diff --git a/.dockerignore b/.dockerignore
index 6672e96..cee8f5f 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -7,7 +7,6 @@ db/*.sqlite3.*
 docker/**
 .gitignore
 .hound.yml
-.rubocop.yml
 docker-compose.yml
 README.md
 .gitlab-ci.yml
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4db6544..b0c5c3a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -13,6 +13,21 @@ include:
   - project: 'turniere/turniere-infra'
     file: '/ci/pipeline.yaml'
 
+lint:
+  stage: test
+  tags:
+    - docker
+  needs:
+    - job: build_image
+  image: $CI_REGISTRY_IMAGE/test/commits:$CI_COMMIT_SHA
+  rules:
+    - if: $CI_PIPELINE_SOURCE != "push"
+      when: never
+    - when: always
+  script:
+    - cd /app
+    - inv lint
+
 rails spec:
   stage: test
   tags:
diff --git a/.rubocop.yml b/.rubocop.yml
index 5a901d6..8981d87 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,9 +1,3 @@
-inherit_from: .rubocop_todo.yml
-
-inherit_mode:
-  merge:
-    - Exclude
-
 plugins:
   - rubocop-performance
   - rubocop-rails
@@ -15,6 +9,7 @@ AllCops:
   Exclude:
     - "bin/**/*"
     - "db/schema.rb"
+    - "spec/**/*.rb"
 
 # Enable Rails
 Rails:
@@ -22,14 +17,14 @@ Rails:
 
 # Commonly used screens these days easily fit more than 80 characters.
 Layout/LineLength:
-  Max: 120
+  Max: 140
 
 # Too short methods lead to extraction of single-use methods, which can make
 # the code easier to read (by naming things), but can also clutter the class
 Metrics/MethodLength:
   Exclude:
     - "db/migrate/*"
-  Max: 50
+  Max: 60
 
 # The guiding principle of classes is SRP, SRP can't be accurately measured by LoC
 Metrics/ClassLength:
@@ -41,9 +36,10 @@ Metrics/ModuleLength:
 Metrics/AbcSize:
   Exclude:
     - "db/migrate/*"
-  Max: 50
+  Max: 75
 
 Metrics/BlockLength:
+  Max: 30
   AllowedMethods:
     - "namespace"
     - "create_table"
@@ -51,6 +47,42 @@ Metrics/BlockLength:
     - "config/**/*.rb"
     - "spec/**/*.rb"
 
