internal: incomplete vault systems behind feature flag (#2340)

packages/models/src/Domain/Abstract/TransferPayload/Interfaces/TransferPayload.ts

@@ -1,5 +1,6 @@
 import { ContentType } from '@standardnotes/common'
 import { ItemContent } from '../../Content/ItemContent'
+import { PersistentSignatureData } from '../../../Runtime/Encryption/PersistentSignatureData'
 
 export interface TransferPayload<C extends ItemContent = ItemContent> {
   uuid: string
@@ -15,9 +16,16 @@ export interface TransferPayload<C extends ItemContent = ItemContent> {
   dirtyIndex?: number
   globalDirtyIndexAtLastSync?: number
   dirty?: boolean
+  signatureData?: PersistentSignatureData
 
   lastSyncBegan?: Date
   lastSyncEnd?: Date
 
   duplicate_of?: string
+  user_uuid?: string
+
+  key_system_identifier?: string | undefined
+  shared_vault_uuid?: string | undefined
+
+  last_edited_by_uuid?: string
 }