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

backend/dataconnect/schema/costCenter.gql

@@ -0,0 +1,7 @@
+type CostCenter @table(name: "cost_centers") {
+  id: UUID! @default(expr: "uuidV4()")
+  name: String!
+  createdAt: Timestamp @default(expr: "request.time")
+  updatedAt: Timestamp @default(expr: "request.time")
+  createdBy: String
+}

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