+Metrics/CyclomaticComplexity:
+  Max: 22
+
+Metrics/ParameterLists:
+  Max: 7
+
+Metrics/PerceivedComplexity:
+  Max: 24
+
+Rails/ReversibleMigration:
+  Exclude:
+    - "db/migrate/**/*"
+
+Rails/SkipsModelValidations:
+  Exclude:
+    - "app/models/tournament_sync_queue_entry.rb"
+    - "app/services/tournament_sync_pusher.rb"
+    - "db/migrate/**/*"
+
+# These are standalone CLI entrypoints where stdout is command output,
+# not Rails application logging.
+Rails/Output:
+  Exclude:
+    - "e2e/load_test.rb"
+    - "script/e2e_scenarios.rb"
+    - "script/wait_for_http.rb"
+
+Rails/Delegate:
+  Exclude:
+    - "app/controllers/tournaments_controller.rb"
+    - "e2e/lib/action_cable_client.rb"
+
+Style/MultilineBlockChain:
+  Exclude:
+    - "e2e/lib/api_client.rb"
+
 # Disable documentation checks for now
 # should be done with yard instead
 Style/Documentation:
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
deleted file mode 100644
index de039d0..0000000
--- a/.rubocop_todo.yml
+++ /dev/null
@@ -1,563 +0,0 @@
-# This configuration was generated by
-# `rubocop --auto-gen-config --no-exclude-limit`
-# on 2026-04-28 09:58:15 UTC using RuboCop version 1.86.1.
-# The point is for the user to remove these configuration records
-# one by one as the offenses are removed from the code base.
-# Note that changes in the inspected code, or installation of new
-# versions of RuboCop, may require this file to be generated again.
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: TreatCommentsAsGroupSeparators, ConsiderPunctuation.
-Bundler/OrderedGems:
-  Exclude:
-    - 'Gemfile'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyleAlignWith.
-# SupportedStylesAlignWith: either, start_of_block, start_of_line
-Layout/BlockAlignment:
-  Exclude:
-    - 'spec/routing/tournaments_routing_spec.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowForAlignment.
-Layout/CommentIndentation:
-  Exclude:
-    - 'app/serializers/tournament_serializer.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-Layout/EmptyLineAfterGuardClause:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-    - 'config/spring.rb'
-    - 'spec/factories/tournaments.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EmptyLineBetweenMethodDefs, EmptyLineBetweenClassDefs, EmptyLineBetweenModuleDefs, DefLikeMacros, AllowAdjacentOneLineDefs, NumberOfEmptyLines.
-Layout/EmptyLineBetweenDefs:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-    - 'app/services/tournament_snapshot_importer.rb'
-    - 'e2e/lib/scenario_runner.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Layout/EmptyLines:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: around, only_before
-Layout/EmptyLinesAroundAccessModifier:
-  Exclude:
-    - 'db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: empty_lines, empty_lines_except_namespace, empty_lines_special, no_empty_lines, beginning_only, ending_only
-Layout/EmptyLinesAroundClassBody:
-  Exclude:
-    - 'config/application.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: IndentationWidth.
-# SupportedStyles: special_inside_parentheses, consistent, align_brackets
-Layout/FirstArrayElementIndentation:
-  EnforcedStyle: consistent
-
-# Offense count: 6
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: special_inside_parentheses, consistent, align_braces
-Layout/FirstHashElementIndentation:
-  Exclude:
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-
-# Offense count: 5
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: normal, indented_internal_methods
-Layout/IndentationConsistency:
-  Exclude:
-    - 'db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb'
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/routing/tournaments_routing_spec.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: Width, EnforcedStyleAlignWith, AllowedPatterns.
-# SupportedStylesAlignWith: start_of_line, relative_to_receiver
-Layout/IndentationWidth:
-  Exclude:
-    - 'db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb'
-    - 'spec/routing/tournaments_routing_spec.rb'
-
-# Offense count: 10
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: aligned, indented, indented_relative_to_receiver
-Layout/MultilineMethodCallIndentation:
-  Exclude:
-    - 'app/interactors/advance_teams_in_intermediate_stage.rb'
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/e2e/http/api_surface_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_live_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/e2e/http/tournament_lifecycle_spec.rb'
-    - 'spec/e2e/http/tournament_live_websocket_spec.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: aligned, indented
-Layout/MultilineOperationIndentation:
-  Exclude:
-    - 'app/services/group_stage_service.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-Layout/SpaceInsidePercentLiteralDelimiters:
-  Exclude:
-    - 'db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: final_newline, final_blank_line
-Layout/TrailingEmptyLines:
-  Exclude:
-    - 'spec/support/profile.rb'
-
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: AllowSafeAssignment.
-Lint/AssignmentInCondition:
-  Exclude:
-    - 'db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-Lint/ScriptPermission:
-  Exclude:
-    - 'script/e2e_scenarios.rb'
-    - 'script/wait_for_http.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowUnusedKeywordArguments, IgnoreEmptyMethods, IgnoreNotImplementedMethods, NotImplementedExceptions.
-# NotImplementedExceptions: NotImplementedError
-Lint/UnusedMethodArgument:
-  Exclude:
-    - 'app/controllers/application_controller.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-Lint/UselessAssignment:
-  Exclude:
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/models/beamer_spec.rb'
-
-# Offense count: 6
-# Configuration parameters: AllowedMethods, AllowedPatterns, CountRepeatedAttributes, Max.
-Metrics/AbcSize:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-    - 'app/services/tournament_snapshot_importer.rb'
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-
-# Offense count: 2
-# Configuration parameters: CountComments, Max, CountAsOne, AllowedMethods, AllowedPatterns.
-# AllowedMethods: refine
-Metrics/BlockLength:
-  Exclude:
-    - 'app/services/tournament_snapshot_importer.rb'
-    - 'db/schema.rb'
-
-# Offense count: 15
-# Configuration parameters: AllowedMethods, AllowedPatterns, Max.
-Metrics/CyclomaticComplexity:
-  Exclude:
-    - 'app/controllers/matches_controller.rb'
-    - 'app/controllers/tournaments_controller.rb'
-    - 'app/models/group_score.rb'
-    - 'app/models/stage.rb'
-    - 'app/services/group_stage_service.rb'
-    - 'app/services/playoff_stage_service.rb'
-    - 'e2e/lib/api_client.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-
-# Offense count: 1
-# Configuration parameters: CountComments, Max, CountAsOne, AllowedMethods, AllowedPatterns.
-Metrics/MethodLength:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-
-# Offense count: 1
-# Configuration parameters: Max, CountKeywordArgs, MaxOptionalParameters.
-Metrics/ParameterLists:
-  Exclude:
-    - 'e2e/lib/api_client.rb'
-
-# Offense count: 14
-# Configuration parameters: AllowedMethods, AllowedPatterns, Max.
-Metrics/PerceivedComplexity:
-  Exclude:
-    - 'app/controllers/matches_controller.rb'
-    - 'app/controllers/tournaments_controller.rb'
-    - 'app/models/group_score.rb'
-    - 'app/models/stage.rb'
-    - 'app/services/group_stage_service.rb'
-    - 'e2e/lib/api_client.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-
-# Offense count: 3
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Performance/Count:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-
-# Offense count: 2
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: SafeMultiline.
-Performance/DeleteSuffix:
-  Exclude:
-    - 'e2e/lib/action_cable_client.rb'
-    - 'e2e/lib/api_client.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Performance/RegexpMatch:
-  Exclude:
-    - 'config/spring.rb'
-
-# Offense count: 14
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Performance/TimesMap:
-  Exclude:
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/e2e/http/api_surface_spec.rb'
-    - 'spec/e2e/http/tournament_beamers_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_beamers_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_sync_test_spec.rb'
-    - 'spec/e2e/http/tournament_team_action_lists_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_timer_follow_sync_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_timer_websocket_spec.rb'
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-
-# Offense count: 3
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: NilOrEmpty, NotPresent, UnlessPresent.
-Rails/Blank:
-  Exclude:
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/e2e/http/tournament_sync_test_spec.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforceForPrefixed.
-Rails/Delegate:
-  Exclude:
-    - 'e2e/lib/action_cable_client.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: slashes, arguments
-Rails/FilePath:
-  Exclude:
-    - 'config/environments/development.rb'
-    - 'spec/rails_helper.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Rails/IndexBy:
-  Exclude:
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-
-# Offense count: 1
-# Configuration parameters: IgnoreScopes.
-Rails/InverseOf:
-  Exclude:
-    - 'app/models/tournament.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: NotNilAndNotEmpty, NotBlank, UnlessBlank.
-Rails/Present:
-  Exclude:
-    - 'e2e/lib/api_client.rb'
-
-# Offense count: 1
-Rails/ReversibleMigration:
-  Exclude:
-    - 'db/migrate/20240407180900_add_default_to_position_in_group_scores.rb'
-
-# Offense count: 9
-# Configuration parameters: ForbiddenMethods, AllowedMethods.
-# ForbiddenMethods: decrement!, decrement_counter, increment!, increment_counter, insert, insert!, insert_all, insert_all!, toggle!, touch, touch_all, update_all, update_attribute, update_column, update_columns, update_counters, upsert, upsert_all
-Rails/SkipsModelValidations:
-  Exclude:
-    - 'app/models/tournament_sync_queue_entry.rb'
-    - 'app/services/tournament_sync_pusher.rb'
-    - 'db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb'
-    - 'db/migrate/20260416102000_backfill_default_beamers_by_name.rb'
-    - 'spec/controllers/tournaments_controller_spec.rb'
-
-# Offense count: 33
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: strict, flexible
-Rails/TimeZone:
-  Exclude:
-    - 'e2e/lib/action_cable_client.rb'
-    - 'e2e/lib/scenario_runner.rb'
-    - 'spec/e2e/http/tournament_beamers_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_beamers_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_team_action_lists_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_timer_follow_sync_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_timer_websocket_spec.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, ProceduralMethods, FunctionalMethods, AllowedMethods, AllowedPatterns, AllowBracesOnProceduralOneLiners, BracesRequiredMethods.
-# SupportedStyles: line_count_based, semantic, braces_for_chaining, always_braces
-# ProceduralMethods: benchmark, bm, bmbm, create, each_with_object, measure, new, realtime, tap, with_object
-# FunctionalMethods: let, let!, subject, watch
-# AllowedMethods: lambda, proc, it
-Style/BlockDelimiters:
-  Exclude:
-    - 'spec/controllers/beamers_controller_spec.rb'
-
-# Offense count: 2
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: Keywords, RequireColon.
-# Keywords: TODO, FIXME, OPTIMIZE, HACK, REVIEW, NOTE
-Style/CommentAnnotation:
-  Exclude:
-    - 'spec/controllers/matches_controller_spec.rb'
-    - 'spec/services/group_stage_service_spec.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, SingleLineConditionsOnly, IncludeTernaryExpressions.
-# SupportedStyles: assign_to_condition, assign_inside_condition
-Style/ConditionalAssignment:
-  Exclude:
-    - 'spec/factories/tournaments.rb'
-
-# Offense count: 12
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: always, always_true, never
-Style/FrozenStringLiteralComment:
-  Exclude:
-    - 'config/boot.rb'
-    - 'config/initializers/filter_parameter_logging.rb'
-    - 'config/initializers/new_framework_defaults_7_0.rb'
-    - 'db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb'
-    - 'db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb'
-    - 'db/migrate/20220516203840_remove_not_null_on_active_storage_blobs_checksum.active_storage.rb'
-    - 'db/migrate/20240407175005_add_position_to_group_scores.rb'
-    - 'db/migrate/20240407180900_add_default_to_position_in_group_scores.rb'
-    - 'db/migrate/20250309202658_add_timer_end_to_tournaments.rb'
-    - 'db/migrate/20260423133000_add_timer_mode_to_tournaments.rb'
-    - 'db/schema.rb'
-    - 'spec/support/profile.rb'
-
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Style/GlobalStdStream:
-  Exclude:
-    - 'config/environments/production.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: MinBodyLength, AllowConsecutiveConditionals.
-Style/GuardClause:
-  Exclude:
-    - 'db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb'
-
-# Offense count: 2
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Style/IdenticalConditionalBranches:
-  Exclude:
-    - 'spec/e2e/http/tournament_lifecycle_spec.rb'
-
-# Offense count: 18
-# This cop supports safe autocorrection (--autocorrect).
-Style/IfUnlessModifier:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-    - 'app/services/group_stage_service.rb'
-    - 'app/services/playoff_stage_service.rb'
-    - 'e2e/lib/scenario_runner.rb'
-
-# Offense count: 2
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: InverseMethods, InverseBlocks.
-Style/InverseMethods:
-  Exclude:
-    - 'spec/e2e/http/tournament_lifecycle_spec.rb'
-
-# Offense count: 3
-Style/MultilineBlockChain:
-  Exclude:
-    - 'e2e/lib/api_client.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: MinDigits, Strict, AllowedNumbers, AllowedPatterns.
-Style/NumericLiterals:
-  Exclude:
-    - 'db/schema.rb'
-
-# Offense count: 2
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyle, AllowedMethods, AllowedPatterns.
-# SupportedStyles: predicate, comparison
-Style/NumericPredicate:
-  Exclude:
-    - 'e2e/lib/scenario_runner.rb'
-
-# Offense count: 1
-# Configuration parameters: AllowedMethods.
-# AllowedMethods: respond_to_missing?
-Style/OptionalBooleanParameter:
-  Exclude:
-    - 'app/services/playoff_stage_service.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-Style/RedundantFreeze:
-  Exclude:
-    - 'e2e/lib/scenario_runner.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AllowMultipleReturnValues.
-Style/RedundantReturn:
-  Exclude:
-    - 'app/controllers/tournaments_controller.rb'
-
-# Offense count: 3
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Style/RedundantSort:
-  Exclude:
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: ConvertCodeThatCanStartToReturnNil, AllowedMethods, MaxChainLength.
-# AllowedMethods: present?, blank?, presence, try, try!
-Style/SafeNavigation:
-  Exclude:
-    - 'config/spring.rb'
-
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: Mode.
-Style/StringConcatenation:
-  Exclude:
-    - 'config/spring.rb'
-
-# Offense count: 246
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
-# SupportedStyles: single_quotes, double_quotes
-Style/StringLiterals:
-  Exclude:
-    - 'config/boot.rb'
-    - 'db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb'
-    - 'db/schema.rb'
-    - 'spec/e2e/http/api_surface_spec.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: .
-# SupportedStyles: percent, brackets
-Style/SymbolArray:
-  EnforcedStyle: percent
-  MinSize: 10
-
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: AllowMethodsWithArguments, AllowedMethods, AllowedPatterns, AllowComments.
-# AllowedMethods: define_method, mail, respond_to
-Style/SymbolProc:
-  Exclude:
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: EnforcedStyleForMultiline.
-# SupportedStylesForMultiline: comma, consistent_comma, diff_comma, no_comma
-Style/TrailingCommaInArrayLiteral:
-  Exclude:
-    - 'spec/services/playoff_stage_service_spec.rb'
-
-# Offense count: 3
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: WordRegex.
-# SupportedStyles: percent, brackets
-Style/WordArray:
-  EnforcedStyle: percent
-  MinSize: 3
-
-# Offense count: 6
-# This cop supports unsafe autocorrection (--autocorrect-all).
-Style/ZeroLengthPredicate:
-  Exclude:
-    - 'app/models/stage.rb'
-    - 'app/services/group_stage_service.rb'
-
-# Offense count: 113
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: Max, AllowHeredoc, AllowURI, AllowQualifiedName, URISchemes, AllowRBSInlineAnnotation, AllowCopDirectives, AllowedPatterns, SplitStrings.
-# URISchemes: http, https
-Layout/LineLength:
-  Exclude:
-    - 'app/controllers/matches_controller.rb'
-    - 'app/controllers/tournaments_controller.rb'
-    - 'app/models/team_action_list.rb'
-    - 'app/services/group_stage_service.rb'
-    - 'app/services/playoff_stage_service.rb'
-    - 'db/schema.rb'
-    - 'e2e/lib/api_client.rb'
-    - 'e2e/lib/scenario_runner.rb'
-    - 'script/e2e_scenarios.rb'
-    - 'spec/controllers/groups_controller_spec.rb'
-    - 'spec/controllers/matches_controller_spec.rb'
-    - 'spec/controllers/stages_controller_spec.rb'
-    - 'spec/controllers/team_action_lists_controller_spec.rb'
-    - 'spec/e2e/http/api_surface_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_spec.rb'
-    - 'spec/e2e/http/tournament_follow_sync_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_lifecycle_spec.rb'
-    - 'spec/e2e/http/tournament_rendering_spec.rb'
-    - 'spec/e2e/http/tournament_sync_test_spec.rb'
-    - 'spec/e2e/http/tournament_team_action_lists_websocket_spec.rb'
-    - 'spec/e2e/http/tournament_timer_follow_sync_websocket_spec.rb'
-    - 'spec/factories/tournaments.rb'
-    - 'spec/services/group_stage_service_spec.rb'
-    - 'spec/services/team_action_list_service_spec.rb'
-    - 'spec/services/tournament_snapshot_importer_spec.rb'
-    - 'spec/services/tournament_sync_processor_spec.rb'
diff --git a/Dockerfile b/Dockerfile
index e7c10d1..ec73507 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -111,6 +111,7 @@ COPY script /app/script
 COPY config.ru Rakefile /app/
 COPY config/environments/production.rb /app/config/environments/beta.rb
 COPY tasks.py /app/tasks.py
+COPY .rubocop.yml /app/.rubocop.yml
 COPY e2e /app/e2e
 COPY lib /app/lib
 COPY spec /app/spec
diff --git a/Gemfile b/Gemfile
index 29fdec4..7fdce7e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -44,8 +44,8 @@ group :test, optional: true do
   gem 'factory_bot_rails'
   gem 'faker'
   gem 'rspec-rails'
-  gem 'shoulda-matchers'
   gem 'ruby-prof'
+  gem 'shoulda-matchers'
 end
 
 group :development, optional: true do
@@ -53,13 +53,13 @@ group :development, optional: true do
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'railroady'
   # Use sqlite3 as the database for Active Record
-  gem 'sqlite3'
   gem 'rubocop'
   gem 'rubocop-performance'
   gem 'rubocop-rails'
   gem 'solargraph'
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.1'
+  gem 'sqlite3'
 end
 
 group :production do
diff --git a/app/controllers/matches_controller.rb b/app/controllers/matches_controller.rb
index 2ea5ac3..17d8a82 100644
--- a/app/controllers/matches_controller.rb
+++ b/app/controllers/matches_controller.rb
@@ -38,7 +38,8 @@ class MatchesController < ApplicationController
       elsif match.save
         UpdateGroupsGroupScoresAndSave.call(group: @group)
         group_scores = group_scores_for_log(@group)
-        TournamentTransactionLogger.record_decider_match_created!(match: match, user: current_user, group_scores: group_scores)
+        TournamentTransactionLogger.record_decider_match_created!(match: match, user: current_user,
+                                                                  group_scores: group_scores)
         synced_tournament = @group.tournament
         render json: match, include: %w[match_scores.team group], status: :created
       else
@@ -90,7 +91,8 @@ class MatchesController < ApplicationController
   # PATCH /matches/1/swap
   def swap
     unless @match.swappable_with?(@swap_target)
-      render json: { error: 'Matches must be different group matches from the same group' }, status: :unprocessable_content
+      render json: { error: 'Matches must be different group matches from the same group' },
+             status: :unprocessable_content
       return
     end
 
@@ -107,7 +109,8 @@ class MatchesController < ApplicationController
     end
 
     swapped_matches = Match.where(id: [@match.id, @swap_target.id]).order(:position)
-    render json: swapped_matches, each_serializer: ExtendedMatchSerializer, include: %w[match_scores.team bets stage group]
+    render json: swapped_matches, each_serializer: ExtendedMatchSerializer,
+           include: %w[match_scores.team bets stage group]
     push_sync_if_needed!(synced_tournament)
     TournamentLiveBroadcast.call(synced_tournament.id)
   end
@@ -117,9 +120,7 @@ class MatchesController < ApplicationController
   def handle_match_end
     if @match.group_match?
       group = @match.group
-      unless UpdateGroupsGroupScoresAndSave.call(group: group).success?
-        logger.warn "Updating groups group score failed for #{group}"
-      end
+      logger.warn "Updating groups group score failed for #{group}" unless UpdateGroupsGroupScoresAndSave.call(group: group).success?
       @transaction_log_group_scores = group_scores_for_log(group)
       return
     end
@@ -290,9 +291,7 @@ class MatchesController < ApplicationController
       decider: true,
       match_scores: teams.map { |team| MatchScore.new(team: team) }
     ).tap do |match|
-      if team_ids.size != 2 || teams.size != 2
-        match.errors.add(:team_ids, 'must contain exactly two teams from this group')
-      end
+      match.errors.add(:team_ids, 'must contain exactly two teams from this group') if team_ids.size != 2 || teams.size != 2
     end
   end
 
diff --git a/app/controllers/teams_controller.rb b/app/controllers/teams_controller.rb
index 0450240..d6e2808 100644
--- a/app/controllers/teams_controller.rb
+++ b/app/controllers/teams_controller.rb
@@ -71,9 +71,7 @@ class TeamsController < ApplicationController
     return [] if id_values.empty?
 
