diff --git a/.env.test b/.env.test
index c0a492d..dc7a407 100644
--- a/.env.test
+++ b/.env.test
@@ -5,7 +5,7 @@ PUMA_MIN_THREADS=2
 PUMA_MAX_THREADS=5
 WEB_CONCURRENCY=0
 
-DATABASE_HOST=postgres
+DATABASE_HOST=database
 DATABASE_NAME=shizoid
 DATABASE_PASSWORD=WoZ7w2e3
 DATABASE_PORT=5432
@@ -13,7 +13,7 @@ DATABASE_USERNAME=shizoid
 DB_POOL_SIZE=40
 
 SIDEKIQ_CONCURRENCY=25
-REDIS_HOST=redis
+REDIS_HOST=cache
 REDIS_PORT=6379
 REDIS_SIDEKIQ_DB=1
 REDIS_CONTEXT_DB=2
diff --git a/.github/workflows/shizoid.yml b/.github/workflows/shizoid.yml
index 01a353f..100d4bf 100644
--- a/.github/workflows/shizoid.yml
+++ b/.github/workflows/shizoid.yml
@@ -7,7 +7,7 @@ jobs:
     name: Perform specs
     runs-on: ubuntu-latest
     services:
-      postgres:
+      database:
         image: postgres:alpine
         env:
           POSTGRES_USER: shizoid
@@ -20,7 +20,7 @@ jobs:
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
-      redis:
+      cache:
         image: redis:alpine
         ports:
           - 6379:6379
@@ -31,7 +31,7 @@ jobs:
       - name: 'Setup Ruby'
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0
+          ruby-version: 3.3.0
       - name: "Install required system packages"
         run: sudo apt-get update -y && sudo apt-get install openssh-client rsync libpq-dev cmake -y
       - name: "Bundle install"
diff --git a/.rubocop.yml b/.rubocop.yml
index b7f7ab9..05ea57b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -14,6 +14,18 @@ AllCops:
 Documentation:
   Enabled: false
 
+Style/StringLiterals:
+  Exclude:
+    - 'config/application.rb'
+    - 'config/boot.rb'
+    - 'config/environments/*'
+    - 'config/environment.rb'
+    - 'config/initializers/backtrace_silencers.rb'
+    - 'config.ru'
+
+RSpec/NestedGroups:
+  Max: 4
+
 Metrics/LineLength:
   Max: 130
 
@@ -29,13 +41,5 @@ Metrics/BlockLength:
     - post
     - delete
 
-Style/NumericPredicate:
-  Exclude:
-    - spec/**/*
-
-Style/HashSyntax:
-  Enabled: true
-  EnforcedStyle: ruby19
-
 Metrics/AbcSize:
   Max: 30
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index c91ccd1..df5b769 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,149 +1,36 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2021-10-23 16:16:34 UTC using RuboCop version 1.22.2.
+# on 2024-01-20 09:54:15 UTC using RuboCop version 1.60.1.
 # 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
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, IndentationWidth.
-# SupportedStyles: with_first_argument, with_fixed_indentation
-Layout/ArgumentAlignment:
-  Exclude:
-    - 'spec/processors/message_processor/eightball_spec.rb'
-
 # Offense count: 1
-# Cop supports --auto-correct.
-Layout/EmptyLineAfterGuardClause:
+# Configuration parameters: AllowedMethods, AllowedPatterns, CountRepeatedAttributes, Max.
+Metrics/AbcSize:
   Exclude:
     - 'app/models/pair.rb'
 
-# Offense count: 4
-# Cop supports --auto-correct.
-Layout/EmptyLines:
-  Exclude:
-    - 'config/application.rb'
-    - 'config/environments/development.rb'
-    - 'spec/models/pair_spec.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: AllowForAlignment, AllowBeforeTrailingComments, ForceEqualSignAlignment.
-Layout/ExtraSpacing:
-  Exclude:
-    - 'config/environments/production.rb'
-    - 'db/migrate/20170816162384_create_singles.rb'
-    - 'db/migrate/20210925130635_remove_urls_and_singles.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Layout/LeadingEmptyLines:
-  Exclude:
-    - 'spec/rails_helper.rb'
-
-# Offense count: 4
-# Cop supports --auto-correct.
-# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
-# URISchemes: http, https
-Layout/LineLength:
-  Max: 133
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: AllowForAlignment, EnforcedStyleForExponentOperator.
-# SupportedStylesForExponentOperator: space, no_space
-Layout/SpaceAroundOperators:
-  Exclude:
-    - 'config/environments/production.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
-# SupportedStyles: space, no_space
-# SupportedStylesForEmptyBraces: space, no_space
-Layout/SpaceBeforeBlockBraces:
-  Exclude:
-    - 'spec/models/pair_spec.rb'
-
-# Offense count: 10
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBrackets.
-# SupportedStyles: space, no_space, compact
-# SupportedStylesForEmptyBrackets: space, no_space
-Layout/SpaceInsideArrayLiteralBrackets:
-  Exclude:
-    - 'config/environments/production.rb'
-    - 'db/migrate/20170815155843_create_pairs.rb'
-    - 'db/migrate/20170816162384_create_singles.rb'
-    - 'db/migrate/20171104065321_create_data_banks.rb'
-
-# Offense count: 6
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces, SpaceBeforeBlockParameters.
-# SupportedStyles: space, no_space
-# SupportedStylesForEmptyBraces: space, no_space
-Layout/SpaceInsideBlockBraces:
-  Exclude:
-    - 'lib/tasks/databank.rake'
-    - 'spec/models/pair_spec.rb'
-    - 'spec/processors/message_processor/me_spec.rb'
-
 # Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces.
-# SupportedStyles: space, no_space, compact
-# SupportedStylesForEmptyBraces: space, no_space
-Layout/SpaceInsideHashLiteralBraces:
-  Exclude:
-    - 'app/models/word.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: space, compact, no_space
-Layout/SpaceInsideParens:
-  Exclude:
-    - 'db/migrate/20171028053628_remove_one_world_sentences.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: final_newline, final_blank_line
-Layout/TrailingEmptyLines:
-  Exclude:
-    - 'config/application.rb'
-
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: IgnoreEmptyBlocks, AllowUnusedKeywordArguments.
-Lint/UnusedBlockArgument:
+# Configuration parameters: CountComments, Max, CountAsOne, AllowedMethods, AllowedPatterns, inherit_mode.
+# AllowedMethods: refine
+Metrics/BlockLength:
   Exclude:
-    - 'lib/tasks/databank.rake'
-
-# Offense count: 1
-# Configuration parameters: IgnoredMethods, CountRepeatedAttributes.
-Metrics/AbcSize:
-  Max: 36
+    - 'lib/tasks/database.rake'
 
 # Offense count: 3
-# Configuration parameters: CountComments, CountAsOne, ExcludedMethods, IgnoredMethods.
-Metrics/BlockLength:
-  Max: 127
-
-# Offense count: 2
-# Configuration parameters: IgnoredMethods.
+# Configuration parameters: AllowedMethods, AllowedPatterns.
 Metrics/CyclomaticComplexity:
   Max: 9
 
-# Offense count: 6
-# Configuration parameters: CountComments, CountAsOne, ExcludedMethods, IgnoredMethods.
+# Offense count: 13
+# Configuration parameters: CountComments, CountAsOne, AllowedMethods, AllowedPatterns.
 Metrics/MethodLength:
   Max: 23
 
-# Offense count: 1
-# Configuration parameters: IgnoredMethods.
+# Offense count: 2
+# Configuration parameters: AllowedMethods, AllowedPatterns.
 Metrics/PerceivedComplexity:
   Max: 9
 
@@ -152,22 +39,13 @@ Naming/AccessorMethodName:
   Exclude:
     - 'spec/support/web_mocks/telegram.rb'
 
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: SkipBlocks, EnforcedStyle.
-# SupportedStyles: described_class, explicit
-RSpec/DescribedClass:
-  Exclude:
-    - 'spec/models/pair_spec.rb'
-    - 'spec/models/word_spec.rb'
-
 # Offense count: 4
 # Configuration parameters: CountAsOne.
 RSpec/ExampleLength:
-  Max: 9
+  Max: 11
 
 # Offense count: 7
-# Cop supports --auto-correct.
+# This cop supports safe autocorrection (--autocorrect).
 # Configuration parameters: Include.
 # Include: spec/factories.rb, spec/factories/**/*.rb, features/support/factories/**/*.rb
 RSpec/FactoryBot/FactoryClassName:
@@ -180,14 +58,12 @@ RSpec/FactoryBot/FactoryClassName:
     - 'spec/factories/telegram/user.rb'
     - 'spec/factories/user.rb'
 
-# Offense count: 4
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: is_expected, should
-RSpec/ImplicitExpect:
+# Offense count: 1
+# Configuration parameters: Include, CustomTransform, IgnoreMethods, SpecSuffixOnly.
+# Include: **/*_spec*rb*, **/spec/**/*
+RSpec/FilePath:
   Exclude:
-    - 'spec/models/pair_spec.rb'
-    - 'spec/models/user_spec.rb'
+    - 'spec/processors/concerns/processor_spec.rb'
 
 # Offense count: 7
 RSpec/MessageChain:
@@ -202,19 +78,13 @@ RSpec/MessageChain:
 RSpec/MultipleExpectations:
   Max: 3
 
-# Offense count: 46
+# Offense count: 75
 # Configuration parameters: AllowSubject.
 RSpec/MultipleMemoizedHelpers:
   Max: 13
 
-# Offense count: 4
-RSpec/RepeatedExample:
-  Exclude:
-    - 'spec/processors/message_processor/start_spec.rb'
-    - 'spec/processors/message_processor/stop_spec.rb'
-
 # Offense count: 7
-# Cop supports --auto-correct.
+# This cop supports safe autocorrection (--autocorrect).
 RSpec/SingleArgumentMessageChain:
   Exclude:
     - 'spec/controllers/webhooks_controller_spec.rb'
@@ -228,21 +98,6 @@ RSpec/StubbedMock:
   Exclude:
     - 'spec/processors/update_processor_spec.rb'
 
-# Offense count: 3
-# Cop supports --auto-correct.
-# Configuration parameters: NilOrEmpty, NotPresent, UnlessPresent.
-Rails/Blank:
-  Exclude:
-    - 'lib/tasks/databank.rake'
-
-# Offense count: 2
-# Configuration parameters: Database, Include.
-# SupportedDatabases: mysql, postgresql
-# Include: db/migrate/*.rb
-Rails/BulkChangeTable:
-  Exclude:
-    - 'db/migrate/20180203063658_add_dates_to_chat.rb'
-
 # Offense count: 9
 # Configuration parameters: Include.
 # Include: db/migrate/*.rb
@@ -258,27 +113,18 @@ Rails/CreateTableWithTimestamps:
     - 'db/migrate/20170817161038_create_winners.rb'
     - 'db/migrate/20171104065321_create_data_banks.rb'
 
-# Offense count: 4
-# Configuration parameters: EnforcedStyle, AllowToTime.
-# SupportedStyles: strict, flexible
-Rails/Date:
-  Exclude:
-    - 'app/models/winner.rb'
-    - 'app/processors/message_processor/eightball.rb'
-
-# Offense count: 4
+# Offense count: 3
 # Configuration parameters: EnforcedStyle.
 # SupportedStyles: slashes, arguments
 Rails/FilePath:
   Exclude:
-    - 'config/environments/development.rb'
     - 'config/initializers/locale.rb'
     - 'lib/tasks/database.rake'
     - 'spec/rails_helper.rb'
 
 # Offense count: 1
 # Configuration parameters: Include.
-# Include: db/migrate/*.rb
+# Include: db/**/*.rb
 Rails/ReversibleMigration:
   Exclude:
     - 'db/migrate/20180211095834_fix_chat_timestamps.rb'
@@ -292,103 +138,28 @@ Rails/SkipsModelValidations:
     - 'app/models/word.rb'
     - 'db/migrate/20170917105603_persist_chat_i_ds.rb'
 
-# Offense count: 2
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: strict, flexible
-Rails/TimeZone:
-  Exclude:
-    - 'db/migrate/20180203063658_add_dates_to_chat.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: always, conditionals
-Style/AndOr:
-  Exclude:
-    - 'lib/tasks/database.rake'
-
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: compact, expanded
-Style/EmptyMethod:
-  Exclude:
-    - 'app/processors/message_processor/databank.rb'
-    - 'app/workers/covid_worker.rb'
-
 # Offense count: 1
-# Cop supports --auto-correct.
+# This cop supports unsafe autocorrection (--autocorrect-all).
 Style/GlobalStdStream:
   Exclude:
     - 'config/environments/production.rb'
 
-# Offense count: 1
-# Configuration parameters: MinBranchesCount.
-Style/HashLikeCase:
+# This cop supports safe autocorrection (--autocorrect).
+# Configuration parameters: EnforcedStyle, AllowInnerSlashes.
+# SupportedStyles: slashes, percent_r, mixed
+Style/RegexpLiteral:
   Exclude:
-    - 'lib/tasks/database.rake'
+    - 'Guardfile'
 
 # Offense count: 2
-# Cop supports --auto-correct.
-Style/KeywordParametersOrder:
-  Exclude:
-    - 'app/models/pair.rb'
-
-# Offense count: 1
-# Cop supports --auto-correct.
-Style/Not:
-  Exclude:
-    - 'lib/tasks/database.rake'
-
-# Offense count: 3
-# Cop supports --auto-correct.
+# This cop supports unsafe autocorrection (--autocorrect-all).
 Style/SlicingWithRange:
   Exclude:
-    - 'spec/processors/message_processor/base_processor_spec.rb'
     - 'spec/processors/message_processor/me_spec.rb'
     - 'spec/processors/message_processor/say_spec.rb'
 
