Changing lastPriceToken in Token from string to Token

schema.graphql

@@ -59,7 +59,7 @@ type Token @entity {
     "block number when it was created"                                   
     block: Int!           
 
-    lastPriceToken: String!
+    lastPriceToken: Token
     lastPriceValue: BigDecimal!
 }
 
@@ -278,7 +278,7 @@ type Order @entity {
   tx: String!
   block: Int!
 
-  lastPriceToken: Token!
+  lastPriceToken: Token
   lastPriceValue: BigDecimal!
   estimatedUSDValue: BigDecimal!
 }

src/mappings/erc20Templates.ts

@@ -69,6 +69,7 @@ export function handleOrderStarted(event: OrderStarted): void {
     order.createdTimestamp
   )
   order.save()
+  log.info('\n\n3 A. order.lastPriceToken: {}\n\n', [order.lastPriceToken])
   token.save()
   addOrder()
   if (token.nft) {