     User.where(id: id_values).tap do |players|
-      unless players.size == id_values.uniq.size
-        raise ActiveRecord::RecordNotFound.new('Could not find all players', 'User')
-      end
+      raise ActiveRecord::RecordNotFound.new('Could not find all players', 'User') unless players.size == id_values.uniq.size
     end
   end
 
diff --git a/app/controllers/tournaments_controller.rb b/app/controllers/tournaments_controller.rb
index 04f92c2..8bbebcf 100644
--- a/app/controllers/tournaments_controller.rb
+++ b/app/controllers/tournaments_controller.rb
@@ -14,7 +14,8 @@ class TournamentsController < ApplicationController
   before_action :set_tournament_for_show, only: %i[show]
   before_action :set_tournament,
                 only: %i[update destroy destroy_playoffs set_timer timer sync_state test_sync start_next_group_matches]
-  before_action :authenticate_user!, only: %i[create update destroy destroy_playoffs set_timer test_sync start_next_group_matches]
+  before_action :authenticate_user!,
+                only: %i[create update destroy destroy_playoffs set_timer test_sync start_next_group_matches]
   before_action -> { require_owner! @tournament.owner },
                 only: %i[update destroy destroy_playoffs set_timer test_sync start_next_group_matches]
   before_action :validate_create_params, only: %i[create]
@@ -74,6 +75,7 @@ class TournamentsController < ApplicationController
     end
 
     raise ActionController::ParameterMissing, :teams if teams.nil?
+
     if group_stage
       params.require(:playoff_teams_amount)
       groups = organize_teams_in_groups(teams)
@@ -339,7 +341,7 @@ class TournamentsController < ApplicationController
     return if ActiveModel::Type::Boolean.new.cast(params[:read_only_mode])
 
     teams = params['teams']
-    return if teams.is_a?(Array) && teams.reject { |t| t.is_a? ActionController::Parameters }.count.zero?
+    return if teams.is_a?(Array) && teams.count { |team| !team.is_a?(ActionController::Parameters) }.zero?
 
     render json: { error: 'Invalid teams array' }, status: :unprocessable_content
   end
@@ -374,12 +376,16 @@ class TournamentsController < ApplicationController
       error: 'playoff_teams_amount, instant_finalists_amount and intermediate_round_participants_amount don\'t match'
     }, status: :unprocessable_content
   end
+
   def sync_state_params
     params.require(:snapshot).permit!.to_h
   end
 
   def authorize_sync_request!
-    return render json: { error: 'Tournament is not configured to accept sync pushes' }, status: :unprocessable_content unless @tournament.sync_accepts_push?
+    unless @tournament.sync_accepts_push?
+      return render json: { error: 'Tournament is not configured to accept sync pushes' },
+                    status: :unprocessable_content
+    end
 
     token = request.authorization.to_s.delete_prefix('Bearer ').presence || request.headers['X-Tournament-Sync-Token'].to_s
     return render json: { error: 'Missing sync token' }, status: :unauthorized if token.blank?
@@ -425,13 +431,9 @@ class TournamentsController < ApplicationController
     timer_reason_text = params[:timer_reason_text]
     clear_timer = ActiveModel::Type::Boolean.new.cast(params[:clear_timer])
 
-    if clear_timer
-      return validate_clear_timer_params(timestamp, timestamp_seconds, timer_mode, timer_reason, timer_reason_text)
-    end
+    return validate_clear_timer_params(timestamp, timestamp_seconds, timer_mode, timer_reason, timer_reason_text) if clear_timer
 
-    if timer_mode.present? && !Tournament::TIMER_MODES.include?(timer_mode)
-      return render_timer_validation_error('Invalid timer_mode')
-    end
+    return render_timer_validation_error('Invalid timer_mode') if timer_mode.present? && !Tournament::TIMER_MODES.include?(timer_mode)
 
     timer_reason_error = validate_timer_reason_params(
       timer_reason,
@@ -441,7 +443,20 @@ class TournamentsController < ApplicationController
     )
     return render_timer_validation_error(timer_reason_error) if timer_reason_error
 
-    # throw error if both timestamp and timestamp_seconds are present
+    return if validate_timer_timestamp_params(timestamp, timestamp_seconds, timer_mode)
+
+    if timer_mode == 'countup'
+      params[:timestamp] = Time.zone.now
+    elsif timer_mode.present?
+      render_timer_validation_error('timer_mode requires timestamp, timestamp_seconds, or clear_timer')
+    elsif timer_reason_update_requested
+      render_timer_validation_error('timer_reason requires active timer') unless timer_active?
+    else
+      render_timer_validation_error('timestamp, timestamp_seconds, or clear_timer is required')
+    end
+  end
+
+  def validate_timer_timestamp_params(timestamp, timestamp_seconds, timer_mode)
     if timestamp.present? && timestamp_seconds.present?
       return render_timer_validation_error('Only one of timestamp or timestamp_seconds is allowed')
     end
@@ -450,43 +465,34 @@ class TournamentsController < ApplicationController
       return render_timer_validation_error('timestamp_seconds is only allowed for countdown mode')
     end
 
-    if timestamp_seconds.present?
-      begin
-        timestamp_seconds = Integer(timestamp_seconds)
-      rescue ArgumentError
-        return render_timer_validation_error('Invalid seconds format')
-      end
+    return validate_timestamp_seconds_param(timestamp_seconds) if timestamp_seconds.present?
+    return validate_timestamp_param(timestamp, timer_mode) if timestamp.present?
 
-      if timestamp_seconds <= 0
-        return render_timer_validation_error('Timestamp must be in the future for countdown mode')
-      end
+    false
+  end
 
-      parsed_time = Time.zone.now + timestamp_seconds
-      params[:timestamp] = parsed_time
-      params[:timer_mode] = 'countdown'
-    elsif timestamp.present?
-      begin
-        parsed_time = Time.zone.parse(timestamp)
-        if parsed_time.nil?
-          return render_timer_validation_error('Invalid timestamp format')
-        elsif timer_mode != 'countup' && !parsed_time.future?
-          return render_timer_validation_error('Timestamp must be in the future for countdown mode')
-        end
+  def validate_timestamp_seconds_param(timestamp_seconds)
+    seconds = Integer(timestamp_seconds)
+    return render_timer_validation_error('Timestamp must be in the future for countdown mode') if seconds <= 0
 
-        params[:timestamp] = parsed_time
-        params[:timer_mode] = timer_mode.presence || 'countdown'
-      rescue ArgumentError
-        return render_timer_validation_error('Invalid timestamp format')
-      end
-    elsif timer_mode == 'countup'
-      params[:timestamp] = Time.zone.now
-    elsif timer_mode.present?
-      return render_timer_validation_error('timer_mode requires timestamp, timestamp_seconds, or clear_timer')
-    elsif timer_reason_update_requested
-      return render_timer_validation_error('timer_reason requires active timer') unless timer_active?
-    else
-      return render_timer_validation_error('timestamp, timestamp_seconds, or clear_timer is required')
+    params[:timestamp] = Time.zone.now + seconds
+    params[:timer_mode] = 'countdown'
+  rescue ArgumentError
+    render_timer_validation_error('Invalid seconds format')
+  end
+
+  def validate_timestamp_param(timestamp, timer_mode)
+    parsed_time = Time.zone.parse(timestamp)
+    if parsed_time.nil?
+      return render_timer_validation_error('Invalid timestamp format')
+    elsif timer_mode != 'countup' && !parsed_time.future?
+      return render_timer_validation_error('Timestamp must be in the future for countdown mode')
     end
+
+    params[:timestamp] = parsed_time
+    params[:timer_mode] = timer_mode.presence || 'countdown'
+  rescue ArgumentError
+    render_timer_validation_error('Invalid timestamp format')
   end
 
   def normalize_timer_reason_params
@@ -518,17 +524,13 @@ class TournamentsController < ApplicationController
     timer_reason_param_present,
     timer_reason_text_param_present
   )
-    if timer_reason_text_param_present && !timer_reason_param_present
-      return 'timer_reason is required when timer_reason_text is provided'
-    end
+    return 'timer_reason is required when timer_reason_text is provided' if timer_reason_text_param_present && !timer_reason_param_present
     return if timer_reason.blank? && timer_reason_text.blank?
 
     return 'timer_reason_text is only allowed when timer_reason is custom' if timer_reason.blank?
     return 'Invalid timer_reason' unless Tournament::TIMER_REASONS.include?(timer_reason)
 
-    if timer_reason == 'custom' && timer_reason_text.blank?
-      return 'timer_reason_text is required for custom timer_reason'
-    end
+    return 'timer_reason_text is required for custom timer_reason' if timer_reason == 'custom' && timer_reason_text.blank?
 
     return unless timer_reason != 'custom' && timer_reason_text.present?
 
diff --git a/app/interactors/advance_teams_in_intermediate_stage.rb b/app/interactors/advance_teams_in_intermediate_stage.rb
index 18db320..18f2cb5 100644
--- a/app/interactors/advance_teams_in_intermediate_stage.rb
+++ b/app/interactors/advance_teams_in_intermediate_stage.rb
@@ -16,9 +16,9 @@ class AdvanceTeamsInIntermediateStage
 
     # populate stage below with the "winners" from single team matches
     matches.select { |m| m.state == 'single_team' }
-                      .each do |match|
-                        context.fail! unless PopulateMatchBelowAndSave.call(match: match).success?
-                      end
+           .each do |match|
+      context.fail! unless PopulateMatchBelowAndSave.call(match:).success?
+    end
     (context.object_to_save ||= []) << intermediate_stage
   end
 end
diff --git a/app/models/stage.rb b/app/models/stage.rb
index fd78498..3784d18 100644
--- a/app/models/stage.rb
+++ b/app/models/stage.rb
@@ -10,9 +10,9 @@ class Stage < ApplicationRecord
   delegate :owner, to: :tournament
 
   def teams
-    if !matches.size.zero?
+    if !matches.empty?
       matches.map(&:teams).flatten.uniq
-    elsif !groups.size.zero?
+    elsif !groups.empty?
       groups.map(&:teams).flatten.uniq
     else
       []
@@ -20,9 +20,9 @@ class Stage < ApplicationRecord
   end
 
   def over?
-    return matches.find { |m| m.state != 'finished' }.nil? unless matches.size.zero?
+    return matches.find { |m| m.state != 'finished' }.nil? unless matches.empty?
 
