Remove unique index and add composite key index to SO

Add changelog

changelogs/unreleased/remove-index-add-index.yml

+---
+title: Remove unique index and add composite key index to Security Orchestration
+merge_request: 55521
+author:
+type: other

db/migrate/20210302155904_remove_index_for_security_orchestration_policy.rb

+# frozen_string_literal: true
+
+class RemoveIndexForSecurityOrchestrationPolicy < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_sop_configs_on_security_policy_management_project_id'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name(:security_orchestration_policy_configurations, INDEX_NAME)
+  end
+
+  def down
+    add_concurrent_index(:security_orchestration_policy_configurations, :security_policy_management_project_id, name: INDEX_NAME)
+  end
+end

db/migrate/20210302160544_add_index_to_security_orchestration_policy.rb

+# frozen_string_literal: true
+
+class AddIndexToSecurityOrchestrationPolicy < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX = 'index_sop_configurations_project_id_policy_project_id'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :security_orchestration_policy_configurations, [:security_policy_management_project_id, :project_id], name: INDEX
+  end
+
+  def down
+    remove_concurrent_index_by_name :security_orchestration_policy_configurations, INDEX
+  end
+end

db/schema_migrations/20210302155904

+104e767518d55a7caa5ff517efe978287beb629649c681a2871ada8a677a0e13
\ No newline at end of file

db/schema_migrations/20210302160544

+e5c589decb2bc8d3e37451bf9977a810308ee37f5f02ed96226e0be87f8b908d
\ No newline at end of file

db/structure.sql

@@ -23535,7 +23535,7 @@ CREATE UNIQUE INDEX index_software_licenses_on_unique_name ON software_licenses
 
 CREATE UNIQUE INDEX index_sop_configs_on_project_id ON security_orchestration_policy_configurations USING btree (project_id);
 
-CREATE UNIQUE INDEX index_sop_configs_on_security_policy_management_project_id ON security_orchestration_policy_configurations USING btree (security_policy_management_project_id);
+CREATE INDEX index_sop_configurations_project_id_policy_project_id ON security_orchestration_policy_configurations USING btree (security_policy_management_project_id, project_id);
 
 CREATE INDEX index_sprints_iterations_cadence_id ON sprints USING btree (iterations_cadence_id);