If i'm managing a quant shop thread and every 3 days i want to show last trades, how can that have no point? How can it be better to delete previous post and create new one and loosing track of all example trades posted?
In this case you could simply edit your last post to include the new trades / information.
If you simply edit your last post and put new information about the trades, your thread will remain buried somewhere (If no one replies on it) and no one will notice if you posted any new trades or not.
A better option will be to copy the last post content, delete the last post, and make the new post with the old trade data (last Post) + the new trade data. This way your thread will also be on top of the list and the new information will also be posted and there will be no bump related issues.
Correct me i am wrong ?