-    unless groups.size.zero? && groups.map(&:matches).flatten.size.zero?
+    unless groups.empty? && groups.map(&:matches).flatten.empty?
       relevant_matches = groups.map(&:matches).flatten.reject(&:decider?)
       return relevant_matches.find { |m| m.state != 'finished' }.nil?
     end
diff --git a/app/models/team_action_list.rb b/app/models/team_action_list.rb
index 018bd0a..e94ea20 100644
--- a/app/models/team_action_list.rb
+++ b/app/models/team_action_list.rb
@@ -6,7 +6,8 @@ class TeamActionList < ApplicationRecord
 
   validates :name, :key, :action_name, :source, presence: true
   validates :key, uniqueness: { scope: :tournament_id }
-  validates :key, format: { with: /\A[a-z0-9_]+\z/, message: 'may only contain lowercase letters, numbers, and underscores' }
+  validates :key,
+            format: { with: /\A[a-z0-9_]+\z/, message: 'may only contain lowercase letters, numbers, and underscores' }
 
   delegate :owner, to: :tournament
 
@@ -20,7 +21,7 @@ class TeamActionList < ApplicationRecord
       team_action_items.where.not(team_id: desired_team_ids).destroy_all
 
       desired_team_ids.each do |team_id|
-        team_action_items.find_or_create_by!(team_id: team_id)
+        team_action_items.find_or_create_by!(team_id:)
       end
     end
   end
diff --git a/app/models/tournament.rb b/app/models/tournament.rb
index 6f0ad3a..dee1591 100644
--- a/app/models/tournament.rb
+++ b/app/models/tournament.rb
@@ -9,7 +9,7 @@ class Tournament < ApplicationRecord
   METADATA_STRING_ATTRIBUTES = %i[location website_url].freeze
 
   belongs_to :user
-  belongs_to :owner, class_name: 'User', foreign_key: :user_id
+  belongs_to :owner, class_name: 'User', foreign_key: :user_id, inverse_of: :tournaments
   has_many :teams, dependent: :destroy
   has_many :stages, dependent: :destroy
   has_many :beamers, dependent: :destroy
diff --git a/app/models/tournament_sync_queue_entry.rb b/app/models/tournament_sync_queue_entry.rb
index 297cd4b..e1fcc19 100644
--- a/app/models/tournament_sync_queue_entry.rb
+++ b/app/models/tournament_sync_queue_entry.rb
@@ -45,9 +45,9 @@ class TournamentSyncQueueEntry < ApplicationRecord
   def acquire_lock!
     token = SecureRandom.hex(8)
     updated = self.class
-                  .where(id: id)
+                  .where(id:)
                   .where(locked_at: nil)
-                  .or(self.class.where(id: id).where('locked_at < ?', Time.current - LOCK_TTL))
+                  .or(self.class.where(id:).where('locked_at < ?', Time.current - LOCK_TTL))
                   .update_all(locked_at: Time.current, lock_token: token)
     return nil if updated.zero?
 
diff --git a/app/serializers/tournament_serializer.rb b/app/serializers/tournament_serializer.rb
index f23cf83..30c4503 100644
--- a/app/serializers/tournament_serializer.rb
+++ b/app/serializers/tournament_serializer.rb
@@ -7,7 +7,7 @@ class TournamentSerializer < SimpleTournamentSerializer
   attribute :sync_target_url, if: :sync_metadata_visible?
   attribute :sync_auth_configured, if: :sync_metadata_visible?
   attribute :sync_last_push_error, if: :sync_metadata_visible?
-             # NEVER expose sync_auth_token anywhere - it should only ever be written to or checked against
+  # NEVER expose sync_auth_token anywhere - it should only ever be written to or checked against
 
   has_many :stages
   has_many :team_action_lists
diff --git a/app/services/group_stage_service.rb b/app/services/group_stage_service.rb
index c4ac9e8..c3855b3 100644
--- a/app/services/group_stage_service.rb
+++ b/app/services/group_stage_service.rb
@@ -3,18 +3,18 @@
 class GroupStageService
   class << self
     def generate_group_stage(groups)
-      raise 'Cannot generate group stage without groups' if groups.length.zero?
+      raise 'Cannot generate group stage without groups' if groups.empty?
 
       # raise an error if the average group size is not a whole number
       raise 'Groups need to be equal size' unless (groups.flatten.length.to_f / groups.length % 1).zero?
 
       groups = groups.map(&method(:get_group_object_from)).each_with_index { |group, i| group.number = i + 1 }
-      Stage.new level: -1, groups: groups, state: :in_progress
+      Stage.new level: -1, groups:, state: :in_progress
     end
 
     def get_group_object_from(team_array)
       Group.new matches: generate_all_matches_between(team_array),
-                group_scores: team_array.map { |team| GroupScore.new team: team }
+                group_scores: team_array.map { |team| GroupScore.new team: }
     end
 
     def deal_with_spacing_of_teams(matches, team_size)
@@ -71,7 +71,7 @@ class GroupStageService
     def update_group_scores(group)
       changed_group_scores = []
       group.teams.each do |team|
-        group_score = group.group_scores.find_by(team: team)
+        group_score = group.group_scores.find_by(team:)
         matches = group.matches.select { |match| match.teams.include? team }
         # reset previous values
         group_score.group_points = 0
@@ -217,7 +217,7 @@ class GroupStageService
     def comparison_partner_index(sorted_group_scores, index)
       return index - 1 if index.positive? && sorted_group_scores[index - 1].position == sorted_group_scores[index].position
       return index + 1 if index < sorted_group_scores.size - 1 &&
-        sorted_group_scores[index + 1].position == sorted_group_scores[index].position
+                          sorted_group_scores[index + 1].position == sorted_group_scores[index].position
       return index - 1 if index.positive?
       return index + 1 if sorted_group_scores.size > 1
 
@@ -239,11 +239,9 @@ class GroupStageService
       start_index -= 1 while start_index.positive? && sorted_group_scores[start_index - 1].position == position
 
       end_index = index
-      while end_index < sorted_group_scores.size - 1 && sorted_group_scores[end_index + 1].position == position
-        end_index += 1
-      end
+      end_index += 1 while end_index < sorted_group_scores.size - 1 && sorted_group_scores[end_index + 1].position == position
 
-      { start_index: start_index, end_index: end_index }
+      { start_index:, end_index: }
     end
 
     def advancing_slots_for_group(group)
@@ -272,7 +270,7 @@ class GroupStageService
       advancing_slots = advancing_slots_for_group(group)
       group_ready_for_decider_check = regular_group_matches_finished?(group)
 
-      cache = sorted_group_scores.each_with_index.each_with_object({}) do |(group_score, index), decisions|
+      cache = sorted_group_scores.each_with_index.with_object({}) do |(group_score, index), decisions|
         next if sorted_group_scores.size <= 1
 
         comparison_index = comparison_partner_index(sorted_group_scores, index)
@@ -296,8 +294,9 @@ class GroupStageService
           decider_match_id: comparison_reason[:decider_match_id],
           tied: comparison_reason[:tied],
           needs_decider_match: group_ready_for_decider_check &&
-            comparison_reason[:tied] &&
-            unresolved_tie_affects_advancing_placements?(sorted_group_scores, group_score, advancing_slots)
+                               comparison_reason[:tied] &&
+                               unresolved_tie_affects_advancing_placements?(sorted_group_scores, group_score,
+                                                                            advancing_slots)
         }
       end
 
diff --git a/app/services/playoff_stage_service.rb b/app/services/playoff_stage_service.rb
index 20def6b..085c30c 100644
--- a/app/services/playoff_stage_service.rb
+++ b/app/services/playoff_stage_service.rb
@@ -16,7 +16,7 @@ class PlayoffStageService
       initial_stage.state = :intermediate_stage unless initial_stage.matches.find(&:single_team?).nil?
       playoffs << initial_stage
       # empty stages are the stages, the tournament is filled with to have the matches ready for later
-      empty_stages = generate_stages_with_empty_matches(stage_count - 1, teams.size > 3)
+      empty_stages = generate_stages_with_empty_matches(stage_count - 1, include_third_place_match: teams.size > 3)
       playoffs.concat empty_stages
       playoffs
     end
@@ -25,7 +25,7 @@ class PlayoffStageService
     #
     # @param stage_count [Integer] number of stages to generate
     # @return [Array] the generated stages
-    def generate_stages_with_empty_matches(stage_count, include_third_place_match = false)
+    def generate_stages_with_empty_matches(stage_count, include_third_place_match: false)
       empty_stages = []
       stage_count.times do |i|
         match_count = 2**i
@@ -82,7 +82,9 @@ class PlayoffStageService
       # of which the winners advance into the match below
       # depending on the position of the match, the companion match is either on the left or right of it
       companion_match = find_companion_match(current_match.position, current_stage)
-      return populate_final_stage_matches(current_match, companion_match, next_stage) if semifinal_match?(current_stage, next_stage)
+      return populate_final_stage_matches(current_match, companion_match, next_stage) if semifinal_match?(
+        current_stage, next_stage
+      )
 
       winners = get_winners_of(companion_match, current_match)
       populate_match!(match: next_stage.matches.find { |m| m.position == current_match.position / 2 }, teams: winners)
diff --git a/app/services/team_action_item_update.rb b/app/services/team_action_item_update.rb
index 955051e..8775d19 100644
--- a/app/services/team_action_item_update.rb
+++ b/app/services/team_action_item_update.rb
@@ -3,7 +3,7 @@
 class TeamActionItemUpdate
   class << self
     def call(team_action_item:, completed:)
-      new(team_action_item: team_action_item, completed: completed).call
+      new(team_action_item:, completed:).call
     end
   end
 
@@ -13,7 +13,7 @@ class TeamActionItemUpdate
   end
 
   def call
-    return false unless team_action_item.update(completed: completed)
+    return false unless team_action_item.update(completed:)
 
     TournamentSyncEnqueue.call(team_action_item.tournament)
     true
diff --git a/app/services/tournament_playoff_deletion.rb b/app/services/tournament_playoff_deletion.rb
index fbeafd8..0e3066b 100644
--- a/app/services/tournament_playoff_deletion.rb
+++ b/app/services/tournament_playoff_deletion.rb
@@ -23,9 +23,7 @@ class TournamentPlayoffDeletion
 
     playoff_stages = tournament.stages.reload.select { |stage| stage.level >= 0 }
     return failure('Playoffs have not been generated') if playoff_stages.empty?
-    unless playoffs_deletable?(playoff_stages)
-      return failure('Playoffs cannot be deleted after matches have started or scores changed')
-    end
+    return failure('Playoffs cannot be deleted after matches have started or scores changed') unless playoffs_deletable?(playoff_stages)
 
     playoff_stages.each(&:destroy!)
     group_stage.update!(state: :in_progress)
diff --git a/app/services/tournament_snapshot_importer.rb b/app/services/tournament_snapshot_importer.rb
index 6582d27..898d23a 100644
--- a/app/services/tournament_snapshot_importer.rb
+++ b/app/services/tournament_snapshot_importer.rb
@@ -14,7 +14,7 @@ class TournamentSnapshotImporter
   ].freeze
 
   def self.import!(tournament:, snapshot:)
-    new(tournament: tournament, snapshot: snapshot).import!
+    new(tournament:, snapshot:).import!
   end
 
   def initialize(tournament:, snapshot:)
@@ -222,6 +222,7 @@ class TournamentSnapshotImporter
     stale_records = existing_records.reject { |record| source_ids.include?(record.sync_source_id) }
     stale_records.each(&:destroy!)
   end
+
   def parse_time(value)
     return nil if value.blank?
 
