storage node per marketItem

[turadg]

(Capturing some of our discussion)

Background

Exo's use Endo Patterns to validate arguments. M.string() has a default length limit of 100k.

Chain storage is implemented as an Exo and thus any string value passed to it over 100k throws.

Problem

The market items collection currently serializes into one storage node.

Solution

Store each item in its own storage node.

When a market item is no longer for sale, the node is deleted. How to delete: Agoric/agoric-sdk#8063 (comment)

Note that it requires the node be created with sequence: false option. That inherited through the node hierarchy and our bootstrap root node is sequence: true. So your core proposal should override that with sequence: false and then all the contract's nodes will be configured that way.