feat: add governed postbox delivery and report hardening

webui/src/features/campaigns/CampaignListPage.tsx

@@ -32,7 +32,11 @@ export default function CampaignListPage({ settings }: {settings: ApiSettings;})
       let response: CampaignDeltaResponse;
       do {
         response = await listCampaignsDelta(settings, { since: nextWatermark });
-        nextCampaigns = mergeCampaignDelta(nextCampaigns, response);
+        nextCampaigns = mergeCampaignDelta(
+          nextCampaigns,
+          response,
+          Boolean(response.full && nextWatermark?.startsWith("full:campaigns:"))
+        );
         nextWatermark = response.watermark ?? null;
       } while (response.has_more);
       setCampaigns(nextCampaigns);
@@ -199,8 +203,12 @@ function formatLoadedAt(value: Date): string {
   return formatDateTimeFromDate(value, { second: "2-digit" });
 }
 
-function mergeCampaignDelta(current: CampaignListItem[], response: CampaignDeltaResponse): CampaignListItem[] {
-  if (response.full) return response.campaigns;
+function mergeCampaignDelta(
+  current: CampaignListItem[],
+  response: CampaignDeltaResponse,
+  continuingFullSnapshot = false
+): CampaignListItem[] {
+  if (response.full && !continuingFullSnapshot) return response.campaigns;
   return mergeDeltaRows(current, response.campaigns, response.deleted, (campaign) => campaign.id, {
     deletedResourceType: "campaign",
     sort: sortCampaignsByUpdatedDesc