@@ -242,6 +243,6 @@ class TournamentSnapshotImporter
   def code_taken_by_another_tournament?(code)
     return false if code.blank?
 
-    Tournament.where(code: code).where.not(id: tournament.id).exists?
+    Tournament.where(code:).where.not(id: tournament.id).exists?
   end
 end
diff --git a/app/services/tournament_sync_enqueue.rb b/app/services/tournament_sync_enqueue.rb
index f2694b7..3c28275 100644
--- a/app/services/tournament_sync_enqueue.rb
+++ b/app/services/tournament_sync_enqueue.rb
@@ -13,7 +13,7 @@ class TournamentSyncEnqueue
     return false unless tournament.sync_push_enabled?
 
     payload = TournamentSnapshotBuilder.build(fresh_tournament)
-    entry = TournamentSyncQueueEntry.find_or_initialize_by(tournament: tournament)
+    entry = TournamentSyncQueueEntry.find_or_initialize_by(tournament:)
     entry.snapshot_json = JSON.dump(payload)
     entry.status = 'pending'
     entry.attempts = 0
diff --git a/app/services/tournament_sync_pusher.rb b/app/services/tournament_sync_pusher.rb
index bcb02b1..05f2c04 100644
--- a/app/services/tournament_sync_pusher.rb
+++ b/app/services/tournament_sync_pusher.rb
@@ -27,11 +27,9 @@ class TournamentSyncPusher
   end
 
   def push_snapshot!(snapshot)
-    response = perform_request(snapshot: snapshot)
+    response = perform_request(snapshot:)
 
-    unless response.is_a?(Net::HTTPSuccess)
-      raise SyncFailed, "sync push failed with status #{response.code}: #{response.body}"
-    end
+    raise SyncFailed, "sync push failed with status #{response.code}: #{response.body}" unless response.is_a?(Net::HTTPSuccess)
 
     tournament.update_columns(sync_last_pushed_at: Time.current, sync_last_push_error: nil)
     true
@@ -53,7 +51,7 @@ class TournamentSyncPusher
     request['accept'] = 'application/json'
     request['content-type'] = 'application/json'
     request['authorization'] = "Bearer #{tournament.sync_auth_token}"
-    request.body = JSON.dump({ snapshot: snapshot })
+    request.body = JSON.dump({ snapshot: })
 
     Net::HTTP.start(uri.host, uri.port, use_ssl: uri.scheme == 'https') do |http|
       timeout = http_timeout_seconds
diff --git a/app/services/tournament_transaction_logger.rb b/app/services/tournament_transaction_logger.rb
index 90b0255..2cd1e43 100644
--- a/app/services/tournament_transaction_logger.rb
+++ b/app/services/tournament_transaction_logger.rb
@@ -5,9 +5,7 @@ class TournamentTransactionLogger
     def lock_tournament!(tournament)
       raise ArgumentError, 'tournament is required' if tournament.nil?
 
-      unless ActiveRecord::Base.connection.transaction_open?
-        raise 'Tournament transaction log writes must happen inside a transaction'
-      end
+      raise 'Tournament transaction log writes must happen inside a transaction' unless ActiveRecord::Base.connection.transaction_open?
 
       # Lock a fresh row instance so callers keep saved_change_to_* state for
       # after_commit callbacks on the object they just updated.
diff --git a/app/services/user_service.rb b/app/services/user_service.rb
index f950f0e..badcf98 100644
--- a/app/services/user_service.rb
+++ b/app/services/user_service.rb
@@ -7,7 +7,7 @@ class UserService
 
   def bet!(match, team)
     validate_bet! match, team
-    @user.bets.create! match: match, team: team
+    @user.bets.create! match:, team:
   end
 
   private
diff --git a/config/application.rb b/config/application.rb
index dbdbb57..f45f03b 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -50,6 +50,5 @@ module TurniereBackend
     config.action_mailer.default_options = {
       from: 'noreply@turnie.re'
     }
-
   end
 end
diff --git a/config/boot.rb b/config/boot.rb
index 988a5dd..c04863f 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,4 +1,6 @@
-ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
+# frozen_string_literal: true
 
-require "bundler/setup" # Set up gems listed in the Gemfile.
-require "bootsnap/setup" # Speed up boot time by caching expensive operations.
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
+
+require 'bundler/setup' # Set up gems listed in the Gemfile.
+require 'bootsnap/setup' # Speed up boot time by caching expensive operations.
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 3255142..48caece 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -16,7 +16,7 @@ Rails.application.configure do
 
   # Enable/disable caching. By default caching is disabled.
   # Run rails dev:cache to toggle caching.
-  if Rails.root.join('tmp', 'caching-dev.txt').exist?
+  if Rails.root.join('tmp/caching-dev.txt').exist?
     config.action_controller.perform_caching = true
 
     config.cache_store = :memory_store
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 360a4b1..fca6957 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -61,7 +61,7 @@ Rails.application.configure do
   config.active_support.deprecation = :notify
 
   # Use default logging formatter so that PID and timestamp are not suppressed.
-  config.log_formatter = ::Logger::Formatter.new
+  config.log_formatter = Logger::Formatter.new
 
   # Use a different logger for distributed setups.
   # require 'syslog/logger'
@@ -91,5 +91,5 @@ Rails.application.configure do
   end
 
   # Logging to STDOUT (running in docker by default)
-  config.logger = Logger.new(STDOUT)
+  config.logger = Logger.new($stdout)
 end
diff --git a/config/initializers/devise_routes_rails_8_compat.rb b/config/initializers/devise_routes_rails_8_compat.rb
index d460935..a7194fc 100644
--- a/config/initializers/devise_routes_rails_8_compat.rb
+++ b/config/initializers/devise_routes_rails_8_compat.rb
@@ -14,14 +14,14 @@ module DeviseRoutesRails8Compat
 
   def devise_password(mapping, controllers)
     resource :password,
-             only: [:new, :create, :edit, :update],
+             only: %i[new create edit update],
              path: mapping.path_names[:password],
              controller: controllers[:passwords]
   end
 
   def devise_confirmation(mapping, controllers)
     resource :confirmation,
-             only: [:new, :create, :show],
+             only: %i[new create show],
              path: mapping.path_names[:confirmation],
              controller: controllers[:confirmations]
   end
@@ -30,14 +30,14 @@ module DeviseRoutesRails8Compat
     return unless mapping.to.unlock_strategy_enabled?(:email)
 
     resource :unlock,
-             only: [:new, :create, :show],
+             only: %i[new create show],
              path: mapping.path_names[:unlock],
              controller: controllers[:unlocks]
   end
 
   def devise_registration(mapping, controllers)
     resource :registration,
-             only: [:new, :create, :edit, :update, :destroy],
+             only: %i[new create edit update destroy],
              path: mapping.path_names[:registration],
              path_names: {
                new: mapping.path_names[:sign_up],
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index adc6568..3df77c5 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 # 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
 # sensitive information. See the ActiveSupport::ParameterFilter documentation for supported
 # notations and behaviors.
-Rails.application.config.filter_parameters += [
-  :passw, :secret, :token, :_key, :crypt, :salt, :certificate, :otp, :ssn
+Rails.application.config.filter_parameters += %i[
+  passw secret token _key crypt salt certificate otp ssn
 ]
diff --git a/config/initializers/new_framework_defaults_7_0.rb b/config/initializers/new_framework_defaults_7_0.rb
index a579326..506ccb1 100644
--- a/config/initializers/new_framework_defaults_7_0.rb
+++ b/config/initializers/new_framework_defaults_7_0.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 #
 # This file eases your Rails 7.0 framework defaults upgrade.
diff --git a/config/spring.rb b/config/spring.rb
index 2be7406..c7fde87 100644
--- a/config/spring.rb
+++ b/config/spring.rb
@@ -8,10 +8,9 @@
 ].each { |path| Spring.watch(path) }
 
 Spring.after_fork do
-  if ENV['DEBUGGER_STORED_RUBYLIB']
-    ENV['DEBUGGER_STORED_RUBYLIB'].split(File::PATH_SEPARATOR).each do |path|
-      next unless path =~ /ruby-debug-ide/
-      load path + '/ruby-debug-ide/multiprocess/starter.rb'
-    end
+  ENV['DEBUGGER_STORED_RUBYLIB']&.split(File::PATH_SEPARATOR)&.each do |path|
+    next unless path.include?('ruby-debug-ide')
+
+    load "#{path}/ruby-debug-ide/multiprocess/starter.rb"
   end
 end
diff --git a/db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb b/db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb
index a15c6ce..735df75 100644
--- a/db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb
+++ b/db/migrate/20220516203838_add_service_name_to_active_storage_blobs.active_storage.rb
@@ -1,17 +1,19 @@
+# frozen_string_literal: true
+
 # This migration comes from active_storage (originally 20190112182829)
 class AddServiceNameToActiveStorageBlobs < ActiveRecord::Migration[6.0]
   def up
     return unless table_exists?(:active_storage_blobs)
 
-    unless column_exists?(:active_storage_blobs, :service_name)
-      add_column :active_storage_blobs, :service_name, :string
+    return if column_exists?(:active_storage_blobs, :service_name)
 
-      if configured_service = ActiveStorage::Blob.service.name
-        ActiveStorage::Blob.unscoped.update_all(service_name: configured_service)
-      end
+    add_column :active_storage_blobs, :service_name, :string
 
-      change_column :active_storage_blobs, :service_name, :string, null: false
+    if (configured_service = ActiveStorage::Blob.service.name)
+      ActiveStorage::Blob.unscoped.update_all(service_name: configured_service)
     end
+
+    change_column :active_storage_blobs, :service_name, :string, null: false
   end
 
   def down
diff --git a/db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb b/db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb
index 94ac83a..ca0e862 100644
--- a/db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb
+++ b/db/migrate/20220516203839_create_active_storage_variant_records.active_storage.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This migration comes from active_storage (originally 20191206030411)
 class CreateActiveStorageVariantRecords < ActiveRecord::Migration[6.0]
   def change
@@ -8,20 +10,21 @@ class CreateActiveStorageVariantRecords < ActiveRecord::Migration[6.0]
       t.belongs_to :blob, null: false, index: false, type: blobs_primary_key_type
       t.string :variation_digest, null: false
 
-      t.index %i[ blob_id variation_digest ], name: "index_active_storage_variant_records_uniqueness", unique: true
+      t.index %i[blob_id variation_digest], name: 'index_active_storage_variant_records_uniqueness', unique: true
       t.foreign_key :active_storage_blobs, column: :blob_id
     end
   end
 
   private
-    def primary_key_type
-      config = Rails.configuration.generators
-      config.options[config.orm][:primary_key_type] || :primary_key
-    end
 