 # Offense count: 1
-# Cop supports --auto-correct.
-# Configuration parameters: Mode.
-Style/StringConcatenation:
-  Exclude:
-    - 'lib/tasks/database.rake'
-
-# Offense count: 5
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, ConsistentQuotesInMultiline.
-# SupportedStyles: single_quotes, double_quotes
-Style/StringLiterals:
-  Exclude:
-    - 'config.ru'
-    - 'config/environments/production.rb'
-    - 'config/initializers/backtrace_silencers.rb'
-    - 'lib/tasks/databank.rake'
-    - 'spec/factories/telegram/message.rb'
-
-# Offense count: 7
-# Cop supports --auto-correct.
-# Configuration parameters: EnforcedStyle, MinSize.
-# SupportedStyles: percent, brackets
-Style/SymbolArray:
-  Exclude:
-    - 'config/initializers/filter_parameter_logging.rb'
-    - 'db/migrate/20170815155843_create_pairs.rb'
-    - 'db/migrate/20170816162384_create_singles.rb'
-    - 'db/migrate/20171104065321_create_data_banks.rb'
-    - 'lib/tasks/databank.rake'
-
-# Offense count: 1
-# Cop supports --auto-correct.
+# This cop supports safe autocorrection (--autocorrect).
 Style/WhileUntilDo:
   Exclude:
     - 'app/models/pair.rb'
-
-# Offense count: 4
-# Cop supports --auto-correct.
-# Configuration parameters: AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
-# URISchemes: http, https
-Layout/LineLength:
-  Max: 133
diff --git a/Gemfile b/Gemfile
index 01f9032..fe92544 100644
--- a/Gemfile
+++ b/Gemfile
@@ -24,8 +24,10 @@ group :development, :test do
   gem 'factory_bot_rails'
   gem 'ffaker'
   gem 'guard'
-  gem 'guard-rake'
-  gem 'guard-rspec'
+  gem 'guard-bundler', require: false
+  gem 'guard-rake', require: false
+  gem 'guard-rspec', require: false
+  gem 'guard-rubocop', require: false
   gem 'listen'
   gem 'rack-test'
   gem 'rspec'
diff --git a/Gemfile.lock b/Gemfile.lock
index 997f50e..fed4bd9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -153,6 +153,10 @@ GEM
       pry (>= 0.13.0)
       shellany (~> 0.0)
       thor (>= 0.18.1)
+    guard-bundler (3.0.1)
+      bundler (>= 2.1, < 3)
+      guard (~> 2.2)
+      guard-compat (~> 1.1)
     guard-compat (1.2.1)
     guard-rake (1.0.0)
       guard
@@ -161,6 +165,9 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
+    guard-rubocop (1.5.0)
+      guard (~> 2.0)
+      rubocop (< 2.0)
     hashdiff (1.0.1)
     i18n (1.10.0)
       concurrent-ruby (~> 1.0)
@@ -168,6 +175,8 @@ GEM
     io-console (0.5.11)
     irb (1.4.1)
       reline (>= 0.3.0)
+    json (2.7.1)
+    language_server-protocol (3.17.0.3)
     listen (3.7.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -205,9 +214,10 @@ GEM
     notiffany (0.1.3)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    parallel (1.22.1)
-    parser (3.1.2.0)
+    parallel (1.24.0)
+    parser (3.3.0.4)
       ast (~> 2.4.1)
+      racc
     pg (1.3.5)
     pry (0.14.1)
       coderay (~> 1.1)
@@ -252,10 +262,10 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     redis (4.6.0)
-    regexp_parser (2.5.0)
+    regexp_parser (2.9.0)
     reline (0.3.1)
       io-console (~> 0.5)
-    rexml (3.2.5)
+    rexml (3.2.6)
     rspec (3.11.0)
       rspec-core (~> 3.11.0)
       rspec-expectations (~> 3.11.0)
@@ -280,17 +290,19 @@ GEM
       rspec-core (~> 3.0, >= 3.0.0)
       sidekiq (>= 2.4.0)
     rspec-support (3.11.0)
-    rubocop (1.30.1)
+    rubocop (1.60.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
-      parser (>= 3.1.0.0)
+      parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.18.0, < 2.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.18.0)
-      parser (>= 3.1.1.0)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
     rubocop-performance (1.14.1)
       rubocop (>= 1.7.0, < 2.0)
       rubocop-ast (>= 0.4.0)
@@ -300,7 +312,7 @@ GEM
       rubocop (>= 1.7.0, < 2.0)
     rubocop-rspec (2.11.1)
       rubocop (~> 1.19)
-    ruby-progressbar (1.11.0)
+    ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
     sentry-rails (5.3.1)
       railties (>= 5.0)
@@ -339,7 +351,7 @@ GEM
     timeout (0.3.0)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.1.0)
+    unicode-display_width (2.5.0)
     virtus (2.0.0)
       axiom-types (~> 0.1)
       coercible (~> 1.0)
@@ -364,8 +376,10 @@ DEPENDENCIES
   faraday
   ffaker
   guard
+  guard-bundler
   guard-rake
   guard-rspec
+  guard-rubocop
   listen
   pg
   puma
@@ -393,6 +407,3 @@ DEPENDENCIES
 
 RUBY VERSION
    ruby 3.3.0p0
-
-BUNDLED WITH
-   2.3.7
diff --git a/Guardfile b/Guardfile
index c11ca6a..0c1cf40 100644
--- a/Guardfile
+++ b/Guardfile
@@ -1,5 +1,15 @@
 # frozen_string_literal: true
 
+guard :bundler do
+  watch('Gemfile')
+  watch('Gemfile.lock')
+end
+
+guard :rubocop do
+  watch(%r{.+\.rb$})
+  watch(%r{(?:.+/)?\.rubocop\.yml$}) { |m| File.dirname(m[0]) }
+end
+
 guard :rspec, cmd: 'bundle exec rspec' do
   require 'guard/rspec/dsl'
   dsl = Guard::RSpec::Dsl.new(self)
@@ -17,8 +27,6 @@ guard :rspec, cmd: 'bundle exec rspec' do
   dsl.watch_spec_files_for(rails.views)
 
   watch(rails.controllers) { |m| [rspec.spec.call("controllers/#{m[1]}_controller")] }
-  watch(rails.controllers) { |m| [rspec.spec.call("request/#{m[1]}")] }
-
   watch(rails.spec_helper)     { rspec.spec_dir }
   watch(rails.app_controller)  { "#{rspec.spec_dir}/controllers" }
 end
diff --git a/app/models/chat.rb b/app/models/chat.rb
index ea78c80..c5c9872 100644
--- a/app/models/chat.rb
+++ b/app/models/chat.rb
@@ -11,8 +11,6 @@ class Chat < ApplicationRecord
   scope :not_personal, -> { where.not(kind: 'private') }
   scope :with_winners, -> { where.not(winner: nil) }
 
-  enum covid_region: CovidStat.regions
-
   def winner_enabled?
     winner.present?
   end
@@ -51,10 +49,6 @@ def disable!
     update!(active_at: nil)
   end
 
-  def casbanhammer?
-    casbanhammer_at.present?
-  end
-
   def self.learn(message)
     chat_payload = message.chat
     chat = Chat.find_or_initialize_by(telegram_id: chat_payload.id)
@@ -69,7 +63,7 @@ def answer_randomly?(additional = 0)
   end
 
   def generate_reply(words)
-    Pair.build_sentence(chat: self, words: words) || Pair.build_sentence(chat: self, words_ids: context)
+    Pair.build_sentence(chat: self, words:) || Pair.build_sentence(chat: self, words_ids: context)
   end
 
   def generate_story
diff --git a/app/models/covid_stat.rb b/app/models/covid_stat.rb
deleted file mode 100644
index 7d4b35f..0000000
--- a/app/models/covid_stat.rb
+++ /dev/null
@@ -1,88 +0,0 @@
-# frozen_string_literal: true
-
-class CovidStat < ApplicationRecord
-  enum region: {
-    ALL: 0,
-    AD: 2, ALT: 3, AMU: 4, ARK: 5, AST: 6, BA: 7, BEL: 8, BRY: 9, BU: 10, CE: 11, CHE: 12, CHU: 13, CR: 14, CU: 15, DA: 16,
-    GA: 17, IN: 18, IRK: 19, IVA: 20, KAM: 21, KB: 22, KC: 23, KDA: 24, KEM: 25, KGD: 26, KGN: 27, KHA: 28, KHM: 29, KIR: 30,
-    KK: 31, KL: 32, KLU: 33, KO: 34, KOS: 35, KR: 36, KRS: 37, KYA: 38, LEN: 39, LIP: 40, MAG: 41, ME: 42, MO: 43, MOS: 44,
-    MOW: 45, MUR: 46, NEN: 47, NGR: 48, NIZ: 49, NVS: 50, OMS: 51, ORE: 52, ORL: 53, PER: 54, PNZ: 55, PRI: 56, PSK: 57,
-    ROS: 58, RYA: 59, SA: 60, SAK: 61, SAM: 62, SAR: 63, SE: 64, SMO: 65, SPE: 66, STA: 67, SVE: 68, TAM: 69, TOM: 70, TT: 71,
-    TUL: 72, TVE: 73, TY: 74, TYU: 75, UD: 76, ULY: 77, VGG: 78, VLA: 79, VLG: 80, VOR: 81, YAN: 82, YAR: 83, YEV: 84, ZAB: 85
-  }
-
-  VIRTUAL_REGIONS = ['ALL'].freeze
-  FETCHABLE_REGIONS = (regions.keys - VIRTUAL_REGIONS).freeze
-  STATISTICS_ATTRIBUTES = %i[sick healed died].freeze
-
-  validates :region, inclusion: { in: FETCHABLE_REGIONS }
-
-  class << self
-    def day_stats(region: 'ALL', date: nil, return_i18n: false)
-      date ||= CovidStat.order(date: :desc).first.date
-
-      select_params = STATISTICS_ATTRIBUTES.map { |a| "SUM(#{a}) as #{a}" }.join(',')
-      current_stats, previous_stats = [date, date - 1.day].map do |d|
-        query = { date: d }
-        query[:region] = region if region != 'ALL'
-        CovidStat.where(query).select(select_params)
-      end.flatten
-
-      results = { date: date, region: region, current: current_stats }
-      results[:delta] = STATISTICS_ATTRIBUTES.map do |a|
-        previous_param = previous_stats.send(a)
-        current_param = current_stats.send(a)
-
-        result = if current_param.nil? || previous_param.nil?
-                   '?'
-                 else
-                   current_param - previous_param
-                 end
-        [a, result]
-      end.to_h
-      if return_i18n
-        printable_results = STATISTICS_ATTRIBUTES.map do |a|
-          current = results[:current].send(a) || '?'
-          delta = results[:delta][a]
-          delta = if delta.present?
-                    delta.to_i.positive? ? "+#{delta}" : delta.to_s
-                  else
-                    '?'
-                  end
-          [a, "#{current} (#{delta})"]
-        end.to_h
-
-        I18n.t('covid_stat.stats_html', region: I18n.t("covid_stat.regions.#{region}"),
-                                        date: date,
-                                        sick: printable_results[:sick],
-                                        healed: printable_results[:healed],
-                                        died: printable_results[:died])
-      else
-        results
-      end
-    end
-
-    def needs_update?
-      sample_region = FETCHABLE_REGIONS.sample
-      remote_max_date = StopCovidService.get_data(sample_region).map { |r| r[:date] }.max
-      local_max_date = CovidStat.where(region: sample_region).maximum(:date)
-      return true if local_max_date.blank?
-
-      remote_max_date > local_max_date
-    end
-
-    def update_all
-      FETCHABLE_REGIONS.each { |r| CovidRegionUpdaterWorker.perform_async(r) }
-    end
-
-    def update(region_id)
-      StopCovidService.get_data(region_id).map do |r|
-        record_key = { date: r[:date], region: region_id }
-        stat_record = CovidStat.find_or_initialize_by(record_key)
-        stat_record.update(r.except(:date, :region))
-        stat_record.save!
-        stat_record
-      end
-    end
-  end
-end
diff --git a/app/models/data_bank.rb b/app/models/data_bank.rb
index 337db59..0fabd27 100644
--- a/app/models/data_bank.rb
+++ b/app/models/data_bank.rb
@@ -5,10 +5,10 @@ class DataBank < ApplicationRecord
 
   class << self
     def update(filename:, id: nil, name: nil)
-      databank = Databank.find_by(id: id) || Databank.create(name: name)
+      databank = Databank.find_by(id:) || Databank.create(name:)
       databank.pairs.destroy
       words = File.read(filename, 'r').split(' ')
-      Pair.learn(chat_id: nil, data_bank_id: databank.id, words: words)
+      Pair.learn(chat_id: nil, data_bank_id: databank.id, words:)
     end
   end
 end
diff --git a/app/models/pair.rb b/app/models/pair.rb
index 2ebf3d7..ea5c11a 100644
--- a/app/models/pair.rb
+++ b/app/models/pair.rb
@@ -18,10 +18,10 @@ def check_chat_and_bank
   end
 
   class << self
-    def learn(chat: nil, data_bank: nil, words:)
+    def learn(words:, chat: nil, data_bank: nil)
       raise 'Chat OR Databank must be specified' if chat.nil? == data_bank.nil?
-      Word.learn(words)
 
+      Word.learn(words)
       words_array = [nil]
       words.each do |word|
         words_array << word
@@ -37,8 +37,8 @@ def learn(chat: nil, data_bank: nil, words:)
           next
         end
         words_ids.shift
-        pair_params = { chat: chat,
-                        data_bank: data_bank,
+        pair_params = { chat:,
+                        data_bank:,
                         first_id: trigram.first,
                         second_id: trigram.second }
         pair = Pair.includes(:replies).find_or_create_by!(pair_params)
@@ -52,13 +52,13 @@ def build_sentence(chat: self.chat, words: nil, words_ids: nil)
       words_ids = Word.to_ids(words) if words.present?
       sentence = []
       safety_counter = 50
-      pair_params = { chat: chat, first_id: nil, second_id: words_ids }
+      pair_params = { chat:, first_id: nil, second_id: words_ids }
 
       while (pair = fetch_pair(pair_params)) && (sentence.size < safety_counter) do
         replies = pair.replies.order(count: :desc)
         replies_pool = 3 + replies.size / 2
         reply = replies.limit(replies_pool).sample
-        pair_params = { chat: chat, first_id: pair.second_id, second_id: reply&.word_id }
+        pair_params = { chat:, first_id: pair.second_id, second_id: reply&.word_id }
         sentence << pair.second_id if sentence.empty?
         reply&.word_id.nil? ? break : sentence << reply.word_id
       end
diff --git a/app/models/participation.rb b/app/models/participation.rb
index ab8329b..4b9132b 100644
--- a/app/models/participation.rb
+++ b/app/models/participation.rb
@@ -6,15 +6,6 @@ class Participation < ApplicationRecord
 
   scope :scored, -> { where.not(score: 0) }
 
-  def ban
-    Rails.application.secrets[:telegram][:owners].each do |owner_id|
-      respose = "CASBAN #{user.to_link} at #{chat.title}"
-      # SendPayloadWorker.perform_async(:ban_chat_member, revoke_messages: true, chat_id: chat.telegram_id, user_id: user.id)
-      SendPayloadWorker.perform_async('send_message', 'chat_id' => owner_id, 'parse_mode' => 'html', 'text' => respose)
-    end
-    update!(left: true)
-  end
-
   def learn(message)
     self.experience += rand(3) if active_at.nil? || 5.minutes.ago > active_at
     self.active_at = Time.current
@@ -32,22 +23,12 @@ class << self
     #   (level * (level - 1) / 2.to_f) * 100
     # end
 
-    def ban_all
-      ban_list = Participation.joins(:chat, :user)
-                              .where(participations: { left: false })
-                              .where.not(chats: { casbanhammer_at: nil })
-                              .where.not(users: { casbanned_at: nil })
-
-      ban_list.each(&:ban)
-      ban_list
-    end
-
     def learn(message)
       chat = Chat.find_by(telegram_id: message&.chat&.id)
       user = User.find_by(id: message&.from&.id)
       return if chat.nil? || user.nil?
 
-      Participation.find_or_create_by(chat: chat, user: user).learn(message)
+      Participation.find_or_create_by(chat:, user:).learn(message)
     end
   end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index 4696979..c3e9d4b 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -4,8 +4,6 @@ class User < ApplicationRecord
   has_many :participations, dependent: :destroy
   has_many :chats, through: :participations
 
-  scope :casbanned, -> { where.not(casbanned_at: nil) }
-
   def to_s
     username || first_name || last_name
   end
@@ -14,31 +12,10 @@ def to_link
     "<a href='tg://user?id=#{id}'>#{self}</a>"
   end
 
-  def casban!
-    update!(casbanned_at: Time.current)
-  end
-
-  def casbanned?
-    casbanned_at.present?
-  end
-
   def self.learn(tg_user)
     user = User.find_by(id: tg_user.id) || User.new(id: tg_user.id)
     user.update(tg_user.to_h.slice(:username, :first_name, :last_name, :is_bot))
     user.save!
     user
   end
-
-  def update_casban
-    return if casbanchecked_at.present? && casbanchecked_at < 1.week.since
-
-    banned = CasService.banned?(id)
-    return if banned.nil?
-
-    self.casbanchecked_at = Time.current
-    self.casbanned_at = banned ? Time.current : nil
-
-    save!
-    self
-  end
 end
diff --git a/app/models/word.rb b/app/models/word.rb
index 457b1a5..ac6290e 100644
--- a/app/models/word.rb
+++ b/app/models/word.rb
@@ -19,7 +19,7 @@ def learn(words)
       new_words = words - Word.where(word: words).pluck(:word)
       return nil if new_words.blank?
 
