My question is in the context of smart contract development, so I'm looking for solutions that work within smart contracts:
1st: Is is possible to see the RAM delta of either an individual multi_table operation, or perhaps the current running total of RAM deltas at a certain point. For emplacing new rows this could obviously be calculated by hand because you know the size and who will pay for it, but for modifying/ erasing rows this depends on who previously paid for the row, and in the case of erasing it also depends on whether this is the last row in a scope, and if it is, it depends on who previously paid for the scope.
2nd: Is it possible to get who is currently paying for a table row and for the table scope.
These two things are obviously related, because if one of them is possible, the other one could also be calculated.