-    def blobs_primary_key_type
-      pkey_name = connection.primary_key(:active_storage_blobs)
-      pkey_column = connection.columns(:active_storage_blobs).find { |c| c.name == pkey_name }
-      pkey_column.bigint? ? :bigint : pkey_column.type
-    end
+  def primary_key_type
+    config = Rails.configuration.generators
+    config.options[config.orm][:primary_key_type] || :primary_key
+  end
+
+  def blobs_primary_key_type
+    pkey_name = connection.primary_key(:active_storage_blobs)
+    pkey_column = connection.columns(:active_storage_blobs).find { |c| c.name == pkey_name }
+    pkey_column.bigint? ? :bigint : pkey_column.type
+  end
 end
diff --git a/db/migrate/20220516203840_remove_not_null_on_active_storage_blobs_checksum.active_storage.rb b/db/migrate/20220516203840_remove_not_null_on_active_storage_blobs_checksum.active_storage.rb
index 93c8b85..6f31822 100644
--- a/db/migrate/20220516203840_remove_not_null_on_active_storage_blobs_checksum.active_storage.rb
+++ b/db/migrate/20220516203840_remove_not_null_on_active_storage_blobs_checksum.active_storage.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This migration comes from active_storage (originally 20211119233751)
 class RemoveNotNullOnActiveStorageBlobsChecksum < ActiveRecord::Migration[6.0]
   def change
diff --git a/db/migrate/20240407175005_add_position_to_group_scores.rb b/db/migrate/20240407175005_add_position_to_group_scores.rb
index ab350b6..01dabba 100644
--- a/db/migrate/20240407175005_add_position_to_group_scores.rb
+++ b/db/migrate/20240407175005_add_position_to_group_scores.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddPositionToGroupScores < ActiveRecord::Migration[7.0]
   def change
     add_column :group_scores, :position, :integer
diff --git a/db/migrate/20240407180900_add_default_to_position_in_group_scores.rb b/db/migrate/20240407180900_add_default_to_position_in_group_scores.rb
index 256b0fe..2d3d841 100644
--- a/db/migrate/20240407180900_add_default_to_position_in_group_scores.rb
+++ b/db/migrate/20240407180900_add_default_to_position_in_group_scores.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddDefaultToPositionInGroupScores < ActiveRecord::Migration[7.0]
   def change
     change_column_default :group_scores, :position, 0
diff --git a/db/migrate/20250309202658_add_timer_end_to_tournaments.rb b/db/migrate/20250309202658_add_timer_end_to_tournaments.rb
index 1762bec..09a70df 100644
--- a/db/migrate/20250309202658_add_timer_end_to_tournaments.rb
+++ b/db/migrate/20250309202658_add_timer_end_to_tournaments.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddTimerEndToTournaments < ActiveRecord::Migration[7.0]
   def change
     add_column :tournaments, :timer_end, :datetime
diff --git a/db/migrate/20260422100000_create_team_action_lists.rb b/db/migrate/20260422100000_create_team_action_lists.rb
index fa7547d..0382dc7 100644
--- a/db/migrate/20260422100000_create_team_action_lists.rb
+++ b/db/migrate/20260422100000_create_team_action_lists.rb
@@ -13,7 +13,7 @@ class CreateTeamActionLists < ActiveRecord::Migration[7.0]
       t.timestamps
     end
 
-    add_index :team_action_lists, [:tournament_id, :key], unique: true
+    add_index :team_action_lists, %i[tournament_id key], unique: true
 
     create_table :team_action_items do |t|
       t.references :team_action_list, null: false, foreign_key: { on_delete: :cascade }, index: true
@@ -25,6 +25,6 @@ class CreateTeamActionLists < ActiveRecord::Migration[7.0]
       t.timestamps
     end
 
-    add_index :team_action_items, [:team_action_list_id, :team_id], unique: true
+    add_index :team_action_items, %i[team_action_list_id team_id], unique: true
   end
 end
diff --git a/db/migrate/20260423133000_add_timer_mode_to_tournaments.rb b/db/migrate/20260423133000_add_timer_mode_to_tournaments.rb
index 07f5ef2..35eb0c0 100644
--- a/db/migrate/20260423133000_add_timer_mode_to_tournaments.rb
+++ b/db/migrate/20260423133000_add_timer_mode_to_tournaments.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddTimerModeToTournaments < ActiveRecord::Migration[7.0]
   def change
     add_column :tournaments, :timer_mode, :string
diff --git a/db/migrate/20260430120000_add_sync_auth_token_digest_to_tournaments.rb b/db/migrate/20260430120000_add_sync_auth_token_digest_to_tournaments.rb
index 9e514f6..677ef80 100644
--- a/db/migrate/20260430120000_add_sync_auth_token_digest_to_tournaments.rb
+++ b/db/migrate/20260430120000_add_sync_auth_token_digest_to_tournaments.rb
@@ -8,9 +8,7 @@ class AddSyncAuthTokenDigestToTournaments < ActiveRecord::Migration[7.0]
   end
 
   def up
-    unless column_exists?(:tournaments, :sync_auth_token_digest)
-      add_column :tournaments, :sync_auth_token_digest, :string
-    end
+    add_column :tournaments, :sync_auth_token_digest, :string unless column_exists?(:tournaments, :sync_auth_token_digest)
 
     MigrationTournament.reset_column_information
     MigrationTournament
diff --git a/db/migrate/20260430121000_create_tournament_transaction_log_entries.rb b/db/migrate/20260430121000_create_tournament_transaction_log_entries.rb
index ed194c8..141b498 100644
--- a/db/migrate/20260430121000_create_tournament_transaction_log_entries.rb
+++ b/db/migrate/20260430121000_create_tournament_transaction_log_entries.rb
@@ -14,7 +14,7 @@ class CreateTournamentTransactionLogEntries < ActiveRecord::Migration[7.0]
     end
 
     add_index :tournament_transaction_log_entries,
-              [:tournament_id, :sequence],
+              %i[tournament_id sequence],
               unique: true,
               name: 'index_tournament_log_entries_on_tournament_and_sequence'
   end
diff --git a/e2e/lib/action_cable_client.rb b/e2e/lib/action_cable_client.rb
index 47a7be0..f3d9f80 100644
--- a/e2e/lib/action_cable_client.rb
+++ b/e2e/lib/action_cable_client.rb
@@ -11,7 +11,7 @@ module TurniereE2E
     ACTION_CABLE_PROTOCOLS = %w[actioncable-v1-json actioncable-unsupported].freeze
 
     def initialize(base_url:)
-      @base_url = base_url.sub(%r{/\z}, '')
+      @base_url = base_url.delete_suffix('/')
       @messages = Queue.new
       @closed = false
     end
@@ -19,7 +19,7 @@ module TurniereE2E
     def subscribe_team_action_lists!(tournament_id:)
       identifier = {
         channel: 'TournamentTeamActionListsChannel',
-        tournament_id: tournament_id
+        tournament_id:
       }.to_json
 
       subscribe!(identifier:) do |message|
@@ -30,7 +30,7 @@ module TurniereE2E
     def subscribe_timer!(tournament_id:)
       identifier = {
         channel: 'TournamentTimersChannel',
-        tournament_id: tournament_id
+        tournament_id:
       }.to_json
 
       subscribe!(identifier:) do |message|
@@ -41,8 +41,8 @@ module TurniereE2E
     def subscribe_beamer!(tournament_id:, beamer_name:)
       identifier = {
         channel: 'TournamentBeamersChannel',
-        tournament_id: tournament_id,
-        beamer_name: beamer_name
+        tournament_id:,
+        beamer_name:
       }.to_json
 
       subscribe!(identifier:) do |message|
@@ -78,31 +78,31 @@ module TurniereE2E
     end
 
     def wait_for_payload!(timeout: 20)
-      wait_for!(timeout: timeout) do |message|
+      wait_for!(timeout:) do |message|
         team_action_lists_payload_message?(message)
       end.fetch('message')
     end
 
     def wait_for_timer_payload!(timeout: 20)
-      wait_for!(timeout: timeout) do |message|
+      wait_for!(timeout:) do |message|
         timer_payload_message?(message)
       end.fetch('message')
     end
 
     def wait_for_beamer_payload!(timeout: 20)
-      wait_for!(timeout: timeout) do |message|
+      wait_for!(timeout:) do |message|
         beamer_payload_message?(message)
       end.fetch('message')
     end
 
     def wait_for_tournament_payload!(timeout: 20)
-      wait_for!(timeout: timeout) do |message|
+      wait_for!(timeout:) do |message|
         tournament_payload_message?(message)
       end.fetch('message')
     end
 
     def wait_for_matches_payload!(timeout: 20)
-      wait_for!(timeout: timeout) do |message|
+      wait_for!(timeout:) do |message|
         matches_payload_message?(message)
       end.fetch('message')
     end
@@ -135,7 +135,7 @@ module TurniereE2E
       driver.text(
         JSON.dump(
           command: 'subscribe',
-          identifier: identifier
+          identifier:
         )
       )
 
@@ -184,8 +184,8 @@ module TurniereE2E
     end
 
     def pump_until_open!(timeout: 10)
-      deadline = Time.now + timeout
-      while Time.now < deadline
+      deadline = monotonic_deadline(timeout)
+      while Process.clock_gettime(Process::CLOCK_MONOTONIC) < deadline
         read_from_socket(timeout: 0.5)
         return if driver.ready_state == 1
       end
@@ -194,14 +194,14 @@ module TurniereE2E
     end
 
     def wait_for!(timeout: 20)
-      deadline = Time.now + timeout
+      deadline = monotonic_deadline(timeout)
       loop do
         until @messages.empty?
           message = @messages.pop(true)
           return message if yield(message)
         end
 
-        raise "websocket message not received within #{timeout}s" if Time.now >= deadline
+        raise "websocket message not received within #{timeout}s" if Process.clock_gettime(Process::CLOCK_MONOTONIC) >= deadline
 
         read_from_socket(timeout: 0.5)
       rescue ThreadError
@@ -209,6 +209,10 @@ module TurniereE2E
       end
     end
 
+    def monotonic_deadline(timeout)
+      Process.clock_gettime(Process::CLOCK_MONOTONIC) + timeout
+    end
+
     def read_from_socket(timeout:)
       readable, = IO.select([socket], nil, nil, timeout)
       return if readable.nil?
diff --git a/e2e/lib/api_client.rb b/e2e/lib/api_client.rb
index 0fef340..6ea0198 100644
--- a/e2e/lib/api_client.rb
+++ b/e2e/lib/api_client.rb
@@ -19,7 +19,7 @@ module TurniereE2E
     attr_reader :base_url
 
     def initialize(base_url:)
-      @base_url = base_url.sub(%r{/\z}, '')
+      @base_url = base_url.delete_suffix('/')
       @auth_headers = {}
       @login_credentials = nil
     end
@@ -29,10 +29,10 @@ module TurniereE2E
         :post,
         '/users',
         body: {
-          email: email,
-          password: password,
+          email:,
+          password:,
           password_confirmation: password,
-          username: username
+          username:
         }
       )
       store_auth_headers!(response)
@@ -40,14 +40,14 @@ module TurniereE2E
     end
 
     def login!(email:, password:)
-      @login_credentials = { email: email, password: password }
+      @login_credentials = { email:, password: }
       @auth_headers = {}
       response = request(
         :post,
         '/users/sign_in',
         body: {
-          email: email,
-          password: password
+          email:,
+          password:
         }
       )
       store_auth_headers!(response)
@@ -59,19 +59,19 @@ module TurniereE2E
     end
 
     def get(path, params: nil, headers: {})
-      request(:get, path, params: params, headers: headers)
+      request(:get, path, params:, headers:)
     end
 
     def post(path, body: nil, params: nil, headers: {})
-      request(:post, path, body: body, params: params, headers: headers)
+      request(:post, path, body:, params:, headers:)
     end
 
     def patch(path, body: nil, params: nil, headers: {})
-      request(:patch, path, body: body, params: params, headers: headers)
+      request(:patch, path, body:, params:, headers:)
     end
 
     def delete(path, params: nil, headers: {})
-      request(:delete, path, params: params, headers: headers)
+      request(:delete, path, params:, headers:)
     end
 
     private
@@ -80,7 +80,7 @@ module TurniereE2E
       login!(**@login_credentials) if refresh_session && should_refresh_session?(method, path)
 
       uri = URI.parse("#{base_url}#{path}")
-      uri.query = URI.encode_www_form(params) if params && !params.empty?
+      uri.query = URI.encode_www_form(params) if params&.any?
 
