Short guide: How to use PostgresOperator in Apache Airflow? https://medium.com/@xnuinside/short-guide-how-to-use-postgresoperator-in-apache-airflow-ca78d35fb435 code samples in postgres_operator_example/

Apache Airflow: add validation tasks to production DAG for end-2-end tests https://medium.com/@xnuinside/apache-airflow-add-validation-tasks-to-production-dag-for-end-2-end-tests-184e6d0af991 code samples in wrapper_add_test_tasks_to_dag/

Airflow XCom pull and push under the hood: multiple value, from different dags and etc https://medium.com/@xnuinside/apache-airflow-add-validation-tasks-to-production-dag-for-end-2-end-tests-184e6d0af991 code samples in xcom_diff_dag_and_multiply/