diff --git a/examples/x2y2-database/src/processor.test.ts b/examples/x2y2-database/src/processor.test.ts
index 3bbccb564..a7e05168b 100644
--- a/examples/x2y2-database/src/processor.test.ts
+++ b/examples/x2y2-database/src/processor.test.ts
@@ -1,16 +1,31 @@
 import assert from 'assert'
 import { before, describe, test } from 'node:test'
 import { TestProcessorServer } from '@sentio/sdk/testing'
+import { mockTransferLog } from '@sentio/sdk/eth/builtin/erc20'
+import { User } from './schema/schema.js'
 
 describe('Test Processor', () => {
-  const service = new TestProcessorServer(async () => await import('./processor.js'))
+  const server = new TestProcessorServer(async () => await import('./processor.js'))
 
   before(async () => {
-    await service.start()
+    await server.start()
   })
 
   test('has config', async () => {
-    const config = await service.getConfig({})
+    const config = await server.getConfig({})
     assert(config.contractConfigs.length > 0)
   })
+
+  test('data is upsert', async () => {
+    await server.eth.testLog(
+      mockTransferLog('0x1e4ede388cbc9f4b5c79681b7f94d36a11abebc9', {
+        from: '0x0000000000000000000000000000000000000000',
+        to: '0xb329e39ebefd16f40d38f07643652ce17ca5bac1',
+        value: 10n ** 18n * 10n
+      })
+    )
+
+    const from = await server.store.list(User)
+    assert(from.length == 2)
+  })
 })
diff --git a/examples/x2y2-database/src/processor.ts b/examples/x2y2-database/src/processor.ts
index 83d5606a9..49cf58fa4 100644
--- a/examples/x2y2-database/src/processor.ts
+++ b/examples/x2y2-database/src/processor.ts
@@ -37,13 +37,13 @@ ERC20Processor.bind({ address: '0x1e4ede388cbc9f4b5c79681b7f94d36a11abebc9' }).o
     // exporter.emit(ctx, event)
     const from = new User({
       name: 'from',
-      id: event.args.from
+      id: event.args.from.toLowerCase()
     })
 
     await ctx.store.upsert(from)
     const to = new User({
       name: 'to',
-      id: event.args.to
+      id: event.args.to.toLowerCase()
     })
     await ctx.store.upsert(to)
     const transfer = new Transfer({