       request_class = case method
                       when :get then Net::HTTP::Get
@@ -108,7 +108,8 @@ module TurniereE2E
       store_auth_headers!(result)
       if retry_on_unauthorized && result[:status] == 401 && can_reauthenticate?(path)
         login!(**@login_credentials)
-        return request(method, path, body: body, params: params, headers: headers, retry_on_unauthorized: false, refresh_session: false)
+        return request(method, path, body:, params:, headers:, retry_on_unauthorized: false,
+                                     refresh_session: false)
       end
       result
     end
diff --git a/e2e/lib/load_test_runner.rb b/e2e/lib/load_test_runner.rb
index ddcb77f..ea93da4 100644
--- a/e2e/lib/load_test_runner.rb
+++ b/e2e/lib/load_test_runner.rb
@@ -267,12 +267,8 @@ module TurniereE2E
 
     def websocket_failures(level)
       failures = []
-      if level.fetch(:errors).positive?
-        failures << "WS #{level.fetch(:clients)} clients: #{level.fetch(:errors)} failed"
-      end
-      if websocket_open_short?(level)
-        failures << "WS #{level.fetch(:clients)} clients: only #{level.fetch(:opened)} opened"
-      end
+      failures << "WS #{level.fetch(:clients)} clients: #{level.fetch(:errors)} failed" if level.fetch(:errors).positive?
+      failures << "WS #{level.fetch(:clients)} clients: only #{level.fetch(:opened)} opened" if websocket_open_short?(level)
       if websocket_metric_short?(level)
         failures << "WS #{level.fetch(:clients)} clients: metrics saw #{level.fetch(:connection_metric)} connections"
       end
diff --git a/e2e/lib/scenario_runner.rb b/e2e/lib/scenario_runner.rb
index cee171a..7d68af9 100644
--- a/e2e/lib/scenario_runner.rb
+++ b/e2e/lib/scenario_runner.rb
@@ -7,7 +7,7 @@ require 'uri'
 
 module TurniereE2E
   class ScenarioRunner
-    DEFAULT_PASSWORD = 'password123'.freeze
+    DEFAULT_PASSWORD = 'password123'
 
     attr_reader :client
 
@@ -36,19 +36,19 @@ module TurniereE2E
         timestamp: timer_response.fetch(:timestamp),
         timer_reason: timer_response.fetch(:timer_reason)
       }
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :timer_set
+      return checkpoint_result(session, tournament, checkpoints, stop_at) if stop_at == :timer_set
 
       upcoming_matches = get!(
         "/tournaments/#{tournament.fetch(:id)}/matches",
         params: { state: 'upcoming' }
       )
       checkpoints[:upcoming_group_matches] = { match_ids: upcoming_matches.map { |match| match.fetch(:id) } }
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :upcoming_group_matches
+      return checkpoint_result(session, tournament, checkpoints, stop_at) if stop_at == :upcoming_group_matches
 
       finish_group_stage_matches!(tournament)
       tournament = fetch_tournament!(tournament.fetch(:id))
       checkpoints[:groups_finished] = summarize_tournament(tournament)
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :groups_finished
+      return checkpoint_result(session, tournament, checkpoints, stop_at) if stop_at == :groups_finished
 
       statistics = get!("/tournaments/#{tournament.fetch(:id)}/statistics")
       checkpoints[:statistics] = {
@@ -60,12 +60,12 @@ module TurniereE2E
       finish_stage!(group_stage_of!(tournament).fetch(:id))
       tournament = fetch_tournament!(tournament.fetch(:id))
       checkpoints[:playoffs_created] = summarize_tournament(tournament)
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :playoffs_created
+      return checkpoint_result(session, tournament, checkpoints, stop_at) if stop_at == :playoffs_created
 
       run_playoffs_until_before_final!(tournament.fetch(:id))
       tournament = fetch_tournament!(tournament.fetch(:id))
       checkpoints[:before_final_finish_attempt] = summarize_tournament(tournament)
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :before_final_finish_attempt
+      return checkpoint_result(session, tournament, checkpoints, stop_at) if stop_at == :before_final_finish_attempt
 
       finish_attempt = finish_final_stage_matches!(tournament)
       tournament = fetch_tournament!(tournament.fetch(:id))
@@ -86,18 +86,27 @@ module TurniereE2E
       checkpoints = {
         created: summarize_tournament(tournament)
       }
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :created
+      if stop_at == :created
+        return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                      stop_at: stop_at)
+      end
 
       finish_group_stage_matches!(tournament)
       finish_stage!(group_stage_of!(fetch_tournament!(tournament.fetch(:id))).fetch(:id))
       tournament = fetch_tournament!(tournament.fetch(:id))
       checkpoints[:playoffs_created] = summarize_tournament(tournament)
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :playoffs_created
+      if stop_at == :playoffs_created
+        return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                      stop_at: stop_at)
+      end
 
       run_playoffs_until_before_final!(tournament.fetch(:id))
       tournament = fetch_tournament!(tournament.fetch(:id))
       checkpoints[:before_final_finish_attempt] = summarize_tournament(tournament)
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :before_final_finish_attempt
+      if stop_at == :before_final_finish_attempt
+        return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                      stop_at: stop_at)
+      end
 
       finish_attempt = finish_final_stage_matches!(tournament)
       tournament = fetch_tournament!(tournament.fetch(:id))
@@ -132,7 +141,10 @@ module TurniereE2E
         checkpoints[created_key] = summarize_tournament(tournament).merge(
           playoff_matchups: playoff_matchups(tournament)
         )
-        return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == created_key
+        if stop_at == created_key
+          return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                        stop_at: stop_at)
+        end
 
         next if index == rounds.size - 1
 
@@ -140,7 +152,10 @@ module TurniereE2E
         tournament = fetch_tournament!(tournament.fetch(:id))
         deleted_key = deleted_keys.fetch(index)
         checkpoints[deleted_key] = summarize_tournament(tournament)
-        return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == deleted_key
+        if stop_at == deleted_key
+          return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                        stop_at: stop_at)
+        end
       end
 
       result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at)
@@ -152,7 +167,10 @@ module TurniereE2E
       checkpoints = {
         created: summarize_tournament(tournament)
       }
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :created
+      if stop_at == :created
+        return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                      stop_at: stop_at)
+      end
 
       run_playoffs_until_complete!(tournament.fetch(:id))
       tournament = fetch_tournament!(tournament.fetch(:id))
@@ -170,7 +188,10 @@ module TurniereE2E
       checkpoints = {
         created: summarize_tournament(tournament)
       }
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :created
+      if stop_at == :created
+        return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                      stop_at: stop_at)
+      end
 
       group = group_stage_of!(tournament).fetch(:groups).first
       play_group_matches_with_explicit_scores!(group, group_direct_comparison_score_plan(case_name))
@@ -250,7 +271,10 @@ module TurniereE2E
       checkpoints = {
         created: summarize_tournament(tournament)
       }
-      return result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at) if stop_at == :created
+      if stop_at == :created
+        return result(session: session, tournament: tournament, checkpoints: checkpoints,
+                      stop_at: stop_at)
+      end
 
       profiled_show = fetch_tournament_profile!(tournament.fetch(:id))
       checkpoints[:profiled_show] = profiled_show
@@ -259,7 +283,7 @@ module TurniereE2E
     end
 
     def wait_for_healthcheck!(timeout_seconds: 30)
-      started_at = Time.now
+      started_at = Process.clock_gettime(Process::CLOCK_MONOTONIC)
       loop do
         begin
           response = client.get('/healthz')
@@ -268,7 +292,8 @@ module TurniereE2E
           nil
         end
 
-        raise "healthcheck did not become ready within #{timeout_seconds}s" if Time.now - started_at > timeout_seconds
+        elapsed = Process.clock_gettime(Process::CLOCK_MONOTONIC) - started_at
+        raise "healthcheck did not become ready within #{timeout_seconds}s" if elapsed > timeout_seconds
 
         sleep 0.5
       end
@@ -282,7 +307,7 @@ module TurniereE2E
       unique = SecureRandom.hex(6)
       email = "e2e-#{unique}@example.com"
       username = "e2e-#{unique}"
-      response = client.register!(email: email, password: DEFAULT_PASSWORD, username: username)
+      client.register!(email: email, password: DEFAULT_PASSWORD, username: username)
       return { email: email, username: username } if client.authenticated?
 
       login_response = client.login!(email: email, password: DEFAULT_PASSWORD)
@@ -350,9 +375,12 @@ module TurniereE2E
     def run_playoffs_until_before_final!(tournament_id)
       loop do
         tournament = fetch_tournament!(tournament_id)
-        playable_matches = playoff_matches(tournament).reject { |match| match.fetch(:stage_level) == 0 }
-                                                  .select { |match| match.fetch(:state) == 'not_started' }
-                                                  .sort_by { |match| [-match.fetch(:stage_level), match.fetch(:position)] }
+        playable_matches = playoff_matches(tournament).reject { |match| match.fetch(:stage_level).zero? }
+                                                      .select { |match| match.fetch(:state) == 'not_started' }
+                                                      .sort_by do |match|
+          [-match.fetch(:stage_level),
+           match.fetch(:position)]
+        end
 
         break if playable_matches.empty?
 
