A library equality pin on one row: the write only commits while the row's attribute still holds the value the library resolved a guard through (EX: the foreign key read before an update, or a child's foreign key pointing at its parent)
The table attribute name, which must be a valid expression token
Reported when the row exists but the attribute no longer holds the value: a concurrent-change or not-related message
The value the attribute must hold
A library equality pin on one row: the write only commits while the row's attribute still holds the value the library resolved a guard through (EX: the foreign key read before an update, or a child's foreign key pointing at its parent)