Define a new GSI for post-dated enrichment

Author: wildjames

SAMtemplates/tables/main.yaml

@@ -184,7 +184,6 @@ Resources:
               - TerminalStatus
               - LastModified
               - Status
-              - PostDatedLastModifiedSetAt # TODO: Remove this when we deprecate post modified prescriptions.
             ProjectionType: INCLUDE
           ProvisionedThroughput: !If
             - EnableDynamoDBAutoScalingCondition
@@ -202,6 +201,27 @@ Resources:
             - ReadCapacityUnits: 1
               WriteCapacityUnits: !Ref MinWritePrescriptionStatusUpdatesCapacity
             - !Ref "AWS::NoValue"
+        # TODO: Remove this when we deprecate post modified prescriptions.
+        - IndexName: PharmacyODSCodePrescriptionIDIndexPostDatedIndex
+          KeySchema:
+            - AttributeName: PharmacyODSCode
+              KeyType: HASH
+            - AttributeName: PrescriptionID
+              KeyType: RANGE
+          Projection:
+            NonKeyAttributes:
+              - PatientNHSNumber
+              - LineItemID
+              - TerminalStatus
+              - LastModified
+              - Status
+              - PostDatedLastModifiedSetAt
+            ProjectionType: INCLUDE
+          ProvisionedThroughput: !If
+            - EnableDynamoDBAutoScalingCondition
+            - ReadCapacityUnits: 1
+              WriteCapacityUnits: !Ref MinWritePrescriptionStatusUpdatesCapacity
+            - !Ref "AWS::NoValue"
       Tags:
         - Key: "EPS-Tablename"
           Value: "PrescriptionStatusUpdates"

packages/postDatedLambda/src/databaseClient.ts

@@ -11,7 +11,7 @@ import {
 
 const client = new DynamoDBClient()
 const tableName = process.env.TABLE_NAME ?? "PrescriptionStatusUpdates"
-const pharmacyPrescriptionIndexName = "PharmacyODSCodePrescriptionIDIndex"
+const pharmacyPrescriptionIndexName = "PharmacyODSCodePrescriptionIDIndexPostDatedIndex"
 
 export function createPrescriptionLookupKey(prescriptionID: string, pharmacyODSCode: string): string {
   return `${prescriptionID.toUpperCase()}#${pharmacyODSCode.toUpperCase()}`