A signature applies to a whole major: minor publishes keep it and the
export unions signatures across every minor of the major. The request
guard was scoped to a single minor, so re-requesting on a newer minor
(or twice on the same version) inserted duplicate rows and a signatory
appeared several times on the exported signature page.
Deduplicate by loading any existing signature across the major before
inserting, cancel still-pending requests from prior majors when a new
major is published, and restrict the export to active signatories
(comparing contract end dates against the current date). A migration
collapses the duplicate rows already in the table, preferring a signed
row over a pending one and then the most recent.
Signed-off-by: Bryan Frimin <bryan@probo.com>
1a8ca29264