-      words_array = new_words.uniq.map { |word| { word: word} }
+      words_array = new_words.uniq.map { |word| { word: } }
       Word.insert_all(words_array)
     end
   end
diff --git a/app/processors/concerns/processor.rb b/app/processors/concerns/processor.rb
index 3aa96d4..fc17592 100644
--- a/app/processors/concerns/processor.rb
+++ b/app/processors/concerns/processor.rb
@@ -69,6 +69,6 @@ def user
   end
 
   def participation
-    @participation ||= Participation.find_by!(chat: chat, user: user)
+    @participation ||= Participation.find_by!(chat:, user:)
   end
 end
diff --git a/app/processors/message_processor.rb b/app/processors/message_processor.rb
index 0778cf7..b702165 100644
--- a/app/processors/message_processor.rb
+++ b/app/processors/message_processor.rb
@@ -1,11 +1,9 @@
 # frozen_string_literal: true
 
 module MessageProcessor
-  AVAILABLE_PROCESSORS = %w[CasBanner
-                            Me
+  AVAILABLE_PROCESSORS = %w[Me
                             Say
                             BinaryDice
-                            CovidStats
                             CoolStory
                             Databank
                             Eightball
diff --git a/app/processors/message_processor/cas_banner.rb b/app/processors/message_processor/cas_banner.rb
deleted file mode 100644
index af7ad1e..0000000
--- a/app/processors/message_processor/cas_banner.rb
+++ /dev/null
@@ -1,54 +0,0 @@
-# frozen_string_literal: true
-
-module MessageProcessor
-  class CasBanner
-    include Processor
-    include CommandParameters
-
-    def responds?
-      super && command == 'cas'
-    end
-
-    def process!
-      response = case first_parameter
-                 when 'enable', 'on'
-                   enable
-                 when 'disable', 'off'
-                   disable
-                 else
-                   show
-                 end
-
-      { send_message: { chat_id: chat.telegram_id,
-                        reply_to_message_id: message.message_id,
-                        parse_mode: :markdown,
-                        text: response } }
-    end
-
-    private
-
-    def enable
-      chat.update!(casbanhammer_at: Time.current)
-      ok
-    end
-
-    def disable
-      chat.update!(casbanhammer_at: nil)
-      ok
-    end
-
-    def show
-      I18n.t('.cas_banner', active: I18n.t(chat.casbanhammer?.to_s),
-                            count: chat.participations.joins(:user).where.not(users: { casbanned_at: nil }).size,
-                            overall: User.casbanned.size)
-    end
-
-    def background_task
-      user.update_casban
-
-      new_chat_members.map { |m| User.learn(m).update_casban } if new_chat_members.present?
-
-      Participation.ban_all
-    end
-  end
-end
diff --git a/app/processors/message_processor/covid_stats.rb b/app/processors/message_processor/covid_stats.rb
deleted file mode 100644
index 2c22500..0000000
--- a/app/processors/message_processor/covid_stats.rb
+++ /dev/null
@@ -1,60 +0,0 @@
-# frozen_string_literal: true
-
-module MessageProcessor
-  class CovidStats
-    include Processor
-    include CommandParameters
-
-    def responds?
-      super && command == 'covid_stats'
-    end
-
-    def process!
-      response = case first_parameter
-                 when 'enable', 'on'
-                   enable
-                 when 'disable', 'off'
-                   disable
-                 when 'available'
-                   available_regions
-                 else
-                   show
-                 end
-
-      { send_message: { chat_id: chat.telegram_id,
-                        reply_to_message_id: message.message_id,
-                        parse_mode: :html,
-                        text: response } }
-    end
-
-    private
-
-    def available_regions
-      list = I18n.t('covid_stat.regions').map do |key, name|
-        I18n.t('covid_stat.region_item_html', key: key.to_s.rjust(4), name: name)
-      end
-      I18n.t('covid_stat.region_list_html', items: list.join("\n"))
-    end
-
-    def show
-      region = (first_parameter || chat.covid_region || 'ALL').to_s.upcase
-      return nok unless region.in? CovidStat.regions.keys
-
-      CovidStat.day_stats(region: region, return_i18n: true)
-    end
-
-    def enable
-      param = second_parameter.to_s.upcase
-      param = 'ALL' if param.blank?
-      return nok unless param.in? CovidStat.regions.keys
-
-      chat.update!(covid_region: param)
-      ok
-    end
-
-    def disable
-      chat.update!(covid_region: nil)
-      ok
-    end
-  end
-end
diff --git a/app/processors/message_processor/databank.rb b/app/processors/message_processor/databank.rb
index 5958bfe..97a86d1 100644
--- a/app/processors/message_processor/databank.rb
+++ b/app/processors/message_processor/databank.rb
@@ -52,9 +52,9 @@ def disable
 
     def show
       databanks = DataBank.pluck(:id, :name).to_h
-      list = databanks.map { |id, name| I18n.t('.databank.list_line_html', id: id, name: name) }.join("\n")
+      list = databanks.map { |id, name| I18n.t('.databank.list_line_html', id:, name:) }.join("\n")
       active = chat.data_bank_ids.present? ? chat.data_bank_ids.to_sentence : I18n.t('false')
-      I18n.t('.databank.list_html', list: list, active: active)
+      I18n.t('.databank.list_html', list:, active:)
     end
   end
 end
diff --git a/app/processors/message_processor/eightball.rb b/app/processors/message_processor/eightball.rb
index 70fab8f..69fb28c 100644
--- a/app/processors/message_processor/eightball.rb
+++ b/app/processors/message_processor/eightball.rb
@@ -32,7 +32,7 @@ def generate_prediction
       return I18n.t('eightball.empty').sample if command_parameters.blank?
 
       answers = I18n.t('.eightball.replies')
-      digest = Digest::SHA1.hexdigest(command_parameters).to_i(16) - Date.today.to_time.to_i.div(100) - user.id
+      digest = Digest::SHA1.hexdigest(command_parameters).to_i(16) - Time.zone.today.to_time.to_i.div(100) - user.id
       answer_id = digest.divmod(answers.count)[1]
       answers[answer_id]
     end
diff --git a/app/processors/message_processor/status.rb b/app/processors/message_processor/status.rb
index 65edf34..2efc510 100644
--- a/app/processors/message_processor/status.rb
+++ b/app/processors/message_processor/status.rb
@@ -23,7 +23,6 @@ def response
                         gab: chat.random,
                         pairs: chat.pairs.size,
                         databanks: I18n.t(chat.data_bank_ids.present?.to_s),
-                        cas_banner: I18n.t(chat.casbanhammer?.to_s),
                         winner: chat.winner || I18n.t('.winner.disabled'))
     end
   end
diff --git a/app/processors/message_processor/winner.rb b/app/processors/message_processor/winner.rb
index 6e6bfb4..48be2c3 100644
--- a/app/processors/message_processor/winner.rb
+++ b/app/processors/message_processor/winner.rb
@@ -39,7 +39,7 @@ def current_stats
                   I18n.t('winner.top_line_html', position: i + 1, user: p.user.to_s, score: p.score) if p.user.present?
                 end.compact.join("\n")
 
-      I18n.t('winner.current_html', top: top)
+      I18n.t('winner.current_html', top:)
     end
 
     def previous_winner
@@ -56,7 +56,7 @@ def previous_winner
                   .map { |(user, wins), idx| I18n.t('winner.top_line_html', position: idx + 1, user: user.to_s, score: wins) }
                   .join("\n")
 
-        I18n.t('winner.winner_html', top: top, name: chat.winner, user: winner)
+        I18n.t('winner.winner_html', top:, name: chat.winner, user: winner)
       else
         I18n.t('winner.no_one')
       end
diff --git a/app/services/cas_service.rb b/app/services/cas_service.rb
deleted file mode 100644
index a04ddcb..0000000
--- a/app/services/cas_service.rb
+++ /dev/null
@@ -1,20 +0,0 @@
-# frozen_string_literal: true
-
-module CasService
-  class << self
-    def banned?(telegram_id)
-      body = Faraday.get(url(telegram_id)).body
-      value = JSON.parse(body)
-      ActiveModel::Type::Boolean.new.cast(value['ok'])
-    rescue StandardError
-      SentryService.capture_exception(exception)
-      nil
-    end
-
-    private
-
-    def url(telegram_id)
-      "#{Rails.configuration.secrets[:cas_url]}/check?user_id=#{telegram_id}"
-    end
-  end
-end
diff --git a/app/services/stop_covid_service.rb b/app/services/stop_covid_service.rb
deleted file mode 100644
index 00acff0..0000000
--- a/app/services/stop_covid_service.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-# frozen_string_literal: true
-
-module StopCovidService
-  class << self
-    ALLOWED_PARAMS = %i[date sick healed died first second].freeze
-
-    def get_data(region_id)
-      body = Faraday.get(url(region_id)).body
-      json = JSON.parse(body).map(&:symbolize_keys)
-      json.map do |record|
-        new_date = Date.parse(record[:date])
-        record.slice(*ALLOWED_PARAMS).except(:date).merge(date: new_date)
-      end
-    end
-
-    private
-
-    def url(region_id)
-      "#{Rails.configuration.secrets[:stop_covid_url]}/covid_data.json?do=region_stats&code=RU-#{region_id.upcase}"
-    end
-  end
-end
diff --git a/app/workers/covid_region_updater_worker.rb b/app/workers/covid_region_updater_worker.rb
deleted file mode 100644
index a74664c..0000000
--- a/app/workers/covid_region_updater_worker.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-class CovidRegionUpdaterWorker
-  include Sidekiq::Worker
-
-  sidekiq_options queue: 'updating'
-  sidekiq_options retry: false
-
-  def perform(region_id)
-    CovidStat.update(region_id)
-  end
-end
diff --git a/app/workers/covid_sender_worker.rb b/app/workers/covid_sender_worker.rb
deleted file mode 100644
index 51b86ff..0000000
--- a/app/workers/covid_sender_worker.rb
+++ /dev/null
@@ -1,21 +0,0 @@
-# frozen_string_literal: true
-
-class CovidSenderWorker
-  include Sidekiq::Worker
-
-  sidekiq_options retry: false
-
-  def perform
-    dates = CovidStat.group(:region).maximum(:date)
-    dates['ALL'] = dates.values.max
-    Chat.active.where.not(covid_region: nil).each do |c|
-      next if c.covid_last_notification.present? && c.covid_last_notification >= dates[c.covid_region]
-
-      c.update!(covid_last_notification: dates[c.covid_region])
-      parameters = { text: CovidStat.day_stats(region: c.covid_region, return_i18n: true),
-                     parse_mode: :html,
-                     chat_id: c.telegram_id }
-      SendPayloadWorker.perform_async(:send_message, parameters)
-    end
-  end
-end
diff --git a/app/workers/covid_updater_worker.rb b/app/workers/covid_updater_worker.rb
deleted file mode 100644
index 5e14100..0000000
--- a/app/workers/covid_updater_worker.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-# frozen_string_literal: true
-
-class CovidUpdaterWorker
-  include Sidekiq::Worker
-
-  sidekiq_options queue: 'updating'
-  sidekiq_options retry: false
-
-  def perform
-    CovidStat.update_all if CovidStat.needs_update?
-  end
-end
diff --git a/app/workers/pair_update_worker.rb b/app/workers/pair_update_worker.rb
index fbba695..64c3327 100644
--- a/app/workers/pair_update_worker.rb
+++ b/app/workers/pair_update_worker.rb
@@ -7,6 +7,6 @@ class PairUpdateWorker
   def perform(chat_id, text)
     chat = Chat.find(chat_id)
 
-    Pair.learn(chat: chat, words: text.split)
+    Pair.learn(chat:, words: text.split)
   end
 end
diff --git a/app/workers/winner_gamble_worker.rb b/app/workers/winner_gamble_worker.rb
index 50b7a8d..cd23fe8 100644
--- a/app/workers/winner_gamble_worker.rb
+++ b/app/workers/winner_gamble_worker.rb
@@ -18,7 +18,7 @@ def perform(chat_id)
               .map { |(user, wins), idx| I18n.t('winner.top_line_html', position: idx + 1, user: user.to_s, score: wins) }
               .join("\n")
 
-    parameters = { text: I18n.t('winner.winner_html', top: top, name: chat.winner, user: winner.to_link),
+    parameters = { text: I18n.t('winner.winner_html', top:, name: chat.winner, user: winner.to_link),
                    parse_mode: :html,
                    disable_notification: true,
                    chat_id: chat.telegram_id }
diff --git a/config/application.rb b/config/application.rb
index 92468eb..056cf9a 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -34,7 +34,6 @@ class Application < Rails::Application
     # config.time_zone = "Central Time (US & Canada)"
     # config.eager_load_paths << Rails.root.join("extras")
 
-
     # Only loads a smaller set of middleware suitable for API only apps.
     # Middleware like session, flash, cookies can be added back manually.
     # Skip views, helpers and assets when generating a new resource.
diff --git a/config/boot.rb b/config/boot.rb
index 2ecfc50..ad622f6 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 require "bundler/setup" # Set up gems listed in the Gemfile.
diff --git a/config/environment.rb b/config/environment.rb
index cac5315..7df99e8 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Load the Rails application.
 require_relative "application"
 
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 5bb4432..0a0c1c1 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
@@ -45,7 +47,6 @@
   # Highlight code that triggered database queries in logs.
   config.active_record.verbose_query_logs = true
 
-
   # Raises error for missing translations.
   # config.i18n.raise_on_missing_translations = true
 
diff --git a/config/environments/production.rb b/config/environments/production.rb
index 98e3fb2..8de44ea 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
@@ -13,7 +15,7 @@
   config.eager_load = true
 
   # Full error reports are disabled and caching is turned on.
-  config.consider_all_requests_local       = false
+  config.consider_all_requests_local = false
 
   # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
   # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
@@ -38,7 +40,7 @@
   config.log_level = :info
 
   # Prepend all log lines with the following tags.
-  config.log_tags = [ :request_id ]
+  config.log_tags = [:request_id]
 
   # Use a different cache store in production.
   # config.cache_store = :mem_cache_store
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 0eb0fe6..d96f2ab 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_support/core_ext/integer/time"
 
 # The test environment is used exclusively to run your application's
diff --git a/config/initializers/cors.rb b/config/initializers/cors.rb
index e5a82f1..62875c1 100644
--- a/config/initializers/cors.rb
+++ b/config/initializers/cors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Avoid CORS issues when API is called from the frontend app.
diff --git a/config/initializers/filter_parameter_logging.rb b/config/initializers/filter_parameter_logging.rb
index 4b34a03..e214a4c 100644
--- a/config/initializers/filter_parameter_logging.rb
+++ b/config/initializers/filter_parameter_logging.rb
@@ -1,6 +1,6 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Configure sensitive parameters which will be filtered from the log file.
-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/inflections.rb b/config/initializers/inflections.rb
index 3860f65..9e049dc 100644
--- a/config/initializers/inflections.rb
+++ b/config/initializers/inflections.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Be sure to restart your server when you modify this file.
 
