fix: Issue 523, 536 to delete duplicate queries and create cost center schema and queries

backend/dataconnect/schema/hub.gql

@@ -5,6 +5,8 @@ type Hub @table(name: "hubs") {
   address: String
   nfcTagId: String
   ownerId: UUID!
+  costCenterId: UUID
+  costCenter: CostCenter @ref(fields: "costCenterId", references: "id")
   createdAt: Timestamp @default(expr: "request.time")
   updatedAt: Timestamp @default(expr: "request.time")
   createdBy: String