..e643bb4 100644
--- a/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181630_change_collation_for_tag_names.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 5)
diff --git a/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb b/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb
index 194dea4..fa60128 100644
--- a/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181631_add_missing_indexes_on_taggings.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 6)
diff --git a/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb b/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb
index 23cb9f8..fa8df4d 100644
--- a/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb
+++ b/db/migrate/20240711181632_add_tenant_to_taggings.acts_as_taggable_on_engine.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This migration comes from acts_as_taggable_on_engine (originally 7)
diff --git a/db/migrate/20240724181756_create_tables_arrangements.rb b/db/migrate/20240724181756_create_tables_arrangements.rb
index ac69487..ed278c8 100644
--- a/db/migrate/20240724181756_create_tables_arrangements.rb
+++ b/db/migrate/20240724181756_create_tables_arrangements.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateTablesArrangements < ActiveRecord::Migration[7.1]
   def change
     create_table :tables_arrangements, id: :uuid do |t|
diff --git a/db/migrate/20240724181853_create_seats.rb b/db/migrate/20240724181853_create_seats.rb
index b28c9d0..462df84 100644
--- a/db/migrate/20240724181853_create_seats.rb
+++ b/db/migrate/20240724181853_create_seats.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateSeats < ActiveRecord::Migration[7.1]
   def change
     create_table :seats, id: :uuid do |t|
diff --git a/db/migrate/20240811142121_create_groups.rb b/db/migrate/20240811142121_create_groups.rb
index b21f067..8380c36 100644
--- a/db/migrate/20240811142121_create_groups.rb
+++ b/db/migrate/20240811142121_create_groups.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateGroups < ActiveRecord::Migration[7.1]
   def change
     create_table :groups, id: :uuid do |t|
diff --git a/db/migrate/20240811143801_add_parent_to_group.rb b/db/migrate/20240811143801_add_parent_to_group.rb
index c8a3a14..fc4a881 100644
--- a/db/migrate/20240811143801_add_parent_to_group.rb
+++ b/db/migrate/20240811143801_add_parent_to_group.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AddParentToGroup < ActiveRecord::Migration[7.1]
   def change
     add_reference :groups, :parent, type: :uuid, index: true, foreign_key: { to_table: :groups }
diff --git a/db/migrate/20240811154115_add_group_to_guest.rb b/db/migrate/20240811154115_add_group_to_guest.rb
index f1fcdaf..ff88298 100644
--- a/db/migrate/20240811154115_add_group_to_guest.rb
+++ b/db/migrate/20240811154115_add_group_to_guest.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AddGroupToGuest < ActiveRecord::Migration[7.1]
   def change
     add_reference :guests, :group, null: false, foreign_key: true, type: :uuid
diff --git a/db/migrate/20240811170021_add_status_to_guest.rb b/db/migrate/20240811170021_add_status_to_guest.rb
index de51170..09a2a9e 100644
--- a/db/migrate/20240811170021_add_status_to_guest.rb
+++ b/db/migrate/20240811170021_add_status_to_guest.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AddStatusToGuest < ActiveRecord::Migration[7.1]
   def change
     add_column :guests, :status, :integer, default: 0
diff --git a/db/migrate/20241101181052_drop_taggable_tables.rb b/db/migrate/20241101181052_drop_taggable_tables.rb
index cce88c7..6787951 100644
--- a/db/migrate/20241101181052_drop_taggable_tables.rb
+++ b/db/migrate/20241101181052_drop_taggable_tables.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class DropTaggableTables < ActiveRecord::Migration[7.2]
   def change
     drop_table 'taggings', force: :cascade do |t|
diff --git a/db/migrate/20241103072808_add_name_to_tables_arrangements.rb b/db/migrate/20241103072808_add_name_to_tables_arrangements.rb
index 53dd4fa..3bd57a2 100644
--- a/db/migrate/20241103072808_add_name_to_tables_arrangements.rb
+++ b/db/migrate/20241103072808_add_name_to_tables_arrangements.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AddNameToTablesArrangements < ActiveRecord::Migration[7.2]