 # Add new inflection rules using the following format. Inflections
diff --git a/config/initializers/new_framework_defaults_6_1.rb b/config/initializers/new_framework_defaults_6_1.rb
deleted file mode 100644
index a128fd3..0000000
--- a/config/initializers/new_framework_defaults_6_1.rb
+++ /dev/null
@@ -1,64 +0,0 @@
-# frozen_string_literal: true
-# Be sure to restart your server when you modify this file.
-#
-# This file contains migration options to ease your Rails 6.1 upgrade.
-#
-# Once upgraded flip defaults one by one to migrate to the new default.
-#
-# Read the Guide for Upgrading Ruby on Rails for more info on each option.
-
-# Support for inversing belongs_to -> has_many Active Record associations.
-# Rails.application.config.active_record.has_many_inversing = true
-
-# Track Active Storage variants in the database.
-# Rails.application.config.active_storage.track_variants = true
-
-# Apply random variation to the delay when retrying failed jobs.
-# Rails.application.config.active_job.retry_jitter = 0.15
-
-# Stop executing `after_enqueue`/`after_perform` callbacks if
-# `before_enqueue`/`before_perform` respectively halts with `throw :abort`.
-# Rails.application.config.active_job.skip_after_callbacks_if_terminated = true
-
-# Specify cookies SameSite protection level: either :none, :lax, or :strict.
-#
-# This change is not backwards compatible with earlier Rails versions.
-# It's best enabled when your entire app is migrated and stable on 6.1.
-# Rails.application.config.action_dispatch.cookies_same_site_protection = :lax
-
-# Generate CSRF tokens that are encoded in URL-safe Base64.
-#
-# This change is not backwards compatible with earlier Rails versions.
-# It's best enabled when your entire app is migrated and stable on 6.1.
-# Rails.application.config.action_controller.urlsafe_csrf_tokens = true
-
-# Specify whether `ActiveSupport::TimeZone.utc_to_local` returns a time with an
-# UTC offset or a UTC time.
-# ActiveSupport.utc_to_local_returns_utc_offset_times = true
-
-# Change the default HTTP status code to `308` when redirecting non-GET/HEAD
-# requests to HTTPS in `ActionDispatch::SSL` middleware.
-# Rails.application.config.action_dispatch.ssl_default_redirect_status = 308
-
-# Use new connection handling API. For most applications this won't have any
-# effect. For applications using multiple databases, this new API provides
-# support for granular connection swapping.
-# Rails.application.config.active_record.legacy_connection_handling = false
-
-# Make `form_with` generate non-remote forms by default.
-# Rails.application.config.action_view.form_with_generates_remote_forms = false
-
-# Set the default queue name for the analysis job to the queue adapter default.
-# Rails.application.config.active_storage.queues.analysis = nil
-
-# Set the default queue name for the purge job to the queue adapter default.
-# Rails.application.config.active_storage.queues.purge = nil
-
-# Set the default queue name for the incineration job to the queue adapter default.
-# Rails.application.config.action_mailbox.queues.incineration = nil
-
-# Set the default queue name for the routing job to the queue adapter default.
-# Rails.application.config.action_mailbox.queues.routing = nil
-
-# Set the default queue name for the mail deliver job to the queue adapter default.
-# Rails.application.config.action_mailer.deliver_later_queue_name = nil
diff --git a/config/initializers/new_framework_defaults_7_0.rb b/config/initializers/new_framework_defaults_7_0.rb
deleted file mode 100644
index a579326..0000000
--- a/config/initializers/new_framework_defaults_7_0.rb
+++ /dev/null
@@ -1,117 +0,0 @@
-# Be sure to restart your server when you modify this file.
-#
-# This file eases your Rails 7.0 framework defaults upgrade.
-#
-# Uncomment each configuration one by one to switch to the new default.
-# Once your application is ready to run with all new defaults, you can remove
-# this file and set the `config.load_defaults` to `7.0`.
-#
-# Read the Guide for Upgrading Ruby on Rails for more info on each option.
-# https://guides.rubyonrails.org/upgrading_ruby_on_rails.html
-
-# `button_to` view helper will render `<button>` element, regardless of whether
-# or not the content is passed as the first argument or as a block.
-# Rails.application.config.action_view.button_to_generates_button_tag = true
-
-# `stylesheet_link_tag` view helper will not render the media attribute by default.
-# Rails.application.config.action_view.apply_stylesheet_media_default = false
-
-# Change the digest class for the key generators to `OpenSSL::Digest::SHA256`.
-# Changing this default means invalidate all encrypted messages generated by
-# your application and, all the encrypted cookies. Only change this after you
-# rotated all the messages using the key rotator.
-#
-# See upgrading guide for more information on how to build a rotator.
-# https://guides.rubyonrails.org/v7.0/upgrading_ruby_on_rails.html
-# Rails.application.config.active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA256
-
-# Change the digest class for ActiveSupport::Digest.
-# Changing this default means that for example Etags change and
-# various cache keys leading to cache invalidation.
-# Rails.application.config.active_support.hash_digest_class = OpenSSL::Digest::SHA256
-
-# Don't override ActiveSupport::TimeWithZone.name and use the default Ruby
-# implementation.
-# Rails.application.config.active_support.remove_deprecated_time_with_zone_name = true
-
-# Change the format of the cache entry.
-# Changing this default means that all new cache entries added to the cache
-# will have a different format that is not supported by Rails 6.1 applications.
-# Only change this value after your application is fully deployed to Rails 7.0
-# and you have no plans to rollback.
-# Rails.application.config.active_support.cache_format_version = 7.0
-
-# Calls `Rails.application.executor.wrap` around test cases.
-# This makes test cases behave closer to an actual request or job.
-# Several features that are normally disabled in test, such as Active Record query cache
-# and asynchronous queries will then be enabled.
-# Rails.application.config.active_support.executor_around_test_case = true
-
-# Define the isolation level of most of Rails internal state.
-# If you use a fiber based server or job processor, you should set it to `:fiber`.
-# Otherwise the default of `:thread` if preferable.
-# Rails.application.config.active_support.isolation_level = :thread
-
-# Set both the `:open_timeout` and `:read_timeout` values for `:smtp` delivery method.
-# Rails.application.config.action_mailer.smtp_timeout = 5
-
-# The ActiveStorage video previewer will now use scene change detection to generate
-# better preview images (rather than the previous default of using the first frame
-# of the video).
-# Rails.application.config.active_storage.video_preview_arguments =
-#   "-vf 'select=eq(n\\,0)+eq(key\\,1)+gt(scene\\,0.015),loop=loop=-1:size=2,trim=start_frame=1' -frames:v 1 -f image2"
-
-# Automatically infer `inverse_of` for associations with a scope.
-# Rails.application.config.active_record.automatic_scope_inversing = true
-
-# Raise when running tests if fixtures contained foreign key violations
-# Rails.application.config.active_record.verify_foreign_keys_for_fixtures = true
-
-# Disable partial inserts.
-# This default means that all columns will be referenced in INSERT queries
-# regardless of whether they have a default or not.
-# Rails.application.config.active_record.partial_inserts = false
-#
-# Protect from open redirect attacks in `redirect_back_or_to` and `redirect_to`.
-# Rails.application.config.action_controller.raise_on_open_redirects = true
-
-# Change the variant processor for Active Storage.
-# Changing this default means updating all places in your code that
-# generate variants to use image processing macros and ruby-vips
-# operations. See the upgrading guide for detail on the changes required.
-# The `:mini_magick` option is not deprecated; it's fine to keep using it.
-# Rails.application.config.active_storage.variant_processor = :vips
-
-# If you're upgrading and haven't set `cookies_serializer` previously, your cookie serializer
-# was `:marshal`. Convert all cookies to JSON, using the `:hybrid` formatter.
-#
-# If you're confident all your cookies are JSON formatted, you can switch to the `:json` formatter.
-#
-# Continue to use `:marshal` for backward-compatibility with old cookies.
-#
-# If you have configured the serializer elsewhere, you can remove this.
-#
-# See https://guides.rubyonrails.org/action_controller_overview.html#cookies for more information.
-# Rails.application.config.action_dispatch.cookies_serializer = :hybrid
-
-# Enable parameter wrapping for JSON.
-# Previously this was set in an initializer. It's fine to keep using that initializer if you've customized it.
-# To disable parameter wrapping entirely, set this config to `false`.
-# Rails.application.config.action_controller.wrap_parameters_by_default = true
-
-# Specifies whether generated namespaced UUIDs follow the RFC 4122 standard for namespace IDs provided as a
-# `String` to `Digest::UUID.uuid_v3` or `Digest::UUID.uuid_v5` method calls.
-#
-# See https://guides.rubyonrails.org/configuring.html#config-active-support-use-rfc4122-namespaced-uuids for
-# more information.
-# Rails.application.config.active_support.use_rfc4122_namespaced_uuids = true
-
-# Change the default headers to disable browsers' flawed legacy XSS protection.
-# Rails.application.config.action_dispatch.default_headers = {
-#   "X-Frame-Options" => "SAMEORIGIN",
-#   "X-XSS-Protection" => "0",
-#   "X-Content-Type-Options" => "nosniff",
-#   "X-Download-Options" => "noopen",
-#   "X-Permitted-Cross-Domain-Policies" => "none",
-#   "Referrer-Policy" => "strict-origin-when-cross-origin"
-# }
diff --git a/config/locales/ru_RU/cas_banner.yml b/config/locales/ru_RU/cas_banner.yml
deleted file mode 100644
index 9165a96..0000000
--- a/config/locales/ru_RU/cas_banner.yml
+++ /dev/null
@@ -1,7 +0,0 @@
-ru_RU:
-  cas_banner: |
-    *Активен:* %{active}
-    *Всего:* %{overall}
-    *В этом чате:* %{count}
-
-    Powered by [CAS](https://cas.chat/)
diff --git a/config/locales/ru_RU/covid_stat.yml b/config/locales/ru_RU/covid_stat.yml
deleted file mode 100644
index 1306f44..0000000
--- a/config/locales/ru_RU/covid_stat.yml
+++ /dev/null
@@ -1,97 +0,0 @@
-ru_RU:
-  covid_stat:
-    region_list_html: |
-      <code><u><b>Ключ — Регион</b></u>
-      %{items}</code>
-    region_item_html: "<b>%{key}</b> — %{name}"
-    stats_html: |
-      <b>%{date}: %{region}</b>
-      <b>Выявлено:</b> %{sick}
-      <b>Выздоровело:</b> %{healed}
-      <b>Умерло:</b> %{died}
-    regions:
-      ALL: Россия
-      ALT: Алтайский край
-      AMU: Амурская область
-      ARK: Архангельская область
-      AST: Астраханская область
-      BEL: Белгородская область
-      BRY: Брянская область
-      VLA: Владимирская область
-      VGG: Волгоградская область
-      VLG: Вологодская область
-      VOR: Воронежская область
-      YEV: Еврейская автономная область
-      ZAB: Забайкальский край
-      IVA: Ивановская область
-      IRK: Иркутская область
-      KB: Кабардино-Балкарская Республика
-      KGD: Калининградская область
-      KLU: Калужская область
-      KAM: Камчатский край
-      KC: Карачаево-Черкесская Республика
-      KEM: Кемеровская область
-      KIR: Кировская область
-      KOS: Костромская область
-      AD: Краснодарский край
-      KDA: Краснодарский край
-      KYA: Красноярский край
-      KGN: Курганская область
-      KRS: Курская область
-      LEN: Ленинградская область
-      LIP: Липецкая область
-      MAG: Магаданская область
-      MOW: Москва
-      MOS: Московская область
-      MUR: Мурманская область
-      NEN: Ненецкий автономный округ
-      NIZ: Нижегородская область
-      NGR: Новгородская область
-      NVS: Новосибирская область
-      OMS: Омская область
-      ORE: Оренбургская область
-      ORL: Орловская область
-      PNZ: Пензенская область
-      PER: Пермский край
-      PRI: Приморский край
-      PSK: Псковская область
-      GA: Республика Алтай
-      BA: Республика Башкортостан
-      BU: Республика Бурятия
-      DA: Республика Дагестан
-      IN: Республика Ингушетия
-      KL: Республика Калмыкия
-      KR: Республика Карелия
-      KO: Республика Коми
-      ME: Республика Марий Эл
-      MO: Республика Мордовия
-      SA: Республика Саха (Якутия)
-      SE: Республика Северная Осетия — Алания
-      TT: Республика Татарстан
-      TY: Республика Тыва
-      KK: Республика Хакасия
-      CU: Республика Чувашия
-      ROS: Ростовская область
-      RYA: Рязанская область
-      SAM: Самарская область
-      SPE: Санкт-Петербург
-      SAR: Саратовская область
-      SAK: Сахалинская область
-      SVE: Свердловская область
-      CR: Севастополь
-      SMO: Смоленская область
-      STA: Ставропольский край
-      TAM: Тамбовская область
-      TVE: Тверская область
-      TOM: Томская область
-      TUL: Тульская область
-      TYU: Тюменская область
-      UD: Удмуртская Республика
-      ULY: Ульяновская область
-      KHA: Хабаровский край
-      KHM: Ханты-Мансийский АО
-      CHE: Челябинская область
-      CE: Чеченская Республика
-      CHU: Чукотский автономный округ
-      YAN: Ямало-Ненецкий автономный округ
-      YAR: Ярославская область
diff --git a/config/locales/ru_RU/status.yml b/config/locales/ru_RU/status.yml
index 0009d4c..04664a8 100644
--- a/config/locales/ru_RU/status.yml
+++ b/config/locales/ru_RU/status.yml
@@ -4,7 +4,6 @@ ru_RU:
     *Неудержимость:* %{gab}%
     *Пар в БД:* %{pairs}
     *Банки данных:* %{databanks}
-    *СAS-банхаммер:* %{cas_banner}
     *Победитель:* %{winner}
 
     *Версия:* %{version}
diff --git a/config/secrets.yml b/config/secrets.yml
index 4880bad..bd4ad6f 100644
--- a/config/secrets.yml
+++ b/config/secrets.yml
@@ -19,8 +19,6 @@ default: &default
     webhook: <%= ENV['WEBHOOK_URL'] %>
     owners: <%= ENV['BOT_OWNERS']&.split(',')&.map(&:to_i) || [0] %>
 
