Hi @jc_jgplc
ToastData table is a Postgres mechanism to store data when data block size exceed a certain size (typical 8KB), since Adobe store large chunks of HTML, it contains mostly information related to Delivery.
This is an internal Postgres table and I would not worry to much about it.
As you know ACS clears data following its retention policy (usually 6 months). this will not clear much on the Toast Data table. though...
What's the size of your Delivery table? IF you have a large volume of deliveries (by the 100,000s), you could start to look at deleting old deliveries from the solution.
Please note, deleting deliveries in ACS does not delete them from the Report side of the solution, it delete them from the operational side
Do you experience performance issues that could point to this volume?
Hope this helps,
Thanks
Denis