Triggers can be defined for INSERT, DELETE, and UPDATE operations on system-time tables.
Note the following:
Actions are triggered only for actions on open rows, that is, rows that have not been
logically deleted from the table.
Defined actions cannot reference the component beginning or ending bound TIMESTAMP
columns of the SYSTEM_TIME derived period column.
The DELETE or UPDATE operation that triggers an action can be unqualified or can include
the temporal FOR PORTION OF qualifier.
Trigger actions on ANSI temporal tables can be qualified with FOR PORTION OF.