-  cas_url: <%= ENV.fetch('CAS_URL') { 'https://api.cas.chat' } %>
-  stop_covid_url: <%= ENV.fetch('STOPCOVID_URL') { 'https://xn--80aesfpebagmfblc0a.xn--p1ai' } %>
   context_size: <%= ENV.fetch('CONTEXT_SIZE') { 50 } %>
   allow_all: <%= ENV['ALLOW_TO_ALL'].to_s.downcase == 'true' %>
   sentry_dsn: <%= ENV['SENTRY_DSN'] %>
diff --git a/config/sidekiq_schedules/covid_stats.yml.deprecated b/config/sidekiq_schedules/covid_stats.yml.deprecated
deleted file mode 100644
index 25a6318..0000000
--- a/config/sidekiq_schedules/covid_stats.yml.deprecated
+++ /dev/null
@@ -1,7 +0,0 @@
-check_new_data:
-  cron: "*/23 * * * *"
-  class: "CovidUpdaterWorker"
-
-send_new_data:
-  cron: "*/5 * * * *"
-  class: "CovidSenderWorker"
diff --git a/db/migrate/20170815155843_create_pairs.rb b/db/migrate/20170815155843_create_pairs.rb
index 7889063..d183d0a 100644
--- a/db/migrate/20170815155843_create_pairs.rb
+++ b/db/migrate/20170815155843_create_pairs.rb
@@ -7,6 +7,6 @@ def change
       t.references :first, null: true
       t.references :second, null: true
     end
-    add_index :pairs, [ :first_id, :second_id, :chat_id ], unique: true
+    add_index :pairs, %i[first_id second_id chat_id], unique: true
   end
 end
diff --git a/db/migrate/20170816162384_create_singles.rb b/db/migrate/20170816162384_create_singles.rb
index 773344f..7940521 100644
--- a/db/migrate/20170816162384_create_singles.rb
+++ b/db/migrate/20170816162384_create_singles.rb
@@ -5,10 +5,10 @@ def change
     create_table :singles do |t|
       t.references :chat,       null: false
       t.references :word,       null: false
-      t.integer    :reply_type, null: true,  limit: 1
       t.string     :reply,      null: false
+      t.integer    :reply_type, null: true,  limit: 1
       t.integer    :count,      null: false, limit: 8, default: 0
     end
-    add_index :singles, [ :word_id, :chat_id, :reply_type, :reply ], unique: true
+    add_index :singles, %i[word_id chat_id reply_type reply], unique: true
   end
 end
diff --git a/db/migrate/20171028053628_remove_one_world_sentences.rb b/db/migrate/20171028053628_remove_one_world_sentences.rb
index 7411ca8..2fb0f9e 100644
--- a/db/migrate/20171028053628_remove_one_world_sentences.rb
+++ b/db/migrate/20171028053628_remove_one_world_sentences.rb
@@ -3,6 +3,6 @@
 class RemoveOneWorldSentences < ActiveRecord::Migration[5.1]
   def change
     Reply.joins(:pair).where(word_id: nil, pairs: { first_id: nil }).destroy_all
-    Pair.includes(:replies).where(first_id: nil, replies: { id: nil } ).destroy_all
+    Pair.includes(:replies).where(first_id: nil, replies: { id: nil }).destroy_all
   end
 end
diff --git a/db/migrate/20171104065321_create_data_banks.rb b/db/migrate/20171104065321_create_data_banks.rb
index 9e14680..bee1ca3 100644
--- a/db/migrate/20171104065321_create_data_banks.rb
+++ b/db/migrate/20171104065321_create_data_banks.rb
@@ -7,7 +7,7 @@ def change
     end
     add_column :chats, :data_bank_ids, :jsonb, null: false, default: []
     add_column :pairs, :data_bank_id, :integer, null: true
-    remove_index :pairs, [ :first_id, :second_id, :chat_id ]
-    add_index :pairs, [ :first_id, :second_id, :chat_id, :data_bank_id ], unique: true, name: 'pairs_index'
+    remove_index :pairs, %i[first_id second_id chat_id]
+    add_index :pairs, %i[first_id second_id chat_id data_bank_id], unique: true, name: 'pairs_index'
   end
 end
diff --git a/db/migrate/20180203063658_add_dates_to_chat.rb b/db/migrate/20180203063658_add_dates_to_chat.rb
index ced894e..a493211 100644
--- a/db/migrate/20180203063658_add_dates_to_chat.rb
+++ b/db/migrate/20180203063658_add_dates_to_chat.rb
@@ -2,16 +2,21 @@
 
 class AddDatesToChat < ActiveRecord::Migration[5.1]
   def up
-    add_column :chats, :created_at, :datetime, null: false, default: Time.now
-    add_column :chats, :active_at, :datetime, null: true, default: nil
-    Chat.where(active: true).each { |c| c.update(active_at: Time.now) }
+    change_table :chats, bulk: true do |t|
+      t.datetime :chats, :created_at, null: false, default: Time.current
+      t.datetime :chats, :active_at, null: true, default: nil
+    end
+
+    Chat.where(active: true).each { |c| c.update(active_at: Time.current) }
     remove_column :chats, :active
   end
 
   def down
     add_column :chats, :active, :boolean, null: false, default: false
     Chat.where.not(active_at: nil).each { |c| c.update(active: true) }
-    remove_column :chats, :active_at
-    remove_column :chats, :created_at
+    change_table :chats, bulk: true do |t|
+      t.remove :created_at, type: :datetime, null: false, default: Time.current
+      t.remove :active_at, type: :datetime, null: true, default: nil
+    end
   end
 end
diff --git a/db/migrate/20210925130635_remove_urls_and_singles.rb b/db/migrate/20210925130635_remove_urls_and_singles.rb
index 1719707..b60669d 100644
--- a/db/migrate/20210925130635_remove_urls_and_singles.rb
+++ b/db/migrate/20210925130635_remove_urls_and_singles.rb
@@ -9,8 +9,8 @@ def change
     drop_table :singles do |t|
       t.references :chat,       null: false
       t.references :word,       null: false
-      t.integer    :reply_type, null: true,  limit: 1
       t.string     :reply,      null: false
+      t.integer    :reply_type, null: true,  limit: 1
       t.integer    :count,      null: false, limit: 8, default: 0
     end
   end
diff --git a/db/migrate/20211102090851_add_score_to_participation.rb b/db/migrate/20211102090851_add_score_to_participation.rb
index 3a3f88a..2c324c9 100644
--- a/db/migrate/20211102090851_add_score_to_participation.rb
+++ b/db/migrate/20211102090851_add_score_to_participation.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddScoreToParticipation < ActiveRecord::Migration[6.1]
   def change
     add_column :participations, :score, :integer, null: false, default: 0
diff --git a/db/migrate/20211102142926_add_date_to_winner.rb b/db/migrate/20211102142926_add_date_to_winner.rb
index beabb8d..cd6c17c 100644
--- a/db/migrate/20211102142926_add_date_to_winner.rb
+++ b/db/migrate/20211102142926_add_date_to_winner.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddDateToWinner < ActiveRecord::Migration[6.1]
   def change
     add_column :winners, :date, :date, null: true
diff --git a/db/migrate/20240120083027_remove_covid_stats.rb b/db/migrate/20240120083027_remove_covid_stats.rb
new file mode 100644
index 0000000..722409d
--- /dev/null
+++ b/db/migrate/20240120083027_remove_covid_stats.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class RemoveCovidStats < ActiveRecord::Migration[7.0]
+  def change
+    change_table :chats, bulk: true do |t|
+      t.remove :covid_region, type: :integer, null: true, default: nil
+      t.remove :covid_last_notification, type: :date, null: true
+    end
+
+    remove_index :covid_stats, %i[date region], unique: true
+    drop_table :covid_stats do |t|
+      t.integer :region, null: false
+      t.date    :date,   null: false
+      t.integer :sick,   null: true
+      t.integer :healed, null: true
+      t.integer :died,   null: true
+      t.integer :first,  null: true
+      t.integer :second, null: true
+
+      t.timestamps
+    end
+  end
+end
diff --git a/db/migrate/20240120084922_remove_cas_banner.rb b/db/migrate/20240120084922_remove_cas_banner.rb
new file mode 100644
index 0000000..f0ee61c
--- /dev/null
+++ b/db/migrate/20240120084922_remove_cas_banner.rb
@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class RemoveCasBanner < ActiveRecord::Migration[7.0]
+  def change
+    remove_column :chats, :casbanhammer_at, :datetime, null: true, default: nil
+
+    change_table :users, bulk: true do |t|
+      t.remove :casbanned_at, type: :datetime, null: true, default: nil
+      t.remove :casbanchecked_at, type: :datetime, null: true, default: nil
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index cb90cc2..b8ea5ae 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2022_05_28_175808) do
+ActiveRecord::Schema[7.0].define(version: 2024_01_20_084922) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -30,26 +30,10 @@
     t.datetime "created_at", precision: nil, null: false
     t.datetime "active_at", precision: nil
     t.string "kind", limit: 32
-    t.integer "covid_region"
-    t.date "covid_last_notification"
     t.date "date"
-    t.datetime "casbanhammer_at"
     t.index ["telegram_id"], name: "index_chats_on_telegram_id", unique: true
   end
 
-  create_table "covid_stats", force: :cascade do |t|
-    t.integer "region", null: false
-    t.date "date", null: false
-    t.integer "sick"
-    t.integer "healed"
-    t.integer "died"
-    t.integer "first"
-    t.integer "second"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
-    t.index ["date", "region"], name: "index_covid_stats_on_date_and_region", unique: true
-  end
-
   create_table "data_banks", force: :cascade do |t|
     t.string "name", null: false
   end
@@ -101,8 +85,6 @@
     t.string "language_code"
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
-    t.datetime "casbanned_at", precision: nil
-    t.datetime "casbanchecked_at", precision: nil
   end
 
   create_table "winners", force: :cascade do |t|
diff --git a/docker-compose.yaml b/docker-compose.yaml
index c2db8d5..face3db 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -15,8 +15,8 @@ services:
       - ./:/opt/app/src/
     command: bundle exec sidekiq -C config/sidekiq.yml
     depends_on:
-      - postgres
-      - redis
+      - database
+      - cache
 
   app:
     <<: *sidekiq
@@ -39,8 +39,10 @@ services:
       RAILS_ENV: test
     command: sh -c "bundle exec rails db:migrate && bundle exec guard start --no-bundler-warning"
 
-  redis:
-    image: redis:6-alpine
+  cache:
+    image: redis:alpine
+    ulimits:
+      memlock: -1
     restart: unless-stopped
     ports:
       - 6379:6379
@@ -50,8 +52,8 @@ services:
       timeout: 3s
       retries: 30
 
-  postgres:
-    image: postgres:14-alpine
+  database:
+    image: postgres:alpine
     env_file: .env.test
     environment:
       POSTGRES_USER: ${DATABASE_USERNAME}
@@ -64,23 +66,3 @@ services:
       interval: 10s
       timeout: 5s
       retries: 30
-
-  # receiver:
-  #   build:
-  #     context: ./receiver
-  #     target: dev
-  #     dockerfile: ./../config/deploy/Dockerfile.receiver
-  #   volumes:
-  #     - ./receiver:/opt/app
-  #   ports:
-  #   - 8181:8080
-    # - 2345:2345
-
-    # tor:
-  #   build:
-  #     context: config/deploy/
-  #     dockerfile: Dockerfile.tor
-  #     args:
-  #       CONTAINER_GID: '${CONTAINER_GID:-1000}'
-  #       CONTAINER_UID: '${CONTAINER_UID:-1000}'
-  #   restart: unless-stopped
diff --git a/lib/tasks/databank.rake b/lib/tasks/databank.rake
index f79ac61..436e5ee 100644
--- a/lib/tasks/databank.rake
+++ b/lib/tasks/databank.rake
@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
 namespace :databank do
-  task :delete, [:id] => :environment do |t, args|
+  task :delete, [:id] => :environment do |_, args|
     if args.count.zero?
       puts 'Specify databank ID'
       break
     end
     id = args[:id].to_i
-    databank = DataBank.find_by(id: id)
-    if id.zero? || !databank.present?
+    databank = DataBank.find_by(id:)
+    if id.zero? || databank.blank?
       puts 'Wrong databank ID'
       break
     end
@@ -19,10 +19,10 @@ namespace :databank do
   task list: :environment do
     databanks = DataBank.pluck(:id, :name)
     puts "Available Databanks: #{databanks.count}"
-    puts DataBank.pluck(:id, :name).map {|d| "#{d.first}: #{d.second}"}.join("\n")
+    puts DataBank.pluck(:id, :name).map { |d| "#{d.first}: #{d.second}" }.join("\n")
   end
 
-  task :import, [:name, :file] => :environment do |t, args|
+  task :import, %i[name file] => :environment do |_, args|
     unless args[:name].present? && args[:file].present?
       puts 'Specify databank name and filename'
       break
@@ -31,18 +31,18 @@ namespace :databank do
     words = File.read(args[:file]).downcase.split(' ')
     databank = DataBank.create!(name: args[:name])
     puts "Creating databank #{databank.name} with id#{databank.id}"
-    Pair.learn(chat_id: nil, data_bank_id: databank.id, words: words)
-    puts "Done!"
+    Pair.learn(chat_id: nil, data_bank_id: databank.id, words:)
+    puts 'Done!'
   end
 
-  task :update, [:id, :file] => :environment do |t, args|
+  task :update, %i[id file] => :environment do |_, args|
     id = args[:id].to_i
-    databank = DataBank.find_by(id: id)
-    if id.zero? || !databank.present?
+    databank = DataBank.find_by(id:)
+    if id.zero? || databank.blank?
       puts 'Wrong databank ID'
       break
     end
-    unless args[:file].present?
+    if args[:file].blank?
       puts 'Specify filename'
       break
     end
@@ -51,7 +51,7 @@ namespace :databank do
     puts 'Removing old data…'
     Pair.where(chat_id: nil, data_bank_id: databank.id).destroy_all
     puts 'Learning new data…'
-    Pair.learn(chat_id: nil, data_bank_id: databank.id, words: words)
+    Pair.learn(chat_id: nil, data_bank_id: databank.id, words:)
     puts 'Done'
   end
 end
diff --git a/receiver/_dev_start.sh b/receiver/_dev_start.sh
deleted file mode 100755
index a09cd4e..0000000
--- a/receiver/_dev_start.sh
+++ /dev/null
@@ -1,5 +0,0 @@
-#!/bin/sh
-
-go mod download
-go mod verify
-air
diff --git a/receiver/go.mod b/receiver/go.mod
deleted file mode 100644
index 1eef4cf..0000000
--- a/receiver/go.mod
+++ /dev/null
@@ -1,11 +0,0 @@
-module shizoid/receiver
-
-go 1.17
-
-require github.com/Scalingo/go-workers v0.0.0-20150506000945-5a3fe4ca9668
-
-require (
-	github.com/bitly/go-simplejson v0.5.0 // indirect
-	github.com/garyburd/redigo v1.6.3 // indirect
-	github.com/jrallison/go-workers v0.0.0-20180112190529-dbf81d0b75bb // indirect
-)
diff --git a/receiver/go.sum b/receiver/go.sum
deleted file mode 100644
index f2aa247..0000000
--- a/receiver/go.sum
+++ /dev/null
@@ -1,8 +0,0 @@
-github.com/Scalingo/go-workers v0.0.0-20150506000945-5a3fe4ca9668 h1:amu2fnl1Q4c7l6AS+mTF25dpgUjMOLeufbCIUEaQbRQ=
-github.com/Scalingo/go-workers v0.0.0-20150506000945-5a3fe4ca9668/go.mod h1:QOmn02w4gJ/97T2WOkK9SNhLRmzXTi7tKQDqxm/aMXM=
-github.com/bitly/go-simplejson v0.5.0 h1:6IH+V8/tVMab511d5bn4M7EwGXZf9Hj6i2xSwkNEM+Y=
-github.com/bitly/go-simplejson v0.5.0/go.mod h1:cXHtHw4XUPsvGaxgjIAn8PhEWG9NfngEKAMDJEczWVA=
-github.com/garyburd/redigo v1.6.3 h1:HCeeRluvAgMusMomi1+6Y5dmFOdYV/JzoRrrbFlkGIc=
-github.com/garyburd/redigo v1.6.3/go.mod h1:rTb6epsqigu3kYKBnaF028A7Tf/Aw5s0cqA47doKKqw=
-github.com/jrallison/go-workers v0.0.0-20180112190529-dbf81d0b75bb h1:y9LFhCM3gwK94Xz9/h7GcSVLteky9pFHEkP04AqQupA=
-github.com/jrallison/go-workers v0.0.0-20180112190529-dbf81d0b75bb/go.mod h1:ziQRRNHCWZe0wVNzF8y8kCWpso0VMpqHJjB19DSenbE=
diff --git a/receiver/main.go b/receiver/main.go
deleted file mode 100644
index 5692012..0000000
--- a/receiver/main.go
+++ /dev/null
@@ -1,65 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"log"
-	"net/http"
-
-	"github.com/Scalingo/go-workers"
-)
-
-func main() {
-
-	http.HandleFunc("/", HelloHandler)
-	fmt.Println("Server at port 8080")
-	log.Fatal(http.ListenAndServe(":8080", nil))
-
-	workers.Configure(map[string]string{
-		"process": "client1",
-		"server":  "redis:6379",
-	})
-	workers.Enqueue("default", "UpdateWorker", []string{"[\"hello\"]"})
-}
-
-func HelloHandler(w http.ResponseWriter, r *http.Request) {
-	fmt.Fprintf(w, "Hello, there\n")
-}
-
-// package main
-
-// import (
-//     "encoding/json"
-// "github.com/Scalingo/go-workers"
-//     "log"
-//     "net/http"
-//     "io/ioutil"
-// )
-
-// type test_struct struct {
-//     Test string
-// }
-
-// func test(rw http.ResponseWriter, req *http.Request) {
-//     body, err := ioutil.ReadAll(req.Body)
-//     if err != nil {
-//         panic(err)
-//     }
-//     log.Println(string(body))
-//     var t test_struct
-//     err = json.Unmarshal(body, &t)
-//     if err != nil {
-//         panic(err)
-//     }
-//     log.Println(t.Test)
-// }
-
-// func main() {
-// 	workers.Configure(map[string]string{
-// 		"process": "client1",
-// 		"server":  "localhost:6379",
-// 	})
-// 	workers.Enqueue("myqueue", "MyRubyWorker", []string{"hello"})
-
-// 	http.HandleFunc("/test", test)
-//     log.Fatal(http.ListenAndServe(":8082", nil))
-// }
diff --git a/spec/factories/chat.rb b/spec/factories/chat.rb
index d2702b9..edde292 100644
--- a/spec/factories/chat.rb
+++ b/spec/factories/chat.rb
@@ -8,7 +8,6 @@
     eightball       { [true, false].sample }
     greeting        { [true, false].sample }
     winner          { FFaker::Name.first_name }
-    covid_region    { CovidStat::FETCHABLE_REGIONS.sample }
     locale          { 'ru' }
     first_name      { FFaker::Name.first_name }
     last_name       { FFaker::Name.last_name }
@@ -17,11 +16,6 @@
     active_at       { 10.minutes.ago }
     title           { FFaker::Job.title }
     data_bank_ids   { [] }
-    casbanhammer_at { nil }
-
-    trait :casban_enabled do
-      casbanhammer_at { 1.day.ago }
-    end
 
