By example

Each page is one program, and a note on what to look at.

• Helpdesk — a whole app, the one in A complete app.
• Fields — types and modifiers, including ref with on delete and pii.
• Approval — a workflow with requires and when.
• Audit loop — a self-loop with a guard.
• Ledger — an append-only ledger and a rollup.
• Dashboard — a query, a stat, and a list.
• Seed — rows that name each other.
• Contribute — a contribution to another app.
• Script — a script with a using grant, and one without.