Swift: Test a mutation without committing it

Executes the mutation but rolls back the transaction instead of committing it, so no changes are persisted.

• The mutation runs and its result (including side effects such as triggers) is returned in the response, but the transaction is rolled back afterward.
• Useful for testing mutations without touching real data.
• Requires PostgREST's db-tx-end setting to allow client-controlled transaction rollback.

Examples

With `update()`

try await supabase
  .from("todos")
  .update(["done": true])
  .eq("id", value: 1)
  .select()
  .dryRun()
  .execute()
// Row is not actually updated in the database.