ON DELETE CASCADE is not needed (based on classifier tables)

Copy SQL

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,
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,
o.conkey AS target_col,
CASE WHEN o.confupdtype='a' THEN 'NO ACTION'
WHEN o.confupdtype='r' THEN 'RESTRICT'
WHEN o.confupdtype='c' THEN 'CASCADE'
WHEN o.confupdtype='n' THEN 'SET NULL'
WHEN o.confupdtype='d' THEN 'SET DEFAULT' END AS on_update,
'CASCADE' AS on_delete
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='c'),
fk_unnest as (select conname, foreign_schema, foreign_table,  foreign_table_oid, foreign_col, foreign_col_num, target_schema, target_table, target_table_oid, target_col, target_col_num, ordin, on_update, on_delete
from fk, unnest(fk.foreign_col, fk. target_col) with ordinality as f(foreign_col_num, target_col_num, ordin)),
fk_with_names as (select conname, foreign_schema, foreign_table, array_agg(a_foreign.attname order by ordin) as foreign_col, target_schema, target_table, array_agg(a_target.attname order by ordin) as target_col, on_update, on_delete
from fk_unnest fk inner join pg_attribute a_foreign on fk.foreign_col_num = 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_num = a_target.attnum and fk.target_table_oid = a_target.attrelid and a_target.attisdropped = false
group by conname, foreign_schema, foreign_table, target_schema, target_table,on_update, on_delete),

classifiers AS (SELECT A.table_schema, A.table_name 
FROM information_schema.tables A 
INNER JOIN information_schema.schemata S
  ON A.table_schema = S.schema_name
WHERE 
  A.table_type = 'BASE TABLE'
  AND (A.table_schema = 'public' OR S.schema_owner <> 'postgres')  
  AND A.table_name ~* '(klassifikaator|tüüp|tyyp|type|liik|liigid|mark|mudel|varv|kind|seisund|staatus|status|state|kood|code|sõnastik|sonastik|dict|register|loend|nimekiri|seadistus|kategoori|categor|lookup|ref|enum|class|model|color)'  
  AND A.table_name !~* '^[_]*(osapool|party|klient|customer|client|isik|person|kasutaja|user|toode|product|artikkel|article|teenus|service|töötaja|tootaja|employee|partner|ettevõte|ettevote|company|firma|organisatsioon|organization|leping|contract|asukoht|location|aadress|address|projekt|project|osakond|department)[_]*$'
  AND (SELECT Count(*) AS cnt FROM INFORMATION_SCHEMA.columns AS c
WHERE A.table_schema=c.table_schema
AND A.table_name=c.table_name)<=4
AND (SELECT Count(*) AS cnt FROM fk_with_names
WHERE A.table_schema=fk_with_names.target_schema
AND A.table_name=fk_with_names.target_table)<=1
)

select conname, foreign_schema, foreign_table, foreign_col, target_schema, target_table, target_col, on_update, on_delete
from fk_with_names
WHERE (foreign_schema, foreign_table) IN (SELECT table_schema, table_name
FROM classifiers)
order by target_schema, target_table, conname;