refs

https://reflectoring.io/spring-scheduler/
https://www.baeldung.com/shedlock-spring
https://rieckpil.de/lock-scheduled-tasks-with-shedlock-and-spring-boot/
https://github.com/lukas-krecan/ShedLock
http://buraktas.com/spring-shedlock-tutorial/
https://www.baeldung.com/spring-scheduled-tasks

https://dipu11.medium.com/spring-boot-scheduler-for-distributed-system-using-shedlock-f9ff799db4e0
https://www.vincenzoracca.com/en/blog/framework/spring/shedlock/



https://www.yawintutor.com/how-to-start-and-stop-scheduler-in-spring-boot/#:~:text=The%20ScheduledAnnotationBeanPostProcessor%20class%20allows%20you,restart%20the%20spring%20boot%20application.


https://riptutorial.com/spring/example/21209/cron-expression

https://gitee.com/caozhitong/ShedLock

https://faun.pub/spring-scheduler-in-multi-node-environment-49814e031e7c



https://discourse.hibernate.org/t/why-does-hibernate-orm-uses-datetime-by-default-on-mysql-instead-of-timestamp/422
http://www.java2s.com/Tutorials/Java/JPA/0100__JPA_Column_Definition.htm
http://www.masterspringboot.com/data-access/jpa-applications/how-to-get-your-tables-automatically-created-with-spring-boot/
https://howtodoinjava.com/hibernate/date-time-mappings/



// scaling 
https://docker-docs.netlify.app/get-started/part3/#docker-composeyml

//docker swarm intro 
https://docker-docs.netlify.app/get-started/part3/

// docker database connection host detaiuls
https://stackoverflow.com/questions/24319662/from-inside-of-a-docker-container-how-do-i-connect-to-the-localhost-of-the-mach

https://github.com/tiangolo/full-stack-fastapi-postgresql/issues/273
https://github.com/openfaas/faas/issues/198


https://gitee.com/caozhitong/ShedLock

// debug properties
https://backendnotes.com/distributed-locks-using-shedlock/