Perhaps a state machine is implemented with Boolean columns

WITH fk_columns AS (select target_schema as table_schema, target_table as table_name, a.attname as column_name
from (select 
(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
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
where o.contype = 'f') t
inner join pg_attribute a on t.target_col = a.attnum and t.target_table_oid = a.attrelid and a.attisdropped = false),
boolean_columns AS (SELECT table_schema, table_name, column_name, ordinal_position, data_type
FROM INFORMATION_SCHEMA.columns AS c
WHERE (data_type='boolean' 
OR (column_name~*'^(is|has|on)_' 
AND (data_type<>'boolean')
AND NOT EXISTS (SELECT *
FROM fk_columns
WHERE fk_columns.table_schema=c.table_schema
AND fk_columns.table_name=c.table_name
AND fk_columns.column_name=c.column_name))) 
AND (table_schema, table_name) IN (SELECT table_schema, table_name
FROM INFORMATION_SCHEMA.tables WHERE table_type='BASE TABLE') 
AND table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),
has_event_cols AS (SELECT table_schema, table_name
FROM boolean_columns
WHERE column_name~*'(accept|active|approve|change|clean|clear|close|create|delete|dirty|disable|enable|execute|hidden|inactive|lock|maile|modif|open|obsolete|on_hold|overlook|print|public|register|remove|restore|request|sent|submit|reject|update|use|valid|visible|withdraw)'
OR column_name~*'(aktiiv|avatud|eemalda|esita|kaivita|kinnita|kustuta|loo|lopeta|lukusta|meili|mitteaktiivne|nahtav|peata|peida|peidetud|prindi|puhas|registreeri|saada|saadetud|suletud|sulge|taasta|tyhista)')
SELECT table_schema, table_name, Count(*) AS nr_of_columns, string_agg(column_name || '(' || data_type || ')', ';<br>' ORDER BY ordinal_position) AS boolean_columns
FROM boolean_columns
WHERE (table_schema, table_name) IN (SELECT 
table_schema, table_name
FROM has_event_cols)
GROUP BY table_schema, table_name
ORDER BY Count(*) DESC, table_schema, table_name;