Prevent deletes in a versioned table at the database level

This trigger on the DELETES table seems to work.

CREATE OR REPLACE TRIGGER D202574_custom
BEFORE INSERT ON D202574
FOR EACH ROW
DECLARE 
    v_upd_row NUMBER;
BEGIN
    SELECT COUNT(1) INTO v_upd_row 
    FROM A202574
    WHERE objectid = :new.sde_deletes_row_id
    AND sde_state_id = :new.deleted_at;

    IF v_upd_row = 0 THEN
         raise_application_error(-20001, 'Deleting has been disabled via a custom trigger.');
    END IF;
END ;

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Edit:

For bonus points, I only prevented deletes if the record was created before a certain date (last Monday at 12:00 AM).

I did this because my data is synced to an external system on weekends. I want to prevent users from deleting records that have already been synced to the external system.

create or replace trigger v202577_delete_custom
    before insert
    on d202577
    for each row
declare
    v_upd_row       number;
    v_cre_date_row   number;
begin
    select
        count (1)
        into v_upd_row
        from a202577
     where
        objectid = :new.sde_deletes_row_id
        and sde_state_id = :new.deleted_at;
 
    select
        count (1)
        into v_cre_date_row
    from
        a_test_fc a
     where
        a.objectid = :new.sde_deletes_row_id
        and a.created_date < trunc(next_day (sysdate - 6, 'monday'));
 
    if v_upd_row = 0 and v_cre_date_row > 0
    then
        raise_application_error ( -20001, 'Deleting has been disabled via a custom trigger.');
    end if;
end;