@@ -366,7 +394,10 @@ module TurniereE2E
       loop do
         tournament = fetch_tournament!(tournament_id)
         playable_matches = playoff_matches(tournament).select { |match| match.fetch(:state) == 'not_started' }
-                                                  .sort_by { |match| [-match.fetch(:stage_level), match.fetch(:position)] }
+                                                      .sort_by do |match|
+          [-match.fetch(:stage_level),
+           match.fetch(:position)]
+        end
         break if playable_matches.empty?
 
         playable_matches.each do |match|
@@ -390,7 +421,9 @@ module TurniereE2E
       expect_status!(finished, expected_finish_status, "finish match #{match.fetch(:id)}")
       if expected_finish_error
         actual_error = finished.fetch(:json).fetch(:error)
-        raise "expected finish error #{expected_finish_error.inspect}, got #{actual_error.inspect}" unless actual_error == expected_finish_error
+        unless actual_error == expected_finish_error
+          raise "expected finish error #{expected_finish_error.inspect}, got #{actual_error.inspect}"
+        end
       end
 
       {
@@ -418,7 +451,9 @@ module TurniereE2E
       expect_status!(finished, expected_finish_status, "finish match #{match.fetch(:id)}")
       if expected_finish_error
         actual_error = finished.fetch(:json).fetch(:error)
-        raise "expected finish error #{expected_finish_error.inspect}, got #{actual_error.inspect}" unless actual_error == expected_finish_error
+        unless actual_error == expected_finish_error
+          raise "expected finish error #{expected_finish_error.inspect}, got #{actual_error.inspect}"
+        end
       end
 
       {
@@ -481,7 +516,9 @@ module TurniereE2E
     end
 
     def final_stage_matches_of!(tournament)
-      final_stage = tournament.fetch(:stages).find { |stage| stage.fetch(:level) == 0 } || raise('final stage not found')
+      final_stage = tournament.fetch(:stages).find do |stage|
+        stage.fetch(:level).zero?
+      end || raise('final stage not found')
       attach_stage_level(final_stage).fetch(:matches).sort_by { |match| match.fetch(:position) }
     end
 
@@ -496,7 +533,9 @@ module TurniereE2E
 
       {
         status: 200,
-        finished_match_ids: final_stage_matches_of!(fetch_tournament!(tournament.fetch(:id))).map { |match| match.fetch(:id) }
+        finished_match_ids: final_stage_matches_of!(fetch_tournament!(tournament.fetch(:id))).map do |match|
+          match.fetch(:id)
+        end
       }
     end
 
@@ -574,7 +613,7 @@ module TurniereE2E
 
     def create_group_stage_payload(group_count:, teams_per_group:, playoff_teams_amount:)
       teams = group_count.times.flat_map do |group_index|
-        teams_per_group.times.map do |seed_index|
+        Array.new(teams_per_group) do |seed_index|
           {
             name: "G#{group_index + 1}-S#{seed_index + 1}",
             group: group_index
@@ -626,7 +665,7 @@ module TurniereE2E
         name: "HTTP E2E Playoff Only #{team_count} #{SecureRandom.hex(3)}",
         description: 'HTTP lifecycle E2E tournament',
         public: false,
-        teams: team_count.times.map { |index| { name: "G0-S#{index + 1}" } }
+        teams: Array.new(team_count) { |index| { name: "G0-S#{index + 1}" } }
       }
     end
 
@@ -739,7 +778,7 @@ module TurniereE2E
     end
 
     def parse_server_timing(header)
-      return {} if header.nil? || header.empty?
+      return {} if header.to_s.empty?
 
       header.split(',').each_with_object({}) do |entry, sections|
         name, duration = entry.strip.match(/\A([^;]+);dur=([0-9.]+)\z/)&.captures
@@ -758,6 +797,10 @@ module TurniereE2E
       }
     end
 
+    def checkpoint_result(session, tournament, checkpoints, stop_at)
+      result(session: session, tournament: tournament, checkpoints: checkpoints, stop_at: stop_at)
+    end
+
     def expect_status!(response, expected_status, action)
       return if response.fetch(:status) == expected_status
 
diff --git a/e2e/load_test.rb b/e2e/load_test.rb
index 1ca9e07..def4057 100755
--- a/e2e/load_test.rb
+++ b/e2e/load_test.rb
@@ -73,32 +73,31 @@ result = runner.run
 
 if options[:format] == 'json'
   puts JSON.pretty_generate(result)
-  exit
-end
+else
+  puts "Load test base_url=#{result.fetch(:base_url)} tournament_id=#{result.dig(:tournament, :id)}"
 
-puts "Load test base_url=#{result.fetch(:base_url)} tournament_id=#{result.dig(:tournament, :id)}"
+  result.fetch(:http).each do |level|
+    puts(
+      "HTTP #{level.fetch(:clients)} clients: " \
+      "#{level.fetch(:ok)}/#{level.fetch(:requests)} ok, errors=#{level.fetch(:errors)}, " \
+      "p50=#{level.fetch(:p50_ms)}ms, p95=#{level.fetch(:p95_ms)}ms, " \
+      "max=#{level.fetch(:max_ms)}ms, rps=#{level.fetch(:requests_per_second)}"
+    )
+  end
 
-result.fetch(:http).each do |level|
+  result.fetch(:websocket).each do |level|
+    puts(
+      "WS #{level.fetch(:clients)} clients: " \
+      "opened=#{level.fetch(:opened)}, errors=#{level.fetch(:errors)}, " \
+      "p50_open=#{level.fetch(:p50_open_ms)}ms, p95_open=#{level.fetch(:p95_open_ms)}ms, " \
+      "connections_metric=#{level.fetch(:connection_metric)}"
+    )
+  end
+
+  metrics = result.fetch(:metrics)
   puts(
-    "HTTP #{level.fetch(:clients)} clients: " \
-    "#{level.fetch(:ok)}/#{level.fetch(:requests)} ok, errors=#{level.fetch(:errors)}, " \
-    "p50=#{level.fetch(:p50_ms)}ms, p95=#{level.fetch(:p95_ms)}ms, " \
-    "max=#{level.fetch(:max_ms)}ms, rps=#{level.fetch(:requests_per_second)}"
+    "Metrics: action_cable_connections=#{metrics.fetch(:action_cable_connections)}, " \
+    "action_cable_connections_total=#{metrics.fetch(:action_cable_connections_total)}, " \
+    "ruby_threads=#{metrics.fetch(:ruby_threads)}"
   )
 end
-
-result.fetch(:websocket).each do |level|
-  puts(
-    "WS #{level.fetch(:clients)} clients: " \
-    "opened=#{level.fetch(:opened)}, errors=#{level.fetch(:errors)}, " \
-    "p50_open=#{level.fetch(:p50_open_ms)}ms, p95_open=#{level.fetch(:p95_open_ms)}ms, " \
-    "connections_metric=#{level.fetch(:connection_metric)}"
-  )
-end
-
-metrics = result.fetch(:metrics)
-puts(
-  "Metrics: action_cable_connections=#{metrics.fetch(:action_cable_connections)}, " \
-  "action_cable_connections_total=#{metrics.fetch(:action_cable_connections_total)}, " \
-  "ruby_threads=#{metrics.fetch(:ruby_threads)}"
-)
diff --git a/lib/local/request_profiling.rb b/lib/local/request_profiling.rb
index d231eea..1f8cf9f 100644
--- a/lib/local/request_profiling.rb
+++ b/lib/local/request_profiling.rb
@@ -28,7 +28,7 @@ module Local
         result = yield
       end
       duration = (Process.clock_gettime(Process::CLOCK_MONOTONIC) - started_at) * 1000.0
-      @measurements << { name: name, duration: duration.round(1), query_count: query_count }
+      @measurements << { name:, duration: duration.round(1), query_count: }
       result
     end
 
diff --git a/script/e2e_scenarios.rb b/script/e2e_scenarios.rb
old mode 100644
new mode 100755
index 45da011..c35102b
--- a/script/e2e_scenarios.rb
+++ b/script/e2e_scenarios.rb
@@ -5,6 +5,11 @@ require 'json'
 require 'optparse'
 require_relative '../e2e/lib/scenario_runner'
 
+def fail_with(message)
+  warn message
+  raise SystemExit, 1
+end
+
 options = {
   base_url: ENV.fetch('TURNIERE_E2E_BASE_URL', 'http://127.0.0.1:3000'),
   stop_at: nil,
@@ -12,9 +17,9 @@ options = {
   group_count: 4,
   teams_per_group: 4,
   playoff_teams_amount: 8,
-  email: ENV['TURNIERE_E2E_EMAIL'],
-  password: ENV['TURNIERE_E2E_PASSWORD'],
-  username: ENV['TURNIERE_E2E_USERNAME']
+  email: ENV.fetch('TURNIERE_E2E_EMAIL', nil),
+  password: ENV.fetch('TURNIERE_E2E_PASSWORD', nil),
+  username: ENV.fetch('TURNIERE_E2E_USERNAME', nil)
 }
 
 OptionParser.new do |parser|
@@ -22,9 +27,15 @@ OptionParser.new do |parser|
 
   parser.on('--base-url URL', 'API base URL') { |value| options[:base_url] = value }
   parser.on('--stop-at CHECKPOINT', 'Stop scenario at a named checkpoint') { |value| options[:stop_at] = value.to_sym }
-  parser.on('--team-count COUNT', Integer, 'Team count for playoff_only scenario') { |value| options[:team_count] = value }
-  parser.on('--group-count COUNT', Integer, 'Group count for group-stage scenarios') { |value| options[:group_count] = value }
-  parser.on('--teams-per-group COUNT', Integer, 'Teams per group for group-stage scenarios') { |value| options[:teams_per_group] = value }
+  parser.on('--team-count COUNT', Integer, 'Team count for playoff_only scenario') do |value|
+    options[:team_count] = value
+  end
+  parser.on('--group-count COUNT', Integer, 'Group count for group-stage scenarios') do |value|
+    options[:group_count] = value
+  end
+  parser.on('--teams-per-group COUNT', Integer, 'Teams per group for group-stage scenarios') do |value|
+    options[:teams_per_group] = value
+  end
   parser.on('--playoff-teams-amount COUNT', Integer, 'Playoff teams amount for group-stage scenarios') do |value|
     options[:playoff_teams_amount] = value
   end
@@ -33,7 +44,9 @@ OptionParser.new do |parser|
   parser.on('--username USERNAME', 'Confirmed E2E user username') { |value| options[:username] = value }
 end.parse!
 
-scenario = ARGV.shift or abort('Missing scenario name')
+scenario = ARGV.shift
+fail_with('Missing scenario name') if scenario.nil?
+
 runner = TurniereE2E::ScenarioRunner.new(
   base_url: options[:base_url],
   email: options[:email],
@@ -58,7 +71,7 @@ result = case scenario
              stop_at: options[:stop_at] || :profiled_show
            )
          else
-           abort("Unknown scenario #{scenario.inspect}")
+           fail_with("Unknown scenario #{scenario.inspect}")
          end
 
 puts JSON.pretty_generate(result)
diff --git a/script/wait_for_http.rb b/script/wait_for_http.rb
old mode 100644
new mode 100755
diff --git a/tasks.py b/tasks.py
index d8c02e0..e0b3dec 100644
--- a/tasks.py
+++ b/tasks.py
@@ -57,6 +57,18 @@ BLACKBOX_MAILGUN_API_KEY = "blackbox-test-api-key"
 BLACKBOX_MAILGUN_DOMAIN = "blackbox.example.com"
 SPEC_ROOT = Path("spec")
 E2E_SPEC_ROOT = SPEC_ROOT / "e2e" / "http"
+LINT_TARGETS = (
+    "Gemfile",
+    "Rakefile",
+    "config.ru",
+    "app",
+    "config",
+    "db/migrate",
+    "db/seeds.rb",
+    "e2e",
+    "lib",
+    "script",
+)
 ROOT = Path(__file__).resolve().parent
 DB_DIR = ROOT / "db"
 GEMFILE_LOCK_PATH = ROOT / "Gemfile.lock"
@@ -802,7 +814,7 @@ def test_shard(c, node_index=1, node_total=8, dry_run=False):
 @task
 def lint(c):
     """Run RuboCop."""
-    c.run(_bundle_exec("rubocop"), pty=True)
+    c.run(_bundle_exec("rubocop", *LINT_TARGETS, "--cache", "false"), pty=True)
 
 
 @task(name="bootstrap-dev-user")