Hi all, I'm hunting for advice.  I am looking for a way to "lock" a webpage
so that only only one person at a time can edit database data.  Here is the
scenario, I have a database with a limited number of users who have write
access to the database, what I'd like to do is lock the editing page so that
if one of my users is editing a page then the other users will not be able
to edit the same page(data) at the same time.  I know that this is what
transactions are for in a database, but what I want to avoid is two people
looking at the same unedited data and then editing it.  I guess what I
really want to is lock a database when I use starts editing the data.  The
issues are:
1) How to make sure someone exits the edit mode nicely? what happens if they
enter the edit page, do nothing and just close the browser, I don't what to
leave the table locked
2) if the table is locked I would still like to let users view the data in
real time, jut not edit it.

I've used a "lock" table for this in the past, but the issue that I've never
figured out is how to make sure someone still needs the lock.  Again number
(1) from above.

I hope that this makes sense, I'll be using sqlalchemy and postgres on the
back end

thanks for any and all advice
jose

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