     trait :disabled_random do
       random { 100 }
diff --git a/spec/factories/covid_stat.rb b/spec/factories/covid_stat.rb
deleted file mode 100644
index 1d345a1..0000000
--- a/spec/factories/covid_stat.rb
+++ /dev/null
@@ -1,13 +0,0 @@
-# frozen_string_literal: true
-
-FactoryBot.define do
-  factory :covid_stat do
-    region { CovidStat::FETCHABLE_REGIONS.sample }
-    date   { Time.current.to_date }
-    sick   { Random.rand(999) }
-    healed { Random.rand(999) }
-    died   { Random.rand(999) }
-    first  { Random.rand(999) }
-    second { Random.rand(999) }
-  end
-end
diff --git a/spec/factories/telegram/message.rb b/spec/factories/telegram/message.rb
index 753d882..3755379 100644
--- a/spec/factories/telegram/message.rb
+++ b/spec/factories/telegram/message.rb
@@ -63,7 +63,7 @@
     end
 
     trait :command_databank_enable do
-      text     { "/databank enable" }
+      text     { '/databank enable' }
       entities { [{ type: 'bot_command', offset: 0, length: 9 }] }
     end
 
@@ -77,26 +77,6 @@
       entities { [{ type: 'bot_command', offset: 0, length: 9 }] }
     end
 
-    trait :command_covid_stats_enable do
-      text     { "/covid_stats enable #{CovidStat.regions.keys.sample}" }
-      entities { [{ type: 'bot_command', offset: 0, length: 12 }] }
-    end
-
-    trait :command_covid_stats_disable do
-      text     { '/covid_stats disable' }
-      entities { [{ type: 'bot_command', offset: 0, length: 12 }] }
-    end
-
-    trait :command_covid_stats_available do
-      text     { '/covid_stats available' }
-      entities { [{ type: 'bot_command', offset: 0, length: 12 }] }
-    end
-
-    trait :command_covid_stats do
-      text     { '/covid_stats' }
-      entities { [{ type: 'bot_command', offset: 0, length: 12 }] }
-    end
-
     trait :command_winner_enable do
       text     { "/winner enable #{FFaker::Lorem.word}" }
       entities { [{ type: 'bot_command', offset: 0, length: 7 }] }
@@ -183,7 +163,7 @@
     end
 
     trait :command_empty_eightball do
-      text     { "/eightball" }
+      text     { '/eightball' }
       entities { [{ type: 'bot_command', offset: 0, length: 10 }] }
     end
 
@@ -195,21 +175,5 @@
     trait :new_chat_members do
       new_chat_members { Array.new(2) { association :tg_user } }
     end
-
-    trait :command_cas_enable do
-      text     { "/cas enable #{CovidStat.regions.keys.sample}" }
-      entities { [{ type: 'bot_command', offset: 0, length: 4 }] }
-    end
-
-    trait :command_cas_disable do
-      text     { '/cas disable' }
-      entities { [{ type: 'bot_command', offset: 0, length: 4 }] }
-    end
-
-    trait :command_cas do
-      text     { '/cas' }
-      entities { [{ type: 'bot_command', offset: 0, length: 4 }] }
-    end
-
   end
 end
diff --git a/spec/factories/user.rb b/spec/factories/user.rb
index 9e4baa7..0cd418e 100644
--- a/spec/factories/user.rb
+++ b/spec/factories/user.rb
@@ -5,15 +5,9 @@
     first_name       { FFaker::Name.first_name }
     last_name        { FFaker::Name.last_name }
     username         { FFaker::Internet.user_name }
-    casbanned_at     { nil }
-    casbanchecked_at { 1.minute.ago }
 
     trait :bot_owner do
       id { Rails.application.secrets[:telegram][:owners].sample.to_i }
     end
-
-    trait :casbanned do
-      casbanned_at { 1.day.ago.round }
-    end
   end
 end
diff --git a/spec/models/chat_spec.rb b/spec/models/chat_spec.rb
index 2141453..eedd90b 100644
--- a/spec/models/chat_spec.rb
+++ b/spec/models/chat_spec.rb
@@ -18,10 +18,15 @@
   end
 
   describe '#choose_winner!' do
-    subject(:method_call) { chat.choose_winner!}
+    subject(:method_call) { chat.choose_winner! }
 
-    let!(:participations) { create_list :participation, 5, chat: chat }
-    let!(:candidates)     { chat.participations.scored.order(score: :desc).limit(3).map { |p| p.user.id } }
+    let(:participations) { create_list :participation, 5, chat: }
+    let(:candidates)     { chat.participations.scored.order(score: :desc).limit(3).map { |p| p.user.id } }
+
+    before do
+      participations
+      candidates
+    end
 
     it { expect(method_call).to be_a User }
 
diff --git a/spec/models/covid_stat_spec.rb b/spec/models/covid_stat_spec.rb
deleted file mode 100644
index bb2d606..0000000
--- a/spec/models/covid_stat_spec.rb
+++ /dev/null
@@ -1,136 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe CovidStat, type: :model do
-  let(:stat)    { create :covid_stat }
-  let(:regions) { CovidStat::FETCHABLE_REGIONS.sample(3) }
-  let(:region)  { regions.sample }
-  let(:stub)    { webmocks(:stop_covid, :get_region_stats, region_id: region) }
-  let(:chat)    { create :chat }
-
-  describe 'validations with' do
-    let(:virtual_region) { build(:covid_stat, region: described_class::VIRTUAL_REGIONS.sample) }
-
-    it 'valid factory' do
-      expect(stat).to be_valid
-    end
-
-    it 'virtual region' do
-      expect(virtual_region).not_to be_valid
-    end
-  end
-
-  describe ':day_stat' do
-    let(:stats) do
-      regions.map do |r|
-        [create(:covid_stat, region: r, sick: 1, healed: 1, died: 1, first: 1, second: 1, date: Time.zone.yesterday),
-         create(:covid_stat, region: r, sick: 3, healed: 4, died: 5, first: 6, second: 7, date: Time.zone.today)]
-      end.flatten
-    end
-
-    describe 'shows current stats' do
-      subject(:call_method) { described_class.day_stats(region: region) }
-
-      before { stats }
-
-      it 'date' do
-        expect(call_method[:date]).to eq Time.zone.today
-      end
-
-      context 'when region set to ALL' do
-        let(:region) { 'ALL' }
-
-        it 'sick' do
-          expect(call_method[:delta][:sick]).to eq 2 * regions.size
-        end
-
-        it 'healed' do
-          expect(call_method[:delta][:healed]).to eq 3 * regions.size
-        end
-
-        it 'died' do
-          expect(call_method[:delta][:died]).to eq 4 * regions.size
-        end
-
-        # it 'first' do
-        #   expect(call_method[:delta][:first]).to eq 5 * regions.size
-        # end
-
-        # it 'second' do
-        #   expect(call_method[:delta][:second]).to eq 6 * regions.size
-        # end
-      end
-
-      context 'when region specified' do
-        it 'sick' do
-          expect(call_method[:delta][:sick]).to eq 2
-        end
-
-        it 'healed' do
-          expect(call_method[:delta][:healed]).to eq 3
-        end
-
-        it 'died' do
-          expect(call_method[:delta][:died]).to eq 4
-        end
-
-        # it 'first' do
-        #   expect(call_method[:delta][:first]).to eq 5
-        # end
-
-        # it 'second' do
-        #   expect(call_method[:delta][:second]).to eq 6
-        # end
-      end
-    end
-  end
-
-  describe ':needs_update?' do
-    subject(:call) { described_class.needs_update? }
-
-    before do
-      stub
-      stub_const('CovidStat::FETCHABLE_REGIONS', [region])
-    end
-
-    it 'makes request' do
-      call
-      expect(stub[:mock]).to have_been_requested
-    end
-
-    it 'has new stats' do
-      expect(call).to be_truthy
-    end
-
-    it 'has no new stats' do
-      described_class.update(region)
-      expect(call).to be_falsy
-    end
-  end
-
-  describe ':update_all' do
-    subject(:call) { described_class.update_all }
-
-    it 'enqueues a worker for each region' do
-      expect { call }
-        .to change(CovidRegionUpdaterWorker.jobs, :size)
-        .by(described_class::FETCHABLE_REGIONS.size)
-    end
-  end
-
-  describe ':update' do
-    subject(:call) { described_class.update region }
-
-    before { stub }
-
-    it 'makes request' do
-      call
-      expect(stub[:mock]).to have_been_requested
-    end
-
-    it 'creates new record' do
-      expect { call }.to change(described_class, :count).by(30)
-    end
-  end
-end
diff --git a/spec/models/pair_spec.rb b/spec/models/pair_spec.rb
index 1277d28..9d6d026 100644
--- a/spec/models/pair_spec.rb
+++ b/spec/models/pair_spec.rb
@@ -13,9 +13,9 @@
     expect(pair).to be_valid
   end
 
-  it { should belong_to(:first).optional }
-  it { should belong_to(:second).optional }
-  it { should have_many(:replies) }
+  it { is_expected.to belong_to(:first).optional }
+  it { is_expected.to belong_to(:second).optional }
+  it { is_expected.to have_many(:replies) }
 
   describe 'validates pair belonging' do
     let(:chat)      { create :chat }
@@ -28,41 +28,40 @@
     end
 
     context 'with chat and data bank' do
-      subject(:result) { build :pair, chat: chat, data_bank: data_bank }
+      subject(:result) { build :pair, chat:, data_bank: }
 
-      it { expect(result).not_to be_valid}
+      it { expect(result).not_to be_valid }
     end
 
     context 'with chat' do
-      subject(:result) { build :pair, chat: chat, data_bank: nil }
+      subject(:result) { build :pair, chat:, data_bank: nil }
 
-      it { expect(result).to be_valid}
+      it { expect(result).to be_valid }
     end
 
     context 'with data bank' do
-      subject(:result) { build :pair, chat: nil, data_bank: data_bank }
+      subject(:result) { build :pair, chat: nil, data_bank: }
 
-      it { expect(result).to be_valid}
+      it { expect(result).to be_valid }
     end
   end
 
   describe '::build sentence' do
-    subject(:result) { described_class.build_sentence chat: chat, words: words }
+    subject(:result) { described_class.build_sentence chat:, words: }
 
     let(:chat)      { create :chat }
     let(:words)     { FFaker::Lorem.sentences.join(' ').split.uniq }
-    let(:sentences) { words.join(' ').split('.').map{ |s| "#{s.strip}." } }
+    let(:sentences) { words.join(' ').split('.').map { |s| "#{s.strip}." } }
 
-    before { described_class.learn(chat: chat, words: words) }
+    before { described_class.learn(chat:, words:) }
 
     it 'generates one of the old phrases' do
       expect(sentences).to include result
     end
   end
 
-
   describe '::learn' do
-    subject(:result) { described_class.learn(chat: chat, words: words) }
+    subject(:result) { described_class.learn(chat:, words:) }
 
     let(:chat)            { create :chat }
     let(:words)           { FFaker::Lorem.sentences.join(' ').split.uniq }
@@ -90,24 +89,23 @@
     describe 'creates pairs' do
       it 'correct count' do
         predictable_count = words.size + sentences_count
-        expect { result }.to change(Pair, :count).by(predictable_count)
+        expect { result }.to change(described_class, :count).by(predictable_count)
       end
 
       it 'correct first words' do
         result
-        first_words = Pair.all.map { |p| p.first&.word }.compact
+        first_words = described_class.all.map { |p| p.first&.word }.compact
         expect(first_words).to eq words
       end
 
       it 'correct second words' do
         result
-        second_words = Pair.all.map { |p| p.second&.word }.compact
+        second_words = described_class.all.map { |p| p.second&.word }.compact
         expect(second_words).to eq words
       end
     end
   end
 
-
   # it '::to_words' do
   #   result = described_class.to_words(known_ids)
   #   expect(result).to eq known_words
diff --git a/spec/models/participation_spec.rb b/spec/models/participation_spec.rb
index 1e51033..2fc3042 100644
--- a/spec/models/participation_spec.rb
+++ b/spec/models/participation_spec.rb
@@ -7,7 +7,7 @@
   let(:tg_user)       { build :tg_user }
   let(:chat)          { create :chat, telegram_id: tg_chat.id }
   let(:user)          { create :user, id: tg_user.id }
-  let(:participation) { create :participation, user: user, chat: chat }
+  let(:participation) { create :participation, user:, chat: }
   let(:message)       { build :tg_message, chat: tg_chat, from: tg_user }
   let(:leave_message) { build :tg_message, chat: tg_chat, from: tg_user, left_chat_member: tg_user }
 
