fix: Update staff's cerficate schema to create queries and mutations

backend/dataconnect/connector/certificate/mutations.gql

@@ -5,7 +5,7 @@ mutation CreateCertificate(
   $status: CertificateStatus!
   $fileUrl: String
   $icon: String
-  $certificationType: ComplianceType
+  $certificationType: ComplianceType!
   $issuer: String
   $staffId: UUID!
   $validationStatus: ValidationStatus
@@ -63,3 +63,43 @@ mutation UpdateCertificate(
 mutation DeleteCertificate($id: UUID!) @auth(level: USER) {
   certificate_delete(id: $id) 
 }
+
+# UPSERT STAFF CERTIFICATE
+# Creates the certificate record if it does not exist, or updates
+# it if it already exists (matched by staffId + certificationType key).
+# Use this when uploading a certificate for the first time or
+# updating an existing one.
+#
+# To update multiple certificates in a single network call, use
+# aliased mutations in one GraphQL request from the client:
+#
+# mutation {
+#   cert1: upsertStaffCertificate(staffId: $id, certificationType: BACKGROUND_CHECK, ...)
+#   cert2: upsertStaffCertificate(staffId: $id, certificationType: FOOD_HANDLER, ...)
+# }
+# ------------------------------------------------------------
+mutation upsertStaffCertificate(
+  $staffId: UUID!
+  $certificationType: ComplianceType!
+  $name: String!
+  $status: CertificateStatus!
+  $fileUrl: String
+  $expiry: Timestamp
+  $issuer: String
+  $certificateNumber: String
+  $validationStatus: ValidationStatus
+) @auth(level: USER) {
+  certificate_upsert(
+    data: {
+      staffId: $staffId
+      certificationType: $certificationType
+      name: $name
+      status: $status
+      fileUrl: $fileUrl
+      expiry: $expiry
+      issuer: $issuer
+      certificateNumber: $certificateNumber
+      validationStatus: $validationStatus
+    }
+  )
+}

backend/dataconnect/schema/certificate.gql

@@ -30,7 +30,7 @@ enum ValidationStatus {
 }
 
 
-type Certificate @table(name: "certificates") {
+type Certificate @table(name: "certificates", key: ["staffId", "certificationType"]) {
   id: UUID! @default(expr: "uuidV4()")
 
   name: String!
@@ -39,7 +39,7 @@ type Certificate @table(name: "certificates") {
   status: CertificateStatus!
   fileUrl: String
   icon: String
-  certificationType: ComplianceType
+  certificationType: ComplianceType!
   issuer: String #Issuing Authority
   certificateNumber: String