diff --git a/app/src/main/scala/org/alephium/explorer/persistence/model/EventEntity.scala b/app/src/main/scala/org/alephium/explorer/persistence/model/EventEntity.scala
index f70c7266..abe4a053 100644
--- a/app/src/main/scala/org/alephium/explorer/persistence/model/EventEntity.scala
+++ b/app/src/main/scala/org/alephium/explorer/persistence/model/EventEntity.scala
@@ -67,7 +67,7 @@ object EventEntity {
       eventIndex,
       fields,
       order,
-      mainChain = true
+      mainChain = false
     )
   }
 }
diff --git a/app/src/main/scala/org/alephium/explorer/persistence/schema/CustomGetResult.scala b/app/src/main/scala/org/alephium/explorer/persistence/schema/CustomGetResult.scala
index 0262a95e..fb66f59e 100644
--- a/app/src/main/scala/org/alephium/explorer/persistence/schema/CustomGetResult.scala
+++ b/app/src/main/scala/org/alephium/explorer/persistence/schema/CustomGetResult.scala
@@ -377,7 +377,8 @@ object CustomGetResult {
         destructionTimestamp = result.<<?,
         destructionEventOrder = result.<<?,
         category = result.<<?,
-        interfaceId = result.<<?
+        interfaceId = result.<<?,
+        mainChain = result.<<
       )
 
   implicit val migrationVersionGetResult: GetResult[AppState.MigrationVersion] =
diff --git a/app/src/test/scala/org/alephium/explorer/GenDBModel.scala b/app/src/test/scala/org/alephium/explorer/GenDBModel.scala
index 287ea1ba..2c653f3d 100644
--- a/app/src/test/scala/org/alephium/explorer/GenDBModel.scala
+++ b/app/src/test/scala/org/alephium/explorer/GenDBModel.scala
@@ -239,7 +239,9 @@ object GenDBModel {
       token = token
     )
 
-  def eventEntityGen()(implicit groupSetting: GroupSetting): Gen[EventEntity] =
+  def eventEntityGen(
+      mainChain: Boolean = false
+  )(implicit groupSetting: GroupSetting): Gen[EventEntity] =
     for {
       blockHash       <- blockHashGen
       hash            <- transactionHashGen
@@ -249,16 +251,18 @@ object GenDBModel {
       eventIndex      <- Gen.posNum[Int]
       fields          <- Gen.listOf(valGen())
 
-    } yield EventEntity.from(
-      blockHash,
-      hash,
-      contractAddress,
-      inputAddress,
-      timestamp,
-      eventIndex,
-      fields,
-      0
-    )
+    } yield EventEntity
+      .from(
+        blockHash,
+        hash,
+        contractAddress,
+        inputAddress,
+        timestamp,
+        eventIndex,
+        fields,
+        0
+      )
+      .copy(mainChain = mainChain)
 
   def tokenOutputEntityGen(
       addressGen: Gen[Address] = addressGen,
diff --git a/app/src/test/scala/org/alephium/explorer/persistence/queries/EventQueriesSpec.scala b/app/src/test/scala/org/alephium/explorer/persistence/queries/EventQueriesSpec.scala
index 8cb38c45..cde8621b 100644
--- a/app/src/test/scala/org/alephium/explorer/persistence/queries/EventQueriesSpec.scala
+++ b/app/src/test/scala/org/alephium/explorer/persistence/queries/EventQueriesSpec.scala
@@ -43,7 +43,7 @@ class EventQueriesSpec
 
   "Event Queries" should {
     "get event by tx hash" in {
-      forAll(Gen.nonEmptyListOf(eventEntityGen())) { events =>
+      forAll(Gen.nonEmptyListOf(eventEntityGen(true))) { events =>
         insert(events)
 
         events.map { event =>
@@ -55,7 +55,7 @@ class EventQueriesSpec
     }
 
     "get all events with same tx hash" in {
-      forAll(Gen.nonEmptyListOf(eventEntityGen())) { events =>
+      forAll(Gen.nonEmptyListOf(eventEntityGen(true))) { events =>
         val txHash = transactionHashGen.sample.get
         val uniqueTxHashEvents = events.zipWithIndex.map { case (event, order) =>
           event.copy(txHash = txHash, eventOrder = order)
@@ -73,7 +73,7 @@ class EventQueriesSpec
     }
 
     "get event by contract address" in {
-      forAll(Gen.nonEmptyListOf(eventEntityGen())) { events =>
+      forAll(Gen.nonEmptyListOf(eventEntityGen(true))) { events =>
         insert(events)
 
         events.map { event =>
@@ -88,7 +88,7 @@ class EventQueriesSpec
     }
 
     "get all events with same contractAddress" in {
-      forAll(Gen.nonEmptyListOf(eventEntityGen())) { events =>
+      forAll(Gen.nonEmptyListOf(eventEntityGen(true))) { events =>
         val contractAddress = addressGen.sample.get
         val uniqueContractAddressEvents = events.map { event =>
           event.copy(contractAddress = contractAddress)
@@ -121,7 +121,7 @@ class EventQueriesSpec
     }
 
     "get event by contract address and input address" in {
-      forAll(Gen.nonEmptyListOf(eventEntityGen())) { events =>
+      forAll(Gen.nonEmptyListOf(eventEntityGen(true))) { events =>
         insert(events)
 
         events.map { event =>
@@ -153,7 +153,7 @@ class EventQueriesSpec
     }
 
     "get all events with same contractAddress and input address" in {
-      forAll(Gen.nonEmptyListOf(eventEntityGen())) { events =>
+      forAll(Gen.nonEmptyListOf(eventEntityGen(true))) { events =>
         val contractAddress = addressGen.sample.get
         val inputAddress    = addressGen.sample.get
         val uniqueContractAddressEvents = events.map { event =>