   def change
     add_column :tables_arrangements, :name, :string, null: false
diff --git a/db/migrate/20241103075705_solid_queue_install.rb b/db/migrate/20241103075705_solid_queue_install.rb
index 3a0b744..ca9e45e 100644
--- a/db/migrate/20241103075705_solid_queue_install.rb
+++ b/db/migrate/20241103075705_solid_queue_install.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class SolidQueueInstall < ActiveRecord::Migration[7.2]
   def change
     create_table 'solid_queue_blocked_executions', force: :cascade do |t|
diff --git a/db/migrate/20241103093955_remove_email_from_guests.rb b/db/migrate/20241103093955_remove_email_from_guests.rb
index 26ca939..a6f9798 100644
--- a/db/migrate/20241103093955_remove_email_from_guests.rb
+++ b/db/migrate/20241103093955_remove_email_from_guests.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class RemoveEmailFromGuests < ActiveRecord::Migration[7.2]
   def change
     remove_column :guests, :email, :string
diff --git a/db/migrate/20241103133122_add_color_to_group.rb b/db/migrate/20241103133122_add_color_to_group.rb
index bca1c30..30218e3 100644
--- a/db/migrate/20241103133122_add_color_to_group.rb
+++ b/db/migrate/20241103133122_add_color_to_group.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AddColorToGroup < ActiveRecord::Migration[7.2]
   def change
     add_column :groups, :color, :string
diff --git a/db/migrate/20241111063741_merge_guest_names.rb b/db/migrate/20241111063741_merge_guest_names.rb
index 849f58f..90d5e82 100644
--- a/db/migrate/20241111063741_merge_guest_names.rb
+++ b/db/migrate/20241111063741_merge_guest_names.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class MergeGuestNames < ActiveRecord::Migration[8.0]
   def change
     add_column :guests, :name, :string
diff --git a/db/migrate/20241130095753_devise_create_users.rb b/db/migrate/20241130095753_devise_create_users.rb
index 977c72e..496e3fc 100644
--- a/db/migrate/20241130095753_devise_create_users.rb
+++ b/db/migrate/20241130095753_devise_create_users.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 class DeviseCreateUsers < ActiveRecord::Migration[8.0]
diff --git a/db/migrate/20241130182228_create_weddings.rb b/db/migrate/20241130182228_create_weddings.rb
index 2151f72..77ada38 100644
--- a/db/migrate/20241130182228_create_weddings.rb
+++ b/db/migrate/20241130182228_create_weddings.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateWeddings < ActiveRecord::Migration[8.0]
   def change
     create_table :weddings, id: :uuid do |t|
diff --git a/db/migrate/20241130185731_add_wedding_id_to_models.rb b/db/migrate/20241130185731_add_wedding_id_to_models.rb
index 63e5c32..c9b231c 100644
--- a/db/migrate/20241130185731_add_wedding_id_to_models.rb
+++ b/db/migrate/20241130185731_add_wedding_id_to_models.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AddWeddingIdToModels < ActiveRecord::Migration[8.0]
   def change
     [:expenses, :guests, :seats, :tables_arrangements, :groups, :users].each do |table|
diff --git a/db/migrate/20241207112305_remove_wedding_date.rb b/db/migrate/20241207112305_remove_wedding_date.rb
index c810ee4..ca28b71 100644
--- a/db/migrate/20241207112305_remove_wedding_date.rb
+++ b/db/migrate/20241207112305_remove_wedding_date.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class RemoveWeddingDate < ActiveRecord::Migration[8.0]
   def change
     remove_column :weddings, :date, :date, null: false
diff --git a/db/migrate/20241208102932_allow_ungrouped_guests.rb b/db/migrate/20241208102932_allow_ungrouped_guests.rb
index c06d40c..f567676 100644
--- a/db/migrate/20241208102932_allow_ungrouped_guests.rb
+++ b/db/migrate/20241208102932_allow_ungrouped_guests.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class AllowUngroupedGuests < ActiveRecord::Migration[8.0]
   def change
     change_column_null :guests, :group_id, true
diff --git a/db/migrate/20241216231415_create_group_affinities.rb b/db/migrate/20241216231415_create_group_affinities.rb
index 2b03897..113d026 100644
--- a/db/migrate/20241216231415_create_group_affinities.rb
+++ b/db/migrate/20241216231415_create_group_affinities.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 class CreateGroupAffinities < ActiveRecord::Migration[8.0]
   disable_ddl_transaction!
 
