Re: Preventing free space from being reused

[Michael Lewis]

If you have no updates or deletes, then I would wonder about setting
fillfactor LOWER such that new rows are less likely to find a gap that is
acceptable. Depending how/when you use the json, lowering
toast_tuple_target may be appropriate to store (nearly?) all out of line
and making the data stored in the main relation be more uniform in size.
Are you seeing significant toast usage currently?