Default for TOAST is 2KB and how many chars you can fit in this space depends on encoding, could be as low as 1000 uncompressed. I think this limit can be adju

Default for TOAST is 2KB and how many chars you can fit in this space depends on encoding, could be as low as 1000 uncompressed. I think this limit can be adjusted, if you know that your message limit is 4000 chars its definitely a good idea.