Resubmit a stored event as a new undelivered event (closes #250)

internal/database/model_event.go

@@ -13,6 +13,14 @@ type Event struct {
 	Body        string `gorm:"type:text"   json:"body"`
 	ContentType string `json:"contentType"`
 
+	// ResubmittedFromID names the event this one was copied from by
+	// an operator resubmit. It is nil for an event that arrived on
+	// the receiver, which is every event created before the column
+	// existed. It is not a foreign key: the source event can be
+	// reaped by retention while its copies remain, and the id is
+	// kept as the record of where the copy came from either way.
+	ResubmittedFromID *string `gorm:"type:uuid;index" json:"resubmittedFromId,omitempty"`
+
 	// Relations
 	Webhook    Webhook    `json:"webhook,omitzero"`
 	Entrypoint Entrypoint `json:"entrypoint,omitzero"`