Fix missions serialized document dates

packages/plugins/plugin-missions/src/mission-runtime.ts

@@ -158,6 +158,12 @@ function stringifyError(error: unknown) {
   return String(error);
 }
 
+function toIsoTimestamp(value: Date | string | null | undefined) {
+  if (value instanceof Date) return value.toISOString();
+  if (typeof value === "string") return value;
+  return new Date(0).toISOString();
+}
+
 function unique<T>(values: T[]) {
   return [...new Set(values)];
 }
@@ -240,7 +246,7 @@ async function parseMissionDocuments(
           issueId: issue.id,
           key: summary.key,
           title: summary.title,
-          updatedAt: summary.updatedAt.toISOString(),
+          updatedAt: toIsoTimestamp(summary.updatedAt),
           parsed: parseMissionValidationReportDocument(document.body, { round }),
         });
       } catch (error) {

packages/plugins/plugin-missions/tests/plugin.spec.ts

@@ -527,6 +527,14 @@ describe("missions plugin worker", () => {
       });
     }
 
+    const originalList = harness.ctx.issues.documents.list;
+    harness.ctx.issues.documents.list = async (...args) =>
+      (await originalList(...args)).map((summary) => ({
+        ...summary,
+        createdAt: summary.createdAt.toISOString(),
+        updatedAt: summary.updatedAt.toISOString(),
+      })) as unknown as Awaited<ReturnType<typeof originalList>>;
+
     const originalUpsert = harness.ctx.issues.documents.upsert;
     const documentUpdates: Array<{ key: string; baseRevisionId: string | null | undefined }> = [];
     harness.ctx.issues.documents.upsert = async (input) => {