Add v2 approval rule table and model

Adds new approval rule table and model
for new approval rule architecture.

Changelog: changed
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179839
EE: true

db/docs/merge_requests_approval_rules_groups.yml

+---
+table_name: merge_requests_approval_rules_groups
+classes:
+  - MergeRequests::ApprovalRulesGroup
+feature_categories:
+  - code_review_workflow
+description: Stores relationship between approval rules v2 and groups
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179861
+milestone: '17.9'
+gitlab_schema: gitlab_main_cell
+sharding_key:
+  group_id: namespaces

db/docs/merge_requests_approval_rules_merge_requests.yml

+---
+table_name: merge_requests_approval_rules_merge_requests
+classes:
+  - MergeRequests::ApprovalRulesMergeRequest
+feature_categories:
+  - code_review_workflow
+description: Stores relationship between approval rules v2 and merge requests
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179861
+milestone: '17.9'
+gitlab_schema: gitlab_main_cell
+sharding_key:
+  project_id: projects

db/docs/merge_requests_approval_rules_projects.yml

+---
+table_name: merge_requests_approval_rules_projects
+classes:
+  - MergeRequests::ApprovalRulesProject
+feature_categories:
+  - code_review_workflow
+description: Stores relationship between approval rules v2 and projects
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/179861
+milestone: '17.9'
+gitlab_schema: gitlab_main_cell
+sharding_key:
+  project_id: projects

db/migrate/20250123151708_create_merge_requests_approval_rules_groups.rb

+# frozen_string_literal: true
+
+class CreateMergeRequestsApprovalRulesGroups < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+
+  def change
+    create_table :merge_requests_approval_rules_groups do |t| # -- Migration/EnsureFactoryForTable false positive
+      t.bigint :approval_rule_id, null: false
+      t.bigint :group_id, null: false
+      t.index :group_id
+      t.timestamps_with_timezone null: false
+    end
+
+    add_index(
+      :merge_requests_approval_rules_groups,
+      %i[approval_rule_id group_id],
+      unique: true,
+      name: 'index_mrs_ars_groups_on_ar_id_and_group_id'
+    )
+  end
+end

db/migrate/20250123151726_create_merge_requests_approval_rules_merge_requests.rb

+# frozen_string_literal: true
+
+class CreateMergeRequestsApprovalRulesMergeRequests < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+
+  def change
+    create_table :merge_requests_approval_rules_merge_requests do |t| # Migration/EnsureFactoryForTable false positive
+      t.bigint :approval_rule_id, null: false
+      t.bigint :merge_request_id, null: false
+      t.bigint :project_id, null: false
+      t.index :merge_request_id, name: 'index_mrs_approval_rules_mrs_on_mr_id'
+      t.index :project_id, name: 'index_mrs_approval_rules_mrs_on_project_id'
+      t.timestamps_with_timezone null: false
+    end
+
+    add_index(
+      :merge_requests_approval_rules_merge_requests,
+      %i[approval_rule_id merge_request_id],
+      unique: true,
+      name: 'index_mrs_ars_mrs_on_ar_id_and_mr_id'
+    )
+  end
+end

db/migrate/20250123151745_create_merge_requests_approval_rules_projects.rb

+# frozen_string_literal: true
+
+class CreateMergeRequestsApprovalRulesProjects < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+
+  def change
+    create_table :merge_requests_approval_rules_projects do |t| # -- Migration/EnsureFactoryForTable false positive
+      t.bigint :approval_rule_id, null: false
+      t.bigint :project_id, null: false
+      t.index :project_id, name: 'index_mrs_approval_rules_projects_on_project_id'
+      t.timestamps_with_timezone null: false
+    end
+
+    add_index(
+      :merge_requests_approval_rules_projects,
+      %i[approval_rule_id project_id],
+      unique: true,
+      name: 'index_mrs_ars_projects_on_ar_id_and_project_id'
+    )
+  end
+end

db/migrate/20250206143903_add_merge_requests_approval_rules_groups_approval_rule_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesGroupsApprovalRuleFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_groups, :merge_requests_approval_rules,
+      column: :approval_rule_id, on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_groups, column: :approval_rule_id
+    end
+  end
+end

db/migrate/20250206143924_add_merge_requests_approval_rules_groups_group_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesGroupsGroupFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_groups, :namespaces, column: :group_id,
+      on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_groups, column: :group_id
+    end
+  end
+end

db/migrate/20250206144004_add_merge_requests_approval_rules_projects_approval_rule_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesProjectsApprovalRuleFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_projects, :merge_requests_approval_rules,
+      column: :approval_rule_id, on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_projects, column: :approval_rule_id
+    end
+  end
+end

db/migrate/20250206144027_add_merge_requests_approval_rules_projects_project_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesProjectsProjectFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_projects, :projects, column: :project_id,
+      on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_projects, column: :project_id
+    end
+  end
+end

db/migrate/20250206144049_add_merge_requests_approval_rules_mrs_approval_rule_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesMrsApprovalRuleFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_merge_requests, :merge_requests_approval_rules,
+      column: :approval_rule_id, on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_merge_requests, column: :approval_rule_id
+    end
+  end
+end

db/migrate/20250206144110_add_merge_requests_approval_rules_mrs_mr_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesMrsMrFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_merge_requests, :merge_requests,
+      column: :merge_request_id,
+      on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_merge_requests, column: :merge_request_id
+    end
+  end
+end

db/migrate/20250211141110_add_merge_requests_approval_rules_mrs_project_fk.rb

+# frozen_string_literal: true
+
+class AddMergeRequestsApprovalRulesMrsProjectFk < Gitlab::Database::Migration[2.2]
+  milestone '17.9'
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :merge_requests_approval_rules_merge_requests, :projects,
+      column: :project_id,
+      on_delete: :cascade
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key :merge_requests_approval_rules_merge_requests, column: :project_id
+    end
+  end
+end

db/schema_migrations/20250123151708

+620def37e032e7fa463c4f1ecff0aacde33a5b9bd7a56c2f6ead418b3f4ce828
\ No newline at end of file

db/schema_migrations/20250123151726

+e5a26f1a31603cf3ac570824874afbeac3bb970ca079bdaaebbf9cbe13155230
\ No newline at end of file

db/schema_migrations/20250123151745

+d6fc925f97583a4509894202b2e529ae64138f2cceef76e0d0c4dcaafe70f45a
\ No newline at end of file

db/schema_migrations/20250206143903

+56101662487483f6866c2c1f2cd0ee66d1fa12d08c0da12bd550d389e37f6bf7
\ No newline at end of file

db/schema_migrations/20250206143924

+4b740e775e43ed2143b7060b5e5e1730aeb7309cc83e4d76a5316cc84e80893b
\ No newline at end of file

db/schema_migrations/20250206144004

+31f9cc1659cd680b16a742eddeb361c4eb059388b1af0136d0d5a648a6fb8cca
\ No newline at end of file

db/schema_migrations/20250206144027

+08d74afd22511618546821c8cc53473ec3a9f6ec4be3c80a20086e1a2e71da37
\ No newline at end of file