ON DELETE SET NULL is probably missing

with fk as (select 
o.conname,
(select nspname from pg_namespace where oid=f.relnamespace) as foreign_schema,
f.relname as foreign_table,
f.oid as foreign_table_oid,
unnest(o.confkey) AS foreign_col,
(select nspname from pg_namespace where oid=c.relnamespace) as target_schema,
c.relname as target_table, 
c.oid as target_table_oid,
unnest(o.conkey) AS target_col,
CASE WHEN o.confdeltype='c' THEN 'CASCADE'
WHEN o.confdeltype='r' THEN 'RESTRICT'
WHEN o.confdeltype='n' THEN 'SET NULL'
WHEN o.confdeltype='d' THEN 'SET DEFAULT'
ELSE 'NO ACTION' END AS on_delete_behavior
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
inner join pg_class f on f.oid = o.confrelid 
where o.contype = 'f' and o.confdeltype<>'n'),
fk_grouped as (
select fk.conname, fk.foreign_schema, foreign_table, array_agg(fk.foreign_table || '.' || a_foreign.attname order by  a_foreign.attnum) as foreign_col, 
fk.target_schema, fk.target_table, array_agg(fk.target_table  || '.' || a_target.attname  order by  a_target.attnum) as target_col,
array_agg(a_target.attnotnull order by  a_target.attnum) as target_not_null, fk.on_delete_behavior
from fk inner join pg_attribute a_foreign on fk.foreign_col = a_foreign.attnum and fk.foreign_table_oid = a_foreign.attrelid and a_foreign.attisdropped = false
inner join pg_attribute a_target on fk.target_col = a_target.attnum and fk.target_table_oid = a_target.attrelid and a_target.attisdropped = false
group by fk.conname, fk.foreign_schema, fk.foreign_table,  fk.target_schema, fk.target_table, fk.on_delete_behavior)
select conname, foreign_schema as schema, foreign_table as table, foreign_col, target_col, on_delete_behavior
from fk_grouped
where foreign_schema=target_schema and foreign_table=target_table and target_not_null @> array['f']::boolean[]
order by target_schema, target_table, conname;