Surrogate keys in classifier tables

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WITH fk AS (SELECT
(SELECT nspname FROM pg_namespace WHERE oid=c.relnamespace) AS target_schema,
c.relname AS target_table
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'),
tables_with_sequences AS (SELECT A.table_schema, A.table_name 
FROM information_schema.columns A LEFT JOIN information_schema.domains d USING (domain_schema, domain_name)
INNER JOIN information_schema.tables T
ON A.table_schema = T.table_schema
AND A.table_name = T.table_name
INNER JOIN information_schema.schemata S
ON A.table_schema=S.schema_name
WHERE (coalesce (A.column_default, d.domain_default) ILIKE '%nextval%' OR is_identity='YES')
AND (A.table_schema = 'public'
OR S.schema_owner<>'postgres')),
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
WHERE A.table_schema=fk.target_schema
AND A.table_name=fk.target_table)<=1
)
SELECT 
table_schema, 
table_name
FROM classifiers
WHERE (table_schema, table_name) IN (SELECT table_schema, table_name
FROM tables_with_sequences)
ORDER BY table_schema, table_name;