(Re)create DataItems table

The data items should be described in the DRLS. E.g. see these tables

• https://docs.google.com/spreadsheets/d/1BbQkf8l8fCPSYf7skE8y0GC2UMK8kPWBkjY0ojhZqVs/edit#gid=751586500
• https://docs.google.com/document/d/1QqUBEb_dv5aKi8m30sc6DQQyJqM3jGRHuO_IXBDYMUc/edit#heading=h.lqb9msvz89l2

These tables (or a similar one) should be created from the data model.