diff --git a/.hound.yml b/.hound.yml
index 6540cc8..cdf1016 100644
--- a/.hound.yml
+++ b/.hound.yml
@@ -1 +1,4 @@
 fail_on_violations: true
+
+ruby:
+  config_file: .rubocop.yml
diff --git a/.rubocop.yml b/.rubocop.yml
index 5d48bb2..271ade4 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -30,3 +30,16 @@ Metrics/AbcSize:
   Exclude:
     - "db/migrate/*"
   Max: 20
+
+Metrics/BlockLength:
+  ExcludedMethods:
+    - "namespace"
+    - "create_table"
+  Exclude:
+    - "config/**/*.rb"
+    - "spec/**/*.rb"
+
+# Disable documentation checks for now
+# should be done with yard instead
+Style/Documentation:
+  Enabled: false
diff --git a/app/models/group.rb b/app/models/group.rb
index 3738e97..39cba55 100644
--- a/app/models/group.rb
+++ b/app/models/group.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 class Group < ApplicationRecord
-  belongs_to :matches
-  belongs_to :teams
+  belongs_to :stage
+  has_many :matches, dependent: :destroy
+  has_many :group_scores, dependent: :destroy
 end
diff --git a/app/models/group_score.rb b/app/models/group_score.rb
new file mode 100644
index 0000000..d7686d3
--- /dev/null
+++ b/app/models/group_score.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class GroupScore < ApplicationRecord
+  belongs_to :team
+  belongs_to :group
+end
diff --git a/app/models/group_stage.rb b/app/models/group_stage.rb
deleted file mode 100644
index aac2290..0000000
--- a/app/models/group_stage.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class GroupStage < ApplicationRecord
-end
diff --git a/app/models/match.rb b/app/models/match.rb
index 5d8cb6e..54c1f66 100644
--- a/app/models/match.rb
+++ b/app/models/match.rb
@@ -1,4 +1,9 @@
 # frozen_string_literal: true
 
 class Match < ApplicationRecord
+  belongs_to :stage
+  belongs_to :group
+  has_many :scores, dependent: :destroy
+
+  validates :scores, length: { maximum: 2 }
 end
diff --git a/app/models/playoff_stage.rb b/app/models/playoff_stage.rb
deleted file mode 100644
index 682ef29..0000000
--- a/app/models/playoff_stage.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-# frozen_string_literal: true
-
-class PlayoffStage < ApplicationRecord
-end
diff --git a/app/models/score.rb b/app/models/score.rb
new file mode 100644
index 0000000..c24c0a9
--- /dev/null
+++ b/app/models/score.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class Score < ApplicationRecord
+  belongs_to :match
+  belongs_to :team
+end
diff --git a/app/models/stage.rb b/app/models/stage.rb
new file mode 100644
index 0000000..b43d80c
--- /dev/null
+++ b/app/models/stage.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class Stage < ApplicationRecord
+  belongs_to :tournament
+  has_many :matches, dependent: :destroy
+  has_many :groups, dependent: :destroy
+end
diff --git a/app/models/team.rb b/app/models/team.rb
index ab022b6..023b9db 100644
--- a/app/models/team.rb
+++ b/app/models/team.rb
@@ -1,4 +1,9 @@
 # frozen_string_literal: true
 
 class Team < ApplicationRecord
+  belongs_to :tournament
+  has_many :group_scores, dependent: :destroy
+  has_many :scores, dependent: :destroy
+
+  validates :name, presence: true
 end
diff --git a/app/models/tournament.rb b/app/models/tournament.rb
index 46e28f4..68b8495 100644
--- a/app/models/tournament.rb
+++ b/app/models/tournament.rb
@@ -1,4 +1,18 @@
 # frozen_string_literal: true
 