diff --git a/db/queue_schema.rb b/db/queue_schema.rb
index 24748f4..149f41f 100644
--- a/db/queue_schema.rb
+++ b/db/queue_schema.rb
@@ -1,4 +1,6 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 ActiveRecord::Schema[7.1].define(version: 1) do
   end
diff --git a/db/schema.rb b/db/schema.rb
index f723b74..cfc1383 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # This file is auto-generated from the current state of the database. Instead
 # of editing this file, please use the migrations feature of Active Record to
 # incrementally modify your database, and then regenerate this schema definition.
diff --git a/db/seeds.rb b/db/seeds.rb
index eb45757..e61f33b 100644
--- a/db/seeds.rb
+++ b/db/seeds.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 NUMBER_OF_GUESTS = 50
 
 ActsAsTenant.without_tenant do
diff --git a/spec/extensions/tree_spec.rb b/spec/extensions/tree_spec.rb
index 1d3e6d0..937a0fe 100644
--- a/spec/extensions/tree_spec.rb
+++ b/spec/extensions/tree_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/factories/expense.rb b/spec/factories/expense.rb
index e122a43..ceaf501 100644
--- a/spec/factories/expense.rb
+++ b/spec/factories/expense.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/factories/group_affinities.rb b/spec/factories/group_affinities.rb
index f5f2b65..c33de53 100644
--- a/spec/factories/group_affinities.rb
+++ b/spec/factories/group_affinities.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/factories/groups.rb b/spec/factories/groups.rb
index 84ae9ec..f19ba72 100644
--- a/spec/factories/groups.rb
+++ b/spec/factories/groups.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/factories/guest.rb b/spec/factories/guest.rb
index 25a5c5e..a1f284a 100644
--- a/spec/factories/guest.rb
+++ b/spec/factories/guest.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/factories/table_arrangement.rb b/spec/factories/table_arrangement.rb
index 19c5f14..86ddddf 100644
--- a/spec/factories/table_arrangement.rb
+++ b/spec/factories/table_arrangement.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
index 3616935..cc49d11 100644
--- a/spec/factories/users.rb
+++ b/spec/factories/users.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/factories/weddings.rb b/spec/factories/weddings.rb
index 1e6f555..de994c8 100644
--- a/spec/factories/weddings.rb
+++ b/spec/factories/weddings.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/models/expense_spec.rb b/spec/models/expense_spec.rb
index b002e78..9a8fc47 100644
--- a/spec/models/expense_spec.rb
+++ b/spec/models/expense_spec.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/models/group_affinity_spec.rb b/spec/models/group_affinity_spec.rb
index 9d56d08..5469d27 100644
--- a/spec/models/group_affinity_spec.rb
+++ b/spec/models/group_affinity_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/models/group_spec.rb b/spec/models/group_spec.rb
index f7e7fd3..d7ec456 100644
--- a/spec/models/group_spec.rb
+++ b/spec/models/group_spec.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/models/guest_spec.rb b/spec/models/guest_spec.rb
index a63da70..ed526e8 100644
--- a/spec/models/guest_spec.rb
+++ b/spec/models/guest_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/models/seat_spec.rb b/spec/models/seat_spec.rb
index 40e63f2..da5c17f 100644
--- a/spec/models/seat_spec.rb
+++ b/spec/models/seat_spec.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/models/tables_arrangement_spec.rb b/spec/models/tables_arrangement_spec.rb
index 493318c..b216b18 100644
--- a/spec/models/tables_arrangement_spec.rb
+++ b/spec/models/tables_arrangement_spec.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index ae1be79..9f69608 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/models/wedding_spec.rb b/spec/models/wedding_spec.rb
index 84db4f1..735255d 100644
--- a/spec/models/wedding_spec.rb
+++ b/spec/models/wedding_spec.rb
@@ -1,6 +1,8 @@
 # Copyright (C) 2024 Manuel Bustillo
 
-# Copyright (C) 2024 Manuel Bustillo
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
 
 # frozen_string_literal: true
 
diff --git a/spec/queries/expenses/total_query_spec.rb b/spec/queries/expenses/total_query_spec.rb
index 7847abe..e3f16c4 100644
--- a/spec/queries/expenses/total_query_spec.rb
+++ b/spec/queries/expenses/total_query_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/queries/groups/summary_query_spec.rb b/spec/queries/groups/summary_query_spec.rb
index 1ef1a33..cb3b7fe 100644
--- a/spec/queries/groups/summary_query_spec.rb
+++ b/spec/queries/groups/summary_query_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 7058316..653bbf9 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This file is copied to spec/ when you run 'rails generate rspec:install'
diff --git a/spec/requests/affinities_spec.rb b/spec/requests/affinities_spec.rb
index c964018..3a39c0c 100644
--- a/spec/requests/affinities_spec.rb
+++ b/spec/requests/affinities_spec.rb
@@ -1,10 +1,23 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
 
 RSpec.describe 'affinities' do
+  path '/{slug}/groups/affinities/reset' do
+    parameter Swagger::Schema::SLUG
+
+    post('reset affinities') do
+      tags 'Affinities'
+      description 'Reset all affinities to default values based on the distance between groups in the hierarchy.'
+
+      response_empty200
+    end
+  end
+
   path '/{slug}/groups/{group_id}/affinities' do
     parameter Swagger::Schema::SLUG
     parameter name: 'group_id', in: :path, type: :string, format: :uuid, description: 'group_id'
@@ -20,6 +33,21 @@ RSpec.describe 'affinities' do
     end
   end
 
