portal-client: chec prepost token balance schema first

Author: belopash

common/changes/@subsquid/portal-client/master_2025-10-14-06-38.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@subsquid/portal-client",
+      "comment": "validate PrePostTokenBalance shape first to avoid fields truncation",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@subsquid/portal-client"
+}

util/portal-client/src/query/solana.ts

@@ -314,9 +314,9 @@ export function getBlockSchema<F extends FieldSelection>(fields: F): Validator<B
     let balance = object(project(BalanceShape, fields.balance))
 
     let tokenBalance = oneOf({
+        prePost: object(project(PrePostTokenBalanceShape, fields.tokenBalance)),
         pre: object(project(PreTokenBalanceShape, fields.tokenBalance)),
         post: object(project(PostTokenBalanceShape, fields.tokenBalance)),
-        prePost: object(project(PrePostTokenBalanceShape, fields.tokenBalance)),
     })
 
     let logMessage = object(project(LogMessageShape, fields.log))