Do you have an example of such a queue somewhere? I think I have a rough idea about how it works because I implemented something similar about four years ago i

Do you have an example of such a queue somewhere? I think I have a rough idea about how it works because I implemented something similar about four years ago in PostgreSQL but kept getting locking issues I couldn't get out of: - https://stackoverflow.com/questions/33467813/concurrent-crawler-postgresql-query-issues https://stackoverflow.com/questions/33467813/concurrent-craw... - https://stackoverflow.com/questions/29807033/postgresql-concurrent-transaction-issues https://stackoverflow.com/questions/29807033/postgresql-conc... Also, what kind of queue size / concurrency on the polling side are you able to sustain for your current hardware?