Store previous status

Author: stevebux

internal/datastore/src/__test__/letter-repository.test.ts

@@ -183,6 +183,7 @@ describe("LetterRepository", () => {
       "letter1",
     );
     expect(updatedLetter.status).toBe("REJECTED");
+    expect(updatedLetter.previousStatus).toBe("PENDING");
     expect(updatedLetter.reasonCode).toBe("R01");
     expect(updatedLetter.reasonText).toBe("Reason text");
   });

internal/datastore/src/letter-repository.ts

@@ -216,8 +216,8 @@ export class LetterRepository {
   }
 
   private buildUpdateExpression(letterToUpdate: UpdateLetter) {
-    let updateExpression =
-      "set #status = :status, updatedAt = :updatedAt, supplierStatus = :supplierStatus, #ttl = :ttl, eventId = :eventId";
+    let updateExpression = `set #status = :status, previousStatus = #status, updatedAt = :updatedAt, supplierStatus = :supplierStatus,
+                                #ttl = :ttl, eventId = :eventId`;
     const expressionAttributeValues: Record<string, any> = {
       ":status": letterToUpdate.status,
       ":updatedAt": new Date().toISOString(),

internal/datastore/src/types.ts

@@ -46,6 +46,7 @@ export const LetterSchema = LetterSchemaBase.extend({
   url: z.url(),
   createdAt: z.string(),
   updatedAt: z.string(),
+  previousStatus: LetterStatus.optional(),
   supplierStatus: z.string().describe("Secondary index PK"),
   supplierStatusSk: z.string().describe("Secondary index SK"),
   ttl: z.int(),