https://habrahabr.ru/company/postgrespro/blog/270827/

2018
https://www.citusdata.com/blog/2018/02/22/seven-tips-for-dealing-with-postgres-locks/
    https://habr.com/ru/company/otus/blog/452986/
2015
https://habr.com/en/company/postgrespro/blog/270827/

samples
select ... for update;