+require 'securerandom'
+
 class Tournament < ApplicationRecord
+  belongs_to :user
+  has_many :teams, dependent: :destroy
+  has_many :stages, dependent: :destroy
+
+  validates :name, presence: true
+  validates :code, presence: true, uniqueness: true
+
+  alias_attribute :owner, :user
+
+  after_initialize do |tournament|
+    tournament.code ||= SecureRandom.hex 3
+  end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index ef5c4d4..b24614f 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -7,4 +7,6 @@ class User < ApplicationRecord
   include DeviseTokenAuth::Concerns::User
 
   validates :username, presence: true, uniqueness: true
+
+  has_many :tournaments, dependent: :destroy
 end
diff --git a/db/migrate/0000_create_schema.rb b/db/migrate/0000_create_schema.rb
index 0b6323c..8860203 100644
--- a/db/migrate/0000_create_schema.rb
+++ b/db/migrate/0000_create_schema.rb
@@ -2,62 +2,16 @@
 
 class CreateSchema < ActiveRecord::Migration[5.2]
   def change
-    create_table :groups do |t|
-      t.string :name
-
-      t.timestamps
-    end
-
-    create_table :group_stages do |t|
-      t.integer :playoff_size
-
-      t.timestamps
-    end
-
-    create_table :matches do |t|
-      t.integer :score_team_1
-      t.integer :score_team_2
-      t.integer :state
-      t.integer :position
-      t.boolean :is_group_match
-
-      t.timestamps
-    end
-
-    create_table :playoff_stages do |t|
-      t.integer :level
-
-      t.timestamps
-    end
-
-    create_table :teams do |t|
-      t.string :name
-      t.integer :group_score
-      t.integer :group_points_scored
-      t.integer :group_points_recieved
-
-      t.timestamps
-    end
-
-    create_table :tournaments do |t|
-      t.string :name
-      t.string :code
-      t.string :description
-      t.boolean :public, default: true
-
-      t.timestamps
-    end
-
     create_table :users do |t|
       ## Required
-      t.string :provider, null: false, default: 'email'
-      t.string :uid, null: false, default: ''
+      t.string :provider, null: false, default: 'email', index: true
+      t.string :uid, null: false, default: '', index: { unique: true }
 
       ## Database authenticatable
       t.string :encrypted_password, null: false, default: ''
 
       ## Recoverable
-      t.string   :reset_password_token
+      t.string   :reset_password_token, index: { unique: true }
       t.datetime :reset_password_sent_at
       t.boolean  :allow_password_change, default: false
 
@@ -72,7 +26,7 @@ class CreateSchema < ActiveRecord::Migration[5.2]
       t.string   :last_sign_in_ip
 
       ## Confirmable
-      t.string   :confirmation_token
+      t.string   :confirmation_token, index: { unique: true }
       t.datetime :confirmed_at
       t.datetime :confirmation_sent_at
       t.string   :unconfirmed_email # Only if using reconfirmable
@@ -83,8 +37,8 @@ class CreateSchema < ActiveRecord::Migration[5.2]
       # t.datetime :locked_at
 
       ## User Info
-      t.string :username
-      t.string :email
+      t.string :username, index: { unique: true }
+      t.string :email, index: { unique: true }
 
       ## Tokens
       t.text :tokens
@@ -92,11 +46,69 @@ class CreateSchema < ActiveRecord::Migration[5.2]
       t.timestamps
     end
 
