Create a trigger to update the updated_at field for every table that has it.

auto_update_updated_at_triggers.sql

SET TIME ZONE 'America/New_York';

create extension if not exists moddatetime schema extensions;

DO $$
DECLARE
    r RECORD;
    trigger_name text;
BEGIN
    FOR r IN
        SELECT table_schema, table_name
        FROM information_schema.columns
        WHERE column_name = 'updated_at'
          AND table_schema = 'public'
    LOOP
        trigger_name := format('handle_updated_at_%s', lower(r.table_name));

        BEGIN
            EXECUTE format('
                CREATE TRIGGER %I
                BEFORE UPDATE ON %I.%I
                FOR EACH ROW
                EXECUTE FUNCTION moddatetime(''updated_at'')',
                trigger_name, r.table_schema, r.table_name);
        EXCEPTION
            WHEN duplicate_object THEN
        END;
    END LOOP;
END;
$$;