Add unique index for security training providers

Changelog: changed

db/post_migrate/20220304201847_add_unique_index_on_security_training_providers.rb

+# frozen_string_literal: true
+
+class AddUniqueIndexOnSecurityTrainingProviders < Gitlab::Database::Migration[1.0]
+  INDEX_NAME = 'index_security_training_providers_on_unique_name'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :security_training_providers, :name, unique: true, name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index_by_name :security_training_providers, INDEX_NAME
+  end
+end

db/schema_migrations/20220304201847

+d60a313ac68b0edfe1ae219690aacbe74c038b90bc4239f67d14f9ced36d67f6
\ No newline at end of file

db/structure.sql

@@ -28954,6 +28954,8 @@ CREATE INDEX index_security_scans_on_pipeline_id ON security_scans USING btree (
 
 CREATE INDEX index_security_scans_on_project_id ON security_scans USING btree (project_id);
 
+CREATE UNIQUE INDEX index_security_training_providers_on_unique_name ON security_training_providers USING btree (name);
+
 CREATE INDEX index_security_trainings_on_project_id ON security_trainings USING btree (project_id);
 
 CREATE INDEX index_security_trainings_on_provider_id ON security_trainings USING btree (provider_id);