Query: cloud_billing_report_overview_dashboard_monthly_cost

select
  date_trunc('month', usage_start_time)::timestamp as "Month",
  round(sum(cost), 2) as "Total Cost"
from
  gcp_billing_report
where
  ('all' in ($1) or project_id in $1)
group by
  date_trunc('month', usage_start_time)
order by
  date_trunc('month', usage_start_time);