List Invoice Periods
GET/api/v1/drafts/periods
Year/month rollup of invoices by issue_date for the sidebar accordion.
Drafts without an issue_date are bucketed under year=null.
Counts split by email_sent_source so the UI can show
"imported" vs "sent via GoRoute" vs "not sent" totals.
Responsesโ
- 200
Successful Response