-- Insert sample employee_shifts based on users and shifts
INSERT INTO employee_shifts (employee_id, shift_id, shift_date, start_time, end_time)
SELECT
    u.user_id,
    s.shift_id,
    CURRENT_DATE,
    s.start_time,
    s.end_time
FROM users u
CROSS JOIN shifts s
WHERE u.isDeleted = false
  AND s.isDeleted = false
LIMIT 20
ON CONFLICT DO NOTHING;