WITH plural_singular AS (SELECT nspname AS table_schema, relname AS table_name, 
CASE WHEN regexp_replace(relname,'(stats_|stats$|status$|state$|alias|address|pays$|group$|lock$|sys|class$)','','g') ~* '(?<!((^|_)[[:alnum:]]{0,2}|(^|_)[bcdfghjklmnpqrsztvwxz]{0,4}|s))s(_|$)' 
THEN 'Perhaps plural' ELSE 'Perhaps singular' END AS comment_about_the_table_name
FROM pg_class INNER JOIN pg_namespace ON pg_class.relnamespace=pg_namespace.oid
WHERE relkind='r'
AND nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),
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
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'),
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
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
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)
select conname, foreign_schema, foreign_table, foreign_col, psf.comment_about_the_table_name AS foreign_comment, 
target_schema, target_table, target_col, pst.comment_about_the_table_name AS target_comment
from fk_with_names AS fwn INNER JOIN plural_singular AS psf ON fwn.foreign_schema=psf.table_schema AND fwn.foreign_table=psf.table_name
INNER JOIN plural_singular AS pst ON fwn.target_schema=pst.table_schema AND fwn.target_table=pst.table_name
WHERE psf.comment_about_the_table_name<>pst.comment_about_the_table_name
order by target_schema, target_table, conname;