Perhaps a state machine is implemented with timestamp columns

WITH timestamp_columns AS (SELECT table_schema, table_name, column_name, data_type, ordinal_position
FROM INFORMATION_SCHEMA.columns
WHERE data_type IN ('timestamp without time zone', 'timestamp with time zone')  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_at_least_two_event_cols AS (SELECT table_schema, table_name
FROM timestamp_columns
WHERE column_name~*'(accept|active|approve|change|clean|clear|close|create|delete|dirty|disable|enable|execute|hidden|inactive|lock|maile|modif|obsolete|on_hold|overlook|print|public|register|remove|restore|request|sent|submit|reject|update|use|valid|visible|withdraw)'
OR column_name~*'(aktiiv|eemalda|esita|kaivita|kinnita|kustuta|loo|lopeta|lukusta|meili|mitteaktiivne|nahtav|peata|peida|peidetud|prindi|puhas|registreeri|saada|saadetud|suletud|sulge|taasta|tyhista)'
GROUP BY table_schema, table_name
HAVING Count(*)>1)
SELECT table_schema, table_name, Count(*) AS nr_of_columns, string_agg(column_name || ' ' || data_type, ';<br>' ORDER BY ordinal_position) AS timestamp_columns
FROM timestamp_columns
WHERE (table_schema, table_name) IN (SELECT 
table_schema, table_name
FROM has_at_least_two_event_cols)
GROUP BY table_schema, table_name
ORDER BY Count(*) DESC, table_schema, table_name;