diff --git a/flow/e2e/clickhouse/peer_flow_ch_test.go b/flow/e2e/clickhouse/peer_flow_ch_test.go
index 5e636adee1..dfd0c8d99a 100644
--- a/flow/e2e/clickhouse/peer_flow_ch_test.go
+++ b/flow/e2e/clickhouse/peer_flow_ch_test.go
@@ -190,21 +190,17 @@ func (s ClickHouseSuite) Test_NullableMirrorSetting() {
 	srcFullName := s.attachSchemaSuffix(srcTableName)
 	dstTableName := "test_nullable_mirror_dst"
 
-	_, err := s.Conn().Exec(context.Background(), fmt.Sprintf(`
+	require.NoError(s.t, s.source.Exec(fmt.Sprintf(`
 		CREATE TABLE IF NOT EXISTS %s (
 			id SERIAL PRIMARY KEY,
-			key TEXT NOT NULL,
+			ky TEXT NOT NULL,
 			val TEXT,
 			n NUMERIC,
 			t TIMESTAMP
 		);
-	`, srcFullName))
-	require.NoError(s.t, err)
+	`, srcFullName)))
 
-	_, err = s.Conn().Exec(context.Background(), fmt.Sprintf(`
-	INSERT INTO %s (key) VALUES ('init');
-	`, srcFullName))
-	require.NoError(s.t, err)
+	require.NoError(s.t, s.source.Exec(fmt.Sprintf(`INSERT INTO %s (ky) VALUES ('init')`, srcFullName)))
 
 	connectionGen := e2e.FlowConnectionGenerationConfig{
 		FlowJobName:      s.attachSuffix("ch_nullable_mirror"),
@@ -219,14 +215,11 @@ func (s ClickHouseSuite) Test_NullableMirrorSetting() {
 	env := e2e.ExecutePeerflow(tc, peerflow.CDCFlowWorkflow, flowConnConfig, nil)
 	e2e.SetupCDCFlowStatusQuery(s.t, env, flowConnConfig)
 
-	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on initial", srcTableName, dstTableName, "id,\"key\",val,n,t")
+	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on initial", srcTableName, dstTableName, "id,ky,val,n,t")
 
-	_, err = s.Conn().Exec(context.Background(), fmt.Sprintf(`
-	INSERT INTO %s (key) VALUES ('cdc');
-	`, srcFullName))
-	require.NoError(s.t, err)
+	require.NoError(s.t, s.source.Exec(fmt.Sprintf(`INSERT INTO %s (ky) VALUES ('cdc')`, srcFullName)))
 
-	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on cdc", srcTableName, dstTableName, "id,\"key\",val,n,t")
+	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on cdc", srcTableName, dstTableName, "id,ky,val,n,t")
 
 	env.Cancel()
 	e2e.RequireEnvCanceled(s.t, env)
@@ -237,21 +230,17 @@ func (s ClickHouseSuite) Test_NullableColumnSetting() {
 	srcFullName := s.attachSchemaSuffix(srcTableName)
 	dstTableName := "test_nullable_column_dst"
 
-	_, err := s.Conn().Exec(context.Background(), fmt.Sprintf(`
+	require.NoError(s.t, s.source.Exec(fmt.Sprintf(`
 		CREATE TABLE IF NOT EXISTS %s (
 			id SERIAL PRIMARY KEY,
-			key TEXT NOT NULL,
+			ky TEXT NOT NULL,
 			val TEXT,
 			n NUMERIC,
 			t TIMESTAMP
 		);
-	`, srcFullName))
-	require.NoError(s.t, err)
+	`, srcFullName)))
 
-	_, err = s.Conn().Exec(context.Background(), fmt.Sprintf(`
-	INSERT INTO %s (key) VALUES ('init');
-	`, srcFullName))
-	require.NoError(s.t, err)
+	require.NoError(s.t, s.source.Exec(fmt.Sprintf(`INSERT INTO %s (ky) VALUES ('init')`, srcFullName)))
 
 	connectionGen := e2e.FlowConnectionGenerationConfig{
 		FlowJobName:      s.attachSuffix("ch_nullable_column"),
@@ -262,7 +251,7 @@ func (s ClickHouseSuite) Test_NullableColumnSetting() {
 	flowConnConfig.DoInitialSnapshot = true
 	for _, tm := range flowConnConfig.TableMappings {
 		tm.Columns = []*protos.ColumnSetting{
-			{SourceName: "key", NullableEnabled: true},
+			{SourceName: "ky", NullableEnabled: true},
 			{SourceName: "val", NullableEnabled: true},
 			{SourceName: "n", NullableEnabled: true},
 			{SourceName: "t", NullableEnabled: true},
@@ -273,14 +262,11 @@ func (s ClickHouseSuite) Test_NullableColumnSetting() {
 	env := e2e.ExecutePeerflow(tc, peerflow.CDCFlowWorkflow, flowConnConfig, nil)
 	e2e.SetupCDCFlowStatusQuery(s.t, env, flowConnConfig)
 
-	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on initial", srcTableName, dstTableName, "id,\"key\",val,n,t")
+	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on initial", srcTableName, dstTableName, "id,ky,val,n,t")
 
-	_, err = s.Conn().Exec(context.Background(), fmt.Sprintf(`
-	INSERT INTO %s (key) VALUES ('cdc');
-	`, srcFullName))
-	require.NoError(s.t, err)
+	require.NoError(s.t, s.source.Exec(fmt.Sprintf(`INSERT INTO %s (ky) VALUES ('cdc')`, srcFullName)))
 
-	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on cdc", srcTableName, dstTableName, "id,\"key\",val,n,t")
+	e2e.EnvWaitForEqualTablesWithNames(env, s, "waiting on cdc", srcTableName, dstTableName, "id,ky,val,n,t")
 
 	env.Cancel()
 	e2e.RequireEnvCanceled(s.t, env)