-    add_index :users, :username, unique: true
-    add_index :users, :email, unique: true
-    add_index :users, %i[uid provider], unique: true
-    add_index :users, :reset_password_token, unique: true
-    add_index :users, :confirmation_token,   unique: true
-    # add_index :users, :unlock_token,       unique: true
+    create_table :tournaments do |t|
+      t.string :name, null: false
+      t.string :code, null: false, index: { unique: true }
+      t.string :description
+      t.boolean :public, default: true
+
+      # relation to owner
+      t.belongs_to :user, index: true, null: false, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    create_table :stages do |t|
+      t.integer :level
+
+      t.belongs_to :tournament, index: true, foreign_key: { on_delete: :cascade }, null: false
+
+      t.timestamps
+    end
+
+    create_table :groups do |t|
+      t.integer :number
+
+      t.belongs_to :stage, index: true, foreign_key: { on_delete: :cascade }, null: false
+
+      t.timestamps
+    end
+
+    create_table :matches do |t|
+      t.integer :state, default: 0
+
+      t.belongs_to :stage, index: true, foreign_key: { on_delete: :cascade }
+      t.belongs_to :group, index: true, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    create_table :teams do |t|
+      t.string :name
+
+      t.belongs_to :tournament, index: true, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    create_table :scores do |t|
+      t.integer :score, default: 0
+
+      t.belongs_to :match, index: true, null: false, foreign_key: { on_delete: :cascade }
+      t.belongs_to :team, index: true, null: false, foreign_key: { on_delete: :cascade }
+
+      t.timestamps
+    end
+
+    create_table :group_scores do |t|
+      t.integer :score, default: 0
+      t.integer :points_scored, default: 0
+      t.integer :points_received, default: 0
+
+      t.belongs_to :team, index: true, foreign_key: { on_delete: :cascade }, null: false
+      t.belongs_to :group, index: true, foreign_key: { on_delete: :cascade }, null: false
+
+      t.timestamps
+    end
   end
 end
diff --git a/spec/factories/group_scores.rb b/spec/factories/group_scores.rb
new file mode 100644
index 0000000..558484a
--- /dev/null
+++ b/spec/factories/group_scores.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :group_score do
+    team
+    group
+  end
+end
diff --git a/spec/factories/groups.rb b/spec/factories/groups.rb
new file mode 100644
index 0000000..841f741
--- /dev/null
+++ b/spec/factories/groups.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :group do
+    number { 0 }
+    stage
+  end
+end
diff --git a/spec/factories/matches.rb b/spec/factories/matches.rb
new file mode 100644
index 0000000..55e26c3
--- /dev/null
+++ b/spec/factories/matches.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :match do
+    stage
+    group
+  end
+end
diff --git a/spec/factories/scores.rb b/spec/factories/scores.rb
new file mode 100644
index 0000000..dd1977a
--- /dev/null
+++ b/spec/factories/scores.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :score do
+    score { 0 }
+    match
+    team
+  end
+end
diff --git a/spec/factories/stages.rb b/spec/factories/stages.rb
new file mode 100644
index 0000000..4353af1
--- /dev/null
+++ b/spec/factories/stages.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :stage do
+    tournament
+  end
+end
diff --git a/spec/factories/teams.rb b/spec/factories/teams.rb
new file mode 100644
index 0000000..9836e0f
--- /dev/null
+++ b/spec/factories/teams.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :team do
+    name { Faker::Dog.name }
+    tournament
+  end
+end
diff --git a/spec/factories/tournaments.rb b/spec/factories/tournaments.rb
new file mode 100644
index 0000000..36ae8bc
--- /dev/null
+++ b/spec/factories/tournaments.rb
@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :tournament do
+    name { Faker::Dog.name }
+    description { Faker::Lorem.sentence }
+    user
+  end
+end
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
new file mode 100644
index 0000000..cb6d278
--- /dev/null
+++ b/spec/factories/users.rb
@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :user do
+    username { Faker::Internet.username }
+    email { Faker::Internet.email }
+  end
+end
diff --git a/spec/models/group_score_spec.rb b/spec/models/group_score_spec.rb
new file mode 100644
index 0000000..8056e32
--- /dev/null