+  path '/{slug}/groups/{group_id}/affinities/default' do
+    parameter Swagger::Schema::SLUG
+    parameter name: 'group_id', in: :path, type: :string, format: :uuid, description: 'group_id'
+
+    get('calculate default affinity') do
+      tags 'Affinities'
+      produces 'application/json'
+
+      response(200, 'successful') do
+        schema type: :object, additionalProperties: { type: :integer, minimum: 0, maximum: 2 }
+        xit
+      end
+    end
+  end
+
   path '/{slug}/groups/{group_id}/affinities/bulk_update' do
     parameter Swagger::Schema::SLUG
     parameter name: 'group_id', in: :path, type: :string, format: :uuid, description: 'group_id'
diff --git a/spec/requests/captcha_spec.rb b/spec/requests/captcha_spec.rb
index 17dc9bf..e1f2fea 100644
--- a/spec/requests/captcha_spec.rb
+++ b/spec/requests/captcha_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/expenses_spec.rb b/spec/requests/expenses_spec.rb
index 557f2e3..e6defe4 100644
--- a/spec/requests/expenses_spec.rb
+++ b/spec/requests/expenses_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/groups_spec.rb b/spec/requests/groups_spec.rb
index 30c512e..49d121b 100644
--- a/spec/requests/groups_spec.rb
+++ b/spec/requests/groups_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/guests_spec.rb b/spec/requests/guests_spec.rb
index 1ef80d4..40a6686 100644
--- a/spec/requests/guests_spec.rb
+++ b/spec/requests/guests_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/schemas.rb b/spec/requests/schemas.rb
index ee914b3..3fd49f2 100644
--- a/spec/requests/schemas.rb
+++ b/spec/requests/schemas.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module Swagger
diff --git a/spec/requests/summary_spec.rb b/spec/requests/summary_spec.rb
index f39ab7a..3dc6ac0 100644
--- a/spec/requests/summary_spec.rb
+++ b/spec/requests/summary_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/tables_arrangements_spec.rb b/spec/requests/tables_arrangements_spec.rb
index 34c686f..cf48cac 100644
--- a/spec/requests/tables_arrangements_spec.rb
+++ b/spec/requests/tables_arrangements_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/tokens_spec.rb b/spec/requests/tokens_spec.rb
index 406e041..b5b9cf7 100644
--- a/spec/requests/tokens_spec.rb
+++ b/spec/requests/tokens_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/users/confirmations_spec.rb b/spec/requests/users/confirmations_spec.rb
index 8628683..d76d53a 100644
--- a/spec/requests/users/confirmations_spec.rb
+++ b/spec/requests/users/confirmations_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/users/registrations_spec.rb b/spec/requests/users/registrations_spec.rb
index f1dd82c..064d28e 100644
--- a/spec/requests/users/registrations_spec.rb
+++ b/spec/requests/users/registrations_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/requests/users/sessions_spec.rb b/spec/requests/users/sessions_spec.rb
index 775f56c..61c2662 100644
--- a/spec/requests/users/sessions_spec.rb
+++ b/spec/requests/users/sessions_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'swagger_helper'
diff --git a/spec/services/tables/discomfort_calculator_spec.rb b/spec/services/tables/discomfort_calculator_spec.rb
index 3851bbf..81633d7 100644
--- a/spec/services/tables/discomfort_calculator_spec.rb
+++ b/spec/services/tables/discomfort_calculator_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/services/tables/distribution_spec.rb b/spec/services/tables/distribution_spec.rb
index d22b817..a427f40 100644
--- a/spec/services/tables/distribution_spec.rb
+++ b/spec/services/tables/distribution_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/services/tables/shift_spec.rb b/spec/services/tables/shift_spec.rb
index 590d62b..67a4d5d 100644
--- a/spec/services/tables/shift_spec.rb
+++ b/spec/services/tables/shift_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/services/tables/swap_spec.rb b/spec/services/tables/swap_spec.rb
index 94ccced..ae9e974 100644
--- a/spec/services/tables/swap_spec.rb
+++ b/spec/services/tables/swap_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/services/vns/engine_spec.rb b/spec/services/vns/engine_spec.rb
index e3f379c..c8d489d 100644
--- a/spec/services/vns/engine_spec.rb
+++ b/spec/services/vns/engine_spec.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2aa37f6..f5a5a59 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 # This file was generated by the `rails generate rspec:install` command. Conventionally, all
diff --git a/spec/swagger_helper.rb b/spec/swagger_helper.rb
index 2c53057..bbf6c7f 100644
--- a/spec/swagger_helper.rb
+++ b/spec/swagger_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 require 'rails_helper'
diff --git a/spec/swagger_response_helper.rb b/spec/swagger_response_helper.rb
index b3f3e0b..c13d8a8 100644
--- a/spec/swagger_response_helper.rb
+++ b/spec/swagger_response_helper.rb
@@ -1,5 +1,7 @@
 # Copyright (C) 2024 Manuel Bustillo
 
+# Copyright (C) 2024-2025 LibreWeddingPlanner contributors
+
 # frozen_string_literal: true
 
 module SwaggerResponseHelper