@@ -15,60 +15,6 @@
     expect(participation).to be_valid
   end
 
-  describe 'ban' do
-    subject(:method_call) { participation.ban }
-
-    let(:user) { create :user, :casbanned }
-
-    it 'updates participation status' do
-      expect { method_call }.to change(participation, :left).from(false).to(true)
-    end
-
-    it 'sends ban command to tg' do
-      allow(SendPayloadWorker).to receive(:perform_async)
-
-      method_call
-
-      expect(SendPayloadWorker).to have_received(:perform_async).exactly(Rails.application.secrets[:telegram][:owners].size).times
-    end
-  end
-
-  describe 'ban_all' do
-    subject(:method_call) { described_class.ban_all }
-
-    let(:cas_chat)              { create :chat, :casban_enabled }
-    let(:banned_user)           { create :user, :casbanned }
-    let(:banned_participations) { create_list :participation, 5, user: banned_user }
-    let(:target_participation)  { create :participation, user: banned_user, chat: cas_chat }
-    let(:participations)        { banned_participations.map { |p| create :participation, chat: p.chat } }
-
-    before do
-      participations
-      target_participation
-    end
-
-    it "doesn't update other users participations" do
-      expect do
-        method_call
-        participations.each(&:reload)
-      end.not_to change { participations.map(&:left) }
-    end
-
-    it "doesn't update participations with cas turned off" do
-      expect do
-        method_call
-        banned_participations.each(&:reload)
-      end.not_to change { banned_participations.map(&:left) }
-    end
-
-    it 'updates participation status' do
-      expect do
-        method_call
-        target_participation.reload
-      end.to change(target_participation, :left)
-    end
-  end
-
   describe 'learn' do
     it 'creates participation' do
       chat
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 449a5df..63d47e4 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -7,7 +7,7 @@
   let(:user)    { create :user, id: tg_user.id }
   let(:message) { build :tg_message, from: tg_user }
 
-  it { should have_many(:chats).through(:participations) }
+  it { is_expected.to have_many(:chats).through(:participations) }
 
   it 'has valid factory' do
     expect(user).to be_valid
@@ -23,49 +23,6 @@
     expect(user.to_s).to eq name
   end
 
-  describe 'update_casban' do
-    subject(:update_result) { user.update_casban }
-
-    before { webmocks(:cas, :check, telegram_id: user.id, banned: true) }
-
-    context 'when already updated' do
-      let(:user) { create :user, :casbanned, casbanchecked_at: 1.day.ago.round }
-
-      it "doesn't call CasService" do
-        allow(CasService).to receive(:banned?)
-        update_result
-        expect(CasService).not_to have_received(:banned?)
-      end
-
-      it "doesn't update casbanchecked_at and casbanned_at" do
-        user
-        expect do
-          update_result
-          user.reload
-        end.not_to change(user, :casbanchecked_at)
-      end
-    end
-
-    context 'when first time to update' do
-      let(:user) { create :user, casbanned_at: nil, casbanchecked_at: nil }
-
-      it 'updates casbanchecked_at and casbanned_at' do
-        user
-        expect do
-          update_result
-          user.reload
-        end.to(change(user, :casbanned_at)
-          .and(change(user, :casbanchecked_at)))
-      end
-
-      it 'calls CasService' do
-        allow(CasService).to receive(:banned?)
-        update_result
-        expect(CasService).to have_received(:banned?).with(user.id)
-      end
-    end
-  end
-
   describe 'learn' do
     subject(:learn_result) { described_class.learn(tg_user) }
 
diff --git a/spec/models/word_spec.rb b/spec/models/word_spec.rb
index c157e2a..825f1e2 100644
--- a/spec/models/word_spec.rb
+++ b/spec/models/word_spec.rb
@@ -25,12 +25,12 @@
 
   describe '::learn' do
     it 'learns new words' do
-      expect { described_class.learn new_words }.to change(Word, :count).by new_words.size
+      expect { described_class.learn new_words }.to change(described_class, :count).by new_words.size
     end
 
     it "doesn't add already known words" do
       described_class.learn new_words
-      expect { described_class.learn new_words }.not_to change(Word, :count)
+      expect { described_class.learn new_words }.not_to change(described_class, :count)
     end
   end
 end
diff --git a/spec/processors/concerns/processor_spec.rb b/spec/processors/concerns/processor_spec.rb
index 3749597..bedfe64 100644
--- a/spec/processors/concerns/processor_spec.rb
+++ b/spec/processors/concerns/processor_spec.rb
@@ -15,7 +15,7 @@ def process!
 RSpec.describe MessageProcessor::ProcessorConcernStub, type: :processor do
   subject(:instance) { described_class.new(active_command) }
 
-  let(:participation)     { create :participation, user: user, chat: active_chat}
+  let(:participation)     { create :participation, user:, chat: active_chat }
   let(:user)              { create :user }
   let(:active_chat)       { create :chat }
   let(:inactive_chat)     { create :chat, :disabled }
@@ -45,7 +45,9 @@ def process!
     end
 
     context 'with username' do
-      let(:active_command) { build :tg_message, :command_me_username, from: { id: user.id }, chat: { id: active_chat.telegram_id } }
+      let(:active_command) do
+        build :tg_message, :command_me_username, from: { id: user.id }, chat: { id: active_chat.telegram_id }
+      end
 
       it 'returns bare command' do
         expect(instance.send(:command)).to eq 'me'
diff --git a/spec/processors/message_processor/binary_dice_spec.rb b/spec/processors/message_processor/binary_dice_spec.rb
index ac3365c..c391bea 100644
--- a/spec/processors/message_processor/binary_dice_spec.rb
+++ b/spec/processors/message_processor/binary_dice_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 RSpec.describe MessageProcessor::BinaryDice, type: :processor do
@@ -5,7 +7,7 @@
 
   let(:instance)       { described_class.new(message) }
   let(:user)           { create :user }
-  let(:message_params) { { text: text, chat: { id: chat.telegram_id }, from: { id: user.id } } }
+  let(:message_params) { { text:, chat: { id: chat.telegram_id }, from: { id: user.id } } }
   let(:message)        { build :tg_message, message_params }
   let(:chat)           { create :chat, :disabled_random }
 
diff --git a/spec/processors/message_processor/cas_banner_spec.rb b/spec/processors/message_processor/cas_banner_spec.rb
deleted file mode 100644
index 9a867e4..0000000
--- a/spec/processors/message_processor/cas_banner_spec.rb
+++ /dev/null
@@ -1,69 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe MessageProcessor::CasBanner, type: :processor do
-  subject(:result) { described_class.new(message).process }
-
-  let(:user)           { create :user }
-  let(:chat)           { create :chat, :disabled_random }
-  let(:message_params) { { chat: { id: chat.telegram_id }, from: { id: user.id } } }
-  let(:message)        { build :tg_message, message_params }
-
-  describe '#background_task' do
-    let(:message)        { build :tg_message, :new_chat_members, message_params }
-    let(:stubs)          { message.new_chat_members.map { |m| webmocks(:cas, :check, telegram_id: m.id, banned: true) } }
-    let(:participations) { create_list(:participation, 2, chat: chat) }
-
-    before do
-      participations
-      stubs
-    end
-
-    it 'makes requests' do
-      result
-      stubs.each { |s| expect(s[:mock]).to have_been_requested }
-    end
-
-    it "create's users" do
-      user
-      expect { result }.to change(User, :count).by(2)
-    end
-  end
-
-  describe 'show' do
-    let(:message) { build :tg_message, :command_cas, message_params }
-
-    it 'without text replies with some stats' do
-      chat.users << create(:user, :casbanned)
-      create(:user, :casbanned)
-      expect(result[:send_message][:text]).to eq "*Активен:* Нет\n*Всего:* 2\n*В этом чате:* 1\n\nPowered by [CAS](https://cas.chat/)\n"
-      expect(result[:send_message][:parse_mode]).to eq :markdown
-    end
-  end
-
-  describe 'enable' do
-    let(:message) { build :tg_message, :command_cas_enable, message_params }
-
-    it 'changes casbanhammer_at to current date' do
-      chat
-      expect do
-        result
-        chat.reload
-      end.to change(chat, :casbanhammer_at).from(nil)
-    end
-  end
-
-  describe 'disable' do
-    let(:message) { build :tg_message, :command_cas_disable, message_params }
-    let(:chat)    { create :chat, :casban_enabled, :disabled_random }
-
-    it 'changes casbanhammer_at to nil' do
-      chat
-      expect do
-        result
-        chat.reload
-      end.to change(chat, :casbanhammer_at).to(nil)
-    end
-  end
-end
diff --git a/spec/processors/message_processor/cool_story_spec.rb b/spec/processors/message_processor/cool_story_spec.rb
index c6117c2..3453b03 100644
--- a/spec/processors/message_processor/cool_story_spec.rb
+++ b/spec/processors/message_processor/cool_story_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 RSpec.describe MessageProcessor::CoolStory, type: :processor do
diff --git a/spec/processors/message_processor/covid_stats_spec.rb b/spec/processors/message_processor/covid_stats_spec.rb
deleted file mode 100644
index b46f4dc..0000000
--- a/spec/processors/message_processor/covid_stats_spec.rb
+++ /dev/null
@@ -1,195 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe MessageProcessor::CovidStats, type: :processor do
-  subject(:process_method) { instance.process }
-
-  let(:instance)       { described_class.new(message) }
-  let(:user)           { create :user }
-  let(:message_params) { { chat: { id: chat.telegram_id }, from: { id: user.id } } }
-  let(:message)        { build :tg_message, message_params }
-  let(:chat)           { create :chat, :disabled_random }
-  let(:regions)        { CovidStat::FETCHABLE_REGIONS.sample(3) }
-  let(:region)         { regions.sample }
-
-  let(:stats) do
-    regions.map do |r|
-      [create(:covid_stat, region: r, sick: 1, healed: 1, died: 1, first: 1, second: 1, date: Time.zone.yesterday),
-       create(:covid_stat, region: r, sick: 3, healed: 4, died: 5, first: 6, second: 7, date: Time.zone.today)]
-    end.flatten
-  end
-
-  context 'when empty command' do
-    let(:message) { build :tg_message, :command_covid_stats, message_params }
-
-    describe 'responds with send_message' do
-      subject(:send_message) { process_method[:send_message] }
-
-      let(:expected_result) do
-        results = CovidStat.day_stats(region: region)
-        printable_results = CovidStat::STATISTICS_ATTRIBUTES.map do |a|
-          current = results[:current].send(a) || '?'
-          delta = "+#{results[:delta][a]}"
-          [a, "#{current} (#{delta})"]
-        end.to_h
-
-        I18n.t('covid_stat.stats_html', region: I18n.t("covid_stat.regions.#{region}"),
-                                        date: results[:date],
-                                        sick: printable_results[:sick],
-                                        healed: printable_results[:healed],
-                                        died: printable_results[:died])
-      end
-
-      before { stats }
-
-      it 'chat_id' do
-
-        expect(send_message[:chat_id]).to eq chat.telegram_id
-      end
-
-      it 'reply_to_message_id' do
-        expect(send_message[:reply_to_message_id]).to eq message.message_id
-      end
-
-      it 'parse_mode' do
-        expect(send_message[:parse_mode]).to eq :html
-      end
-
-      context "when there's no region set" do
-        let(:chat)   { create :chat, :disabled_random, covid_region: nil }
-        let(:region) { 'ALL' }
-
-        it 'shows latest overall data' do
-          expect(send_message[:text]).to eq expected_result
-        end
-      end
-
-      context 'when region is set to ALL' do
-        let(:chat)   { create :chat, :disabled_random, covid_region: 'ALL' }
-        let(:region) { 'ALL' }
-
-        it 'shows latest overall data' do
-          expect(send_message[:text]).to eq expected_result
-        end
-      end
-
-      context 'when region is set to real region' do
-        let(:chat) { create :chat, :disabled_random, covid_region: region }
-
-        it 'shows latest region data' do
-          expect(send_message[:text]).to eq expected_result
-        end
-      end
-    end
-  end
-
-  context 'when available command' do
-    let(:message) { build :tg_message, :command_covid_stats_available, message_params }
-
-    describe 'responds with send_message' do
-      subject(:send_message) { process_method[:send_message] }
-
-      let(:participations) { create_list :participation, 15, chat: chat }
-
-      it 'chat_id' do
-        expect(send_message[:chat_id]).to eq chat.telegram_id
-      end
-
-      it 'reply_to_message_id' do
-        expect(send_message[:reply_to_message_id]).to eq message.message_id
-      end
-
-      it 'parse_mode' do
-        expect(send_message[:parse_mode]).to eq :html
-      end
-
-      it 'text' do
-        list = I18n.t('covid_stat.regions').map do |key, name|
-          I18n.t('covid_stat.region_item_html', key: key.to_s.rjust(4), name: name)
-        end
-
-        expect(send_message[:text]).to eq I18n.t('covid_stat.region_list_html', items: list.join("\n"))
-      end
-    end
-  end
-
-  context 'when enable command' do
-    let(:chat) { create :chat, :disabled_random, covid_region: nil }
-
-    shared_examples 'command enabler' do
-      it 'changes covid_region attribute' do
-        expect do
-          process_method
-          chat.reload
-        end.to change(chat, :covid_region).to(region)
-      end
-
-      describe 'responds with send_message' do
-        subject(:send_message) { process_method[:send_message] }
-
-        it 'chat_id' do
-          expect(send_message[:chat_id]).to eq chat.telegram_id
-        end
-
-        it 'reply_to_message_id' do
-          expect(send_message[:reply_to_message_id]).to eq message.message_id
-        end
-
-        it 'text' do
-          expect(I18n.t('.ok')).to include send_message[:text]
-        end
-      end
-    end
-
-    context 'without region' do
-      let(:message) { build :tg_message, :command_covid_stats_enable, message_params.merge!(text: '/covid_stats enable') }
-      let(:region)  { 'ALL' }
-
-      it_behaves_like 'command enabler'
-    end
-
-    context 'with all region' do
-      let(:message) { build :tg_message, :command_covid_stats_enable, message_params.merge!(text: '/covid_stats enable all') }
-      let(:region)  { 'ALL' }
-
-      it_behaves_like 'command enabler'
-    end
-
-    context 'with some region' do
-      let(:message) do
-        command = "/covid_stats enable #{region}"
-        build :tg_message, :command_covid_stats_enable, message_params.merge!(text: command)
-      end
-
-      it_behaves_like 'command enabler'
-    end
-  end
-
-  context 'when disable command' do
-    let(:message) { build :tg_message, :command_covid_stats_disable, message_params }
-
-    it 'changes covid_region attribute' do
-      expect do
-        process_method
-        chat.reload
-      end.to change(chat, :covid_region).to(nil)
-    end
-
-    describe 'responds with send_message' do
-      subject(:send_message) { process_method[:send_message] }
-
-      it 'chat_id' do
-        expect(send_message[:chat_id]).to eq chat.telegram_id
-      end
-
-      it 'reply_to_message_id' do
-        expect(send_message[:reply_to_message_id]).to eq message.message_id
-      end
-
-      it 'text' do
-        expect(I18n.t('.ok')).to include send_message[:text]
-      end
-    end
-  end
-end
diff --git a/spec/processors/message_processor/databank_spec.rb b/spec/processors/message_processor/databank_spec.rb
index 3791391..6c49a62 100644
--- a/spec/processors/message_processor/databank_spec.rb
+++ b/spec/processors/message_processor/databank_spec.rb
@@ -18,9 +18,9 @@
 
       let(:expected_result) do
         databanks = DataBank.pluck(:id, :name).to_h
-        list = databanks.map { |id, name| I18n.t('.databank.list_line_html', id: id, name: name) }.join("\n")
+        list = databanks.map { |id, name| I18n.t('.databank.list_line_html', id:, name:) }.join("\n")
         active = chat.data_bank_ids.present? ? chat.data_bank_ids.to_sentence : I18n.t('false')
-        I18n.t('.databank.list_html', list: list, active: active)
+        I18n.t('.databank.list_html', list:, active:)
       end
 
       before { databanks }
@@ -90,7 +90,7 @@
       end
     end
 
-    context 'witout databank id' do
+    context 'without databank id' do
       let(:message) { build :tg_message, :command_databank_enable, message_params }
       let(:chat) { create :chat, :disabled_random, data_bank_ids: databanks.map(&:id) }
 
