How to fix Canceling statement due to lock timeout in PostgreSQL

SHOW lock_timeout;

SELECT
  blocked_locks.pid AS blocked_pid,
  blocked_activity.usename AS blocked_user,
  blocked_activity.application_name AS blocked_app,
  blocking_locks.pid AS blocking_pid,
  blocking_activity.usename AS blocking_user,
  blocking_activity.application_name AS blocking_app,
  blocked_activity.query AS blocked_query,
  blocking_activity.query AS blocking_query,
  blocked_activity.state AS blocked_state,
  blocking_activity.state AS blocking_state
FROM pg_locks blocked_locks
JOIN pg_stat_activity blocked_activity ON blocked_activity.pid = blocked_locks.pid
JOIN pg_locks blocking_locks ON blocking_locks.locktype = blocked_locks.locktype
  AND blocking_locks.database IS NOT DISTINCT FROM blocked_locks.database
  AND blocking_locks.relation IS NOT DISTINCT FROM blocked_locks.relation
  AND blocking_locks.page IS NOT DISTINCT FROM blocked_locks.page
  AND blocking_locks.tuple IS NOT DISTINCT FROM blocked_locks.tuple
  AND blocking_locks.virtualxid IS NOT DISTINCT FROM blocked_locks.virtualxid
  AND blocking_locks.transactionid IS NOT DISTINCT FROM blocked_locks.transactionid
  AND blocking_locks.classid IS NOT DISTINCT FROM blocked_locks.classid
  AND blocking_locks.objid IS NOT DISTINCT FROM blocked_locks.objid
  AND blocking_locks.objsubid IS NOT DISTINCT FROM blocked_locks.objsubid
  AND blocking_locks.pid != blocked_locks.pid
JOIN pg_stat_activity blocking_activity ON blocking_activity.pid = blocking_locks.pid
WHERE NOT blocked_locks.granted
ORDER BY blocked_activity.query_start;

SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE pid != pg_backend_pid()
  AND query_start < NOW() - INTERVAL '10 minutes'
  AND state != 'idle';

SET lock_timeout = '30s';

ALTER ROLE myapp SET lock_timeout = '30s';

SET SESSION CHARACTERISTICS AS TRANSACTION ISOLATION LEVEL READ COMMITTED;

-- Explicit locking for rows you will modify
SELECT * FROM users WHERE id = 42 FOR UPDATE;
UPDATE users SET balance = balance - 100 WHERE id = 42;
COMMIT;

-- If you're doing SELECT FOR UPDATE on frequently-queried columns
CREATE INDEX idx_users_status ON users(status) WHERE status = 'active';

-- If you're updating rows with WHERE conditions
CREATE INDEX idx_orders_customer_date ON orders(customer_id, created_at);