+++ b/spec/models/group_score_spec.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe GroupScore, type: :model do
+  describe 'association' do
+    it { should belong_to :team }
+    it { should belong_to :group }
+  end
+
+  it 'has a valid factory' do
+    expect(build(:group_score)).to be_valid
+  end
+end
diff --git a/spec/models/group_spec.rb b/spec/models/group_spec.rb
new file mode 100644
index 0000000..0f5784a
--- /dev/null
+++ b/spec/models/group_spec.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Group, type: :model do
+  describe 'association' do
+    it { should belong_to :stage }
+    it { should have_many :matches }
+    it { should have_many :group_scores }
+  end
+
+  it 'has a valid factory' do
+    expect(build(:group)).to be_valid
+  end
+end
diff --git a/spec/models/match_spec.rb b/spec/models/match_spec.rb
new file mode 100644
index 0000000..1162808
--- /dev/null
+++ b/spec/models/match_spec.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Match, type: :model do
+  context 'association' do
+    it { should have_many :scores }
+    it { should belong_to :stage }
+    it { should belong_to :group }
+  end
+
+  context 'scores' do
+    before do
+      @match = create(:match)
+      @match.scores << build_pair(:score)
+    end
+
+    it 'can only have two scores' do
+      @match.scores << build(:score)
+      expect(@match).to be_invalid
+    end
+
+    it 'can access its scores' do
+      @match.scores[0].score = 0
+      @match.scores[1].score = 0
+    end
+  end
+
+  it 'has a valid factory' do
+    expect(build(:match)).to be_valid
+  end
+end
diff --git a/spec/models/score_spec.rb b/spec/models/score_spec.rb
new file mode 100644
index 0000000..4d68364
--- /dev/null
+++ b/spec/models/score_spec.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Score, type: :model do
+  describe 'association' do
+    it { should belong_to :match }
+    it { should belong_to :team }
+  end
+
+  it 'has a valid factory' do
+    expect(build(:score)).to be_valid
+  end
+end
diff --git a/spec/models/stage_spec.rb b/spec/models/stage_spec.rb
new file mode 100644
index 0000000..4af3c30
--- /dev/null
+++ b/spec/models/stage_spec.rb
@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Stage, type: :model do
+  describe 'association' do
+    it { should belong_to :tournament }
+    it { should have_many :matches }
+    it { should have_many :groups }
+  end
+
+  it 'has a valid factory' do
+    expect(build(:stage)).to be_valid
+  end
+end
diff --git a/spec/models/team_spec.rb b/spec/models/team_spec.rb
new file mode 100644
index 0000000..23b38bf
--- /dev/null
+++ b/spec/models/team_spec.rb
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Team, type: :model do
+  describe 'validation' do
+    it { should validate_presence_of :name }
+  end
+
+  describe 'association' do
+    it { should belong_to :tournament }
+    it { should have_many :group_scores }
+    it { should have_many :scores }
+  end
+
+  it 'has a valid factory' do
+    expect(build(:team)).to be_valid
+  end
+end
diff --git a/spec/models/tournament_spec.rb b/spec/models/tournament_spec.rb
new file mode 100644
index 0000000..5182e11
--- /dev/null
+++ b/spec/models/tournament_spec.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe Tournament, type: :model do
+  before do
+    @tournament = create(:tournament)
+  end
+
+  describe 'validation' do
+    it { should validate_presence_of :name }
+    it { should validate_presence_of :code }
+    it { should validate_uniqueness_of :code }
+    it { should_not validate_presence_of :description }
+    it { should_not validate_presence_of :public }
+  end
+
+  describe 'initialization' do
+    it 'should have a code' do
+      expect(@tournament.code.length).to be(6)
+    end
+    it 'should be public' do
+      expect(@tournament.public).to be(true)
+    end
+  end
+
+  describe 'association' do
+    it { should belong_to :user }
+    it { should have_many :teams }
+    it { should have_many :stages }
+  end
+
+  it 'has valid factory' do
+    expect(build(:tournament)).to be_valid
+  end
+end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
new file mode 100644
index 0000000..c4ab25f
--- /dev/null
+++ b/spec/models/user_spec.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe User, type: :model do
+  describe 'association' do
+    it { should have_many :tournaments }
+  end
+
+  it 'has a valid factory' do
+    expect(build(:user)).to be_valid
+  end
+end