@@ -154,7 +154,7 @@
       end
     end
 
-    context 'witout databank id' do
+    context 'without databank id' do
       let(:message) { build :tg_message, :command_databank_disable, message_params }
 
       it 'resets data_bank_ids attribute' do
diff --git a/spec/processors/message_processor/eightball_spec.rb b/spec/processors/message_processor/eightball_spec.rb
index a93ef8f..a5a5c34 100644
--- a/spec/processors/message_processor/eightball_spec.rb
+++ b/spec/processors/message_processor/eightball_spec.rb
@@ -20,11 +20,13 @@
   let(:off_command) { build :tg_message, :command_empty_eightball, message_params.merge!(text: '/eightball off') }
   let(:enable_command) do
     build :tg_message, :command_empty_eightball,
-                       message_params.merge!(chat: { id: disabled_chat.telegram_id }, text: '/eightball enable')
+          message_params.merge!(chat: { id: disabled_chat.telegram_id },
+                                text: '/eightball enable')
   end
   let(:on_command) do
     build :tg_message, :command_empty_eightball,
-                       message_params.merge!(chat: { id: disabled_chat.telegram_id }, text: '/eightball on')
+          message_params.merge!(chat: { id: disabled_chat.telegram_id },
+                                text: '/eightball on')
   end
 
   it 'has message model trait' do
diff --git a/spec/processors/message_processor/me_spec.rb b/spec/processors/message_processor/me_spec.rb
index 4f0d581..07ed7af 100644
--- a/spec/processors/message_processor/me_spec.rb
+++ b/spec/processors/message_processor/me_spec.rb
@@ -43,7 +43,7 @@
     subject(:result) { described_class.new(empty_me).process }
 
     it 'replies with predefined answers' do
-      replies = I18n.t('.me').map { |r| "<a href='tg://user?id=#{user.id}'>#{user.username}</a> #{r}"}
+      replies = I18n.t('.me').map { |r| "<a href='tg://user?id=#{user.id}'>#{user.username}</a> #{r}" }
       expect(replies).to include result[:send_message][:text]
     end
   end
diff --git a/spec/processors/message_processor/start_spec.rb b/spec/processors/message_processor/start_spec.rb
index 94722e9..172566b 100644
--- a/spec/processors/message_processor/start_spec.rb
+++ b/spec/processors/message_processor/start_spec.rb
@@ -26,10 +26,6 @@
       expect(described_class.new(ping).responds?).to eq false
     end
 
-    it 'non /start command' do
-      expect(described_class.new(ping).responds?).to eq false
-    end
-
     it 'empty text' do
       expect(described_class.new(picture).responds?).to eq false
     end
diff --git a/spec/processors/message_processor/status_spec.rb b/spec/processors/message_processor/status_spec.rb
index 60e2a12..2d39828 100644
--- a/spec/processors/message_processor/status_spec.rb
+++ b/spec/processors/message_processor/status_spec.rb
@@ -56,7 +56,6 @@
                                    gab: chat.random,
                                    pairs: chat.pairs.size,
                                    databanks: I18n.t(chat.data_bank_ids.present?.to_s),
-                                   cas_banner: I18n.t(chat.casbanhammer?.to_s),
                                    winner: chat.winner || t('.winner.disabled'))
 
       expect(response).to eq result[:send_message][:text]
diff --git a/spec/processors/message_processor/stop_spec.rb b/spec/processors/message_processor/stop_spec.rb
index 240ee78..d54f1fa 100644
--- a/spec/processors/message_processor/stop_spec.rb
+++ b/spec/processors/message_processor/stop_spec.rb
@@ -26,10 +26,6 @@
       expect(described_class.new(ping).responds?).to eq false
     end
 
-    it 'non /stop command' do
-      expect(described_class.new(ping).responds?).to eq false
-    end
-
     it 'empty text' do
       expect(described_class.new(picture).responds?).to eq false
     end
@@ -42,7 +38,7 @@
   it "doesn't disable chat by regular user" do
     expect do
       described_class.new(user_stop).process
-       chat.reload
+      chat.reload
     end.not_to change(chat.reload, :active_at)
   end
 
diff --git a/spec/processors/message_processor/winner_spec.rb b/spec/processors/message_processor/winner_spec.rb
index 2a51303..b6d1d3a 100644
--- a/spec/processors/message_processor/winner_spec.rb
+++ b/spec/processors/message_processor/winner_spec.rb
@@ -10,7 +10,7 @@
   let(:message_params) { { chat: { id: chat.telegram_id }, from: { id: user.id } } }
   let(:message)        { build :tg_message, message_params }
   let(:chat)           { create :chat, :disabled_random }
-  let(:participation)  { create :participation, user: user, chat: chat }
+  let(:participation)  { create :participation, user:, chat: }
 
   before { participation }
 
@@ -50,7 +50,7 @@
     describe 'responds with send_message' do
       subject(:send_message) { process_method[:send_message] }
 
-      let(:winners) { create_list :winner, 15, chat: chat }
+      let(:winners) { create_list :winner, 15, chat: }
 
       it 'chat_id' do
         expect(send_message[:chat_id]).to eq chat.telegram_id
@@ -80,7 +80,7 @@
                     .map { |(user, wins), idx| I18n.t('winner.top_line_html', position: idx + 1, user: user.to_s, score: wins) }
                     .join("\n")
           name = chat.winners.order(created_at: :desc).first.user.to_s
-          I18n.t('winner.winner_html', top: top, name: chat.winner, user: name)
+          I18n.t('winner.winner_html', top:, name: chat.winner, user: name)
         end
 
         before { winners }
@@ -98,7 +98,7 @@
     describe 'responds with send_message' do
       subject(:send_message) { process_method[:send_message] }
 
-      let(:participations) { create_list :participation, 15, chat: chat }
+      let(:participations) { create_list :participation, 15, chat: }
 
       it 'chat_id' do
         expect(send_message[:chat_id]).to eq chat.telegram_id
@@ -122,7 +122,7 @@
                   .map do |p, i|
                     I18n.t('winner.top_line_html', position: i + 1, user: p.user.to_s, score: p.score) if p.user.present?
                   end.compact.join("\n")
-        expected_result = I18n.t('winner.current_html', top: top)
+        expected_result = I18n.t('winner.current_html', top:)
 
         expect(send_message[:text]).to eq expected_result
       end
diff --git a/spec/processors/message_processor_spec.rb b/spec/processors/message_processor_spec.rb
index 747a7d2..a21d93d 100644
--- a/spec/processors/message_processor_spec.rb
+++ b/spec/processors/message_processor_spec.rb
@@ -8,11 +8,9 @@
   let(:message) { FactoryBot.build :tg_message }
 
   let(:available_processors) do
-    %w[CasBanner
-       Me
+    %w[Me
        Say
        BinaryDice
-       CovidStats
        CoolStory
        Databank
        Eightball
diff --git a/spec/services/cas_service_spec.rb b/spec/services/cas_service_spec.rb
deleted file mode 100644
index d11cec5..0000000
--- a/spec/services/cas_service_spec.rb
+++ /dev/null
@@ -1,34 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe CasService do
-  subject(:call_method) { described_class.banned?(user.id) }
-
-  let(:stub) { webmocks(:cas, :check, telegram_id: user.id, banned: user.casbanned?) }
-
-  before { stub }
-
-  shared_examples 'status checker' do
-    it do
-      expect(call_method).to eq user.casbanned?
-    end
-
-    it 'makes request' do
-      call_method
-      expect(stub[:mock]).to have_been_requested
-    end
-  end
-
-  describe 'banned' do
-    let(:user) { create :user, :casbanned }
-
-    it_behaves_like 'status checker'
-  end
-
-  describe 'not banned' do
-    let(:user) { create :user }
-
-    it_behaves_like 'status checker'
-  end
-end
diff --git a/spec/services/stop_covid_service_spec.rb b/spec/services/stop_covid_service_spec.rb
deleted file mode 100644
index 127422a..0000000
--- a/spec/services/stop_covid_service_spec.rb
+++ /dev/null
@@ -1,22 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe StopCovidService do
-  subject(:call) { described_class.get_data(region_id) }
-
-  let(:region_id) { CovidStat::FETCHABLE_REGIONS.sample }
-  let(:stub)      { webmocks(:stop_covid, :get_region_stats, region_id: region_id) }
-
-  before { stub }
-
-  it 'makes request' do
-    call
-    expect(stub[:mock]).to have_been_requested
-  end
-
-  it 'converts dates from json' do
-    result = stub[:body].map { |r| r.except(:date).merge(date: Date.parse(r[:date])) }
-    expect(call).to eq result
-  end
-end
diff --git a/spec/support/web_mocks/cas.rb b/spec/support/web_mocks/cas.rb
deleted file mode 100644
index 255d5d7..0000000
--- a/spec/support/web_mocks/cas.rb
+++ /dev/null
@@ -1,28 +0,0 @@
-# frozen_string_literal: true
-
-module WebMocks
-  module Cas
-    class << self
-      def check(args = {})
-        args.reverse_merge!(telegram_id: rand(999), banned: false)
-
-        body = if args[:banned]
-                 { ok: true, result: { offenses: 1, messages: ['test'], time_added: '2022-05-01T10:50:19.000Z' } }
-               else
-                 { ok: false, description: 'Record not found.' }
-               end
-
-        mock = ::WebMock.stub_request(:get, endpoint(args[:telegram_id]))
-                        .to_return(status: 200, body: body.to_json)
-
-        { mock:, body:, args: }
-      end
-
-      private
-
-      def endpoint(telegram_id)
-        "#{Rails.configuration.secrets[:cas_url]}/check?user_id=#{telegram_id}"
-      end
-    end
-  end
-end
diff --git a/spec/support/web_mocks/stop_covid.rb b/spec/support/web_mocks/stop_covid.rb
deleted file mode 100644
index e9580c5..0000000
--- a/spec/support/web_mocks/stop_covid.rb
+++ /dev/null
@@ -1,29 +0,0 @@
-# frozen_string_literal: true
-
-module WebMocks
-  module StopCovid
-    class << self
-      def get_region_stats(args = {})
-        args.reverse_merge!(region_id: CovidStat::FETCHABLE_REGIONS.sample)
-
-        body = (30.days.ago.to_date..1.day.ago.to_date).map { |date| stat(date) }
-        mock = ::WebMock.stub_request(:get, endpoint(args[:region_id]))
-                        .to_return(status: 200, body: body.to_json)
-
-        { mock: mock, body: body, args: args }
-      end
-
-      private
-
-      def stat(date)
-        model_data = FactoryBot.attributes_for(:covid_stat, date: date).except(:region)
-        model_data[:date] = model_data[:date].strftime('%d.%m.%Y')
-        model_data
-      end
-
-      def endpoint(region_id)
-        "#{Rails.configuration.secrets[:stop_covid_url]}/covid_data.json?do=region_stats&code=RU-#{region_id.upcase}"
-      end
-    end
-  end
-end
diff --git a/spec/support/web_mocks/telegram.rb b/spec/support/web_mocks/telegram.rb
index a7c339d..4d2e8c7 100644
--- a/spec/support/web_mocks/telegram.rb
+++ b/spec/support/web_mocks/telegram.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module WebMocks
   module Telegram
     class << self
diff --git a/spec/workers/covid_region_updater_worker_spec.rb b/spec/workers/covid_region_updater_worker_spec.rb
deleted file mode 100644
index 78eca30..0000000
--- a/spec/workers/covid_region_updater_worker_spec.rb
+++ /dev/null
@@ -1,18 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe CovidRegionUpdaterWorker, type: :worker do
-  let(:region_id) { CovidStat::FETCHABLE_REGIONS.sample }
-
-  it 'enqueues a worker' do
-    expect { described_class.perform_async(region_id) }
-      .to change(described_class.jobs, :size).by(1)
-  end
-
-  it 'sends update to UpdateProcessor' do
-    allow(CovidStat).to receive(:update).with(region_id)
-    described_class.new.perform(region_id)
-    expect(CovidStat).to have_received(:update)
-  end
-end
diff --git a/spec/workers/covid_sender_worker_spec.rb b/spec/workers/covid_sender_worker_spec.rb
deleted file mode 100644
index dc01662..0000000
--- a/spec/workers/covid_sender_worker_spec.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe CovidSenderWorker, type: :worker do
-  let(:region) { CovidStat::FETCHABLE_REGIONS.sample }
-  let(:chat)   { create :chat, covid_region: region, covid_last_notification: Time.zone.yesterday }
-  let(:stats) do
-    [create(:covid_stat, region: region, date: Time.zone.yesterday),
-     create(:covid_stat, region: region, date: Time.zone.today)]
-  end
-
-  it 'enqueues a worker' do
-    expect { described_class.perform_async }.to change(described_class.jobs, :size).by(1)
-  end
-
-  it 'sends results' do
-    chat
-    stats
-    allow(SendPayloadWorker).to receive(:perform_async)
-    described_class.new.perform
-    expect(SendPayloadWorker).to have_received(:perform_async).once
-  end
-end
diff --git a/spec/workers/covid_updater_worker_spec.rb b/spec/workers/covid_updater_worker_spec.rb
deleted file mode 100644
index ee0e399..0000000
--- a/spec/workers/covid_updater_worker_spec.rb
+++ /dev/null
@@ -1,37 +0,0 @@
-# frozen_string_literal: true
-
-require 'rails_helper'
-
-RSpec.describe CovidUpdaterWorker, type: :worker do
-  let(:region_id) { CovidStat::FETCHABLE_REGIONS.sample }
-  let(:stub)      { webmocks(:stop_covid, :get_region_stats, region_id: region_id) }
-
-  before do
-    stub
-    stub_const('CovidStat::FETCHABLE_REGIONS', [region_id])
-  end
-
-  it 'enqueues a worker' do
-    expect { described_class.perform_async(region_id) }
-      .to change(described_class.jobs, :size).by(1)
-  end
-
-  it 'checks if update available' do
-    allow(CovidStat).to receive(:needs_update?)
-    described_class.new.perform
-    expect(CovidStat).to have_received(:needs_update?)
-  end
-
-  it 'starts update' do
-    allow(CovidStat).to receive(:update_all)
-    described_class.new.perform
-    expect(CovidStat).to have_received(:update_all)
-  end
-
-  it "doesn't start update" do
-    allow(CovidStat).to receive(:needs_update?).and_return(false)
-    allow(CovidStat).to receive(:update_all)
-    described_class.new.perform
-    expect(CovidStat).not_to have_received(:update_all)
-  end
-end
diff --git a/spec/workers/idle_check_worker_spec.rb b/spec/workers/idle_check_worker_spec.rb
index e1691a7..ac30271 100644
--- a/spec/workers/idle_check_worker_spec.rb
+++ b/spec/workers/idle_check_worker_spec.rb
@@ -5,7 +5,7 @@
 RSpec.describe IdleCheckWorker, type: :worker do
   let(:chat)           { create :chat, active_at: Time.current }
   let(:inactive_chat)  { create :chat, active_at: 20.days.ago }
-  let(:participations) { create :participation, chat: chat }
+  let(:participations) { create :participation, chat: }
 
   it 'enqueues a worker' do
     expect { described_class.perform_async }
diff --git a/spec/workers/winner_gamble_worker_spec.rb b/spec/workers/winner_gamble_worker_spec.rb
index ed5c035..5ee9af2 100644
--- a/spec/workers/winner_gamble_worker_spec.rb
+++ b/spec/workers/winner_gamble_worker_spec.rb
@@ -4,7 +4,7 @@
 
 RSpec.describe WinnerGambleWorker, type: :worker do
   let(:chat)           { create :chat }
-  let(:participations) { create :participation, chat: chat }
+  let(:participations) { create :participation, chat: }
 
   it 'enqueues a worker' do
     expect { described_class.perform_async }