SELECT pid, 
       usename,
       application_name,
       state,
       state_change,
       query
FROM pg_stat_activity 
WHERE 
    state = 'idle' 
    AND state_change < current_timestamp - interval '1 hour'
    AND pid <> pg_backend_pid()
    AND usename = 'postgres';

SELECT 
    datname, 
    usename, 
    application_name,
    state, 
    age(clock_timestamp(), state_change) as state_duration,
    age(clock_timestamp(), query_start) as query_duration,
    query
FROM pg_stat_activity 
WHERE state = 'idle'
ORDER BY state_duration DESC;

SELECT current_setting('max_connections') as max_connections,
       count(*) as current_connections,
       sum(CASE WHEN state = 'active' THEN 1 ELSE 0 END) as active_connections
FROM pg_stat_activity;