diff --git a/build/charts/theia/provisioning/datasources/init.sh b/build/charts/theia/provisioning/datasources/init.sh
index 0f77240a..ed4bee64 100644
--- a/build/charts/theia/provisioning/datasources/init.sh
+++ b/build/charts/theia/provisioning/datasources/init.sh
@@ -19,20 +19,5 @@ set -e
 THIS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 
 source $THIS_DIR/create_table.sh
-
-# This function is kept to be compatible with version below v0.3.0
-function setDataVersion {
-    tables=$(clickhouse client -h 127.0.0.1 -q "SHOW TABLES")
-    if [[ $tables == *"migrate_version"* ]]; then
-        clickhouse client -h 127.0.0.1 -q "ALTER TABLE migrate_version DELETE WHERE version!=''"
-    else
-        clickhouse client -h 127.0.0.1 -q "CREATE TABLE migrate_version (version String) engine=MergeTree ORDER BY version"
-    fi
-    clickhouse client -h 127.0.0.1 -q "INSERT INTO migrate_version (*) VALUES ('{{ .Chart.Version }}')"
-    echo "=== Set data schema version to {{ .Chart.Version }} ==="
-}
-
 ../clickhouse-schema-management
 createTable
-setDataVersion
-
diff --git a/build/charts/theia/provisioning/datasources/migrators/downgrade/0-3-0_0-2-0.sql b/build/charts/theia/provisioning/datasources/migrators/downgrade/0-3-0_0-2-0.sql
deleted file mode 100644
index 627488e0..00000000
--- a/build/charts/theia/provisioning/datasources/migrators/downgrade/0-3-0_0-2-0.sql
+++ /dev/null
@@ -1,5 +0,0 @@
---Alter table to drop new columns
-ALTER TABLE flows
-DROP clusterUUID String;
-ALTER TABLE flows_local
-DROP clusterUUID String;
diff --git a/build/charts/theia/templates/_helpers.tpl b/build/charts/theia/templates/_helpers.tpl
index fbe54d48..0db6b7a8 100644
--- a/build/charts/theia/templates/_helpers.tpl
+++ b/build/charts/theia/templates/_helpers.tpl
@@ -78,10 +78,6 @@
       - key: {{ regexReplaceAll "(.*)/" $path "" }}
         path: {{ regexReplaceAll "(.*)/" $path "" }}
       {{- end }}
-      {{- range $path, $_ :=  $Files.Glob  "provisioning/datasources/migrators/downgrade/*" }}
-      - key: {{ regexReplaceAll "(.*)/" $path "" }}
-        path: migrators/downgrade/{{ regexReplaceAll "(.*)/" $path "" }}
-      {{- end }}
       {{- range $path, $_ :=  $Files.Glob  "provisioning/datasources/migrators/*.sql" }}
       - key: {{ regexReplaceAll "(.*)/" $path "" }}
         path: migrators/{{ regexReplaceAll "(.*)/" $path "" }}
diff --git a/build/charts/theia/templates/clickhouse/configmap.yaml b/build/charts/theia/templates/clickhouse/configmap.yaml
index f632eec5..07cccddc 100644
--- a/build/charts/theia/templates/clickhouse/configmap.yaml
+++ b/build/charts/theia/templates/clickhouse/configmap.yaml
@@ -5,5 +5,4 @@ metadata:
   namespace: {{ .Release.Namespace }}
 data:
 {{ tpl (.Files.Glob "provisioning/datasources/*.sh").AsConfig . | indent 2 }}
-{{ tpl (.Files.Glob "provisioning/datasources/migrators/downgrade/*").AsConfig . | indent 2 }}
 {{ (.Files.Glob "provisioning/datasources/migrators/*.sql").AsConfig | indent 2 }}
diff --git a/build/yamls/flow-visibility.yml b/build/yamls/flow-visibility.yml
index 2f0032f3..0349143d 100644
--- a/build/yamls/flow-visibility.yml
+++ b/build/yamls/flow-visibility.yml
@@ -53,12 +53,6 @@ subjects:
 ---
 apiVersion: v1
 data:
-  0-3-0_0-2-0.sql: |
-    --Alter table to drop new columns
-    ALTER TABLE flows
-    DROP clusterUUID String;
-    ALTER TABLE flows_local
-    DROP clusterUUID String;
   000001_0-1-0.down.sql: ""
   000001_0-1-0.up.sql: |
     --Create a table to store records
@@ -482,7 +476,7 @@ data:
         engine=Distributed('{cluster}', default, recommendations_local, rand());
     EOSQL
     }
-  init.sh: |+
+  init.sh: |
     #!/usr/bin/env bash
 
     # Copyright 2022 Antrea Authors.
@@ -504,23 +498,8 @@ data:
     THIS_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 
     source $THIS_DIR/create_table.sh
-
-    # This function is kept to be compatible with version below v0.3.0
-    function setDataVersion {
-        tables=$(clickhouse client -h 127.0.0.1 -q "SHOW TABLES")
-        if [[ $tables == *"migrate_version"* ]]; then
-            clickhouse client -h 127.0.0.1 -q "ALTER TABLE migrate_version DELETE WHERE version!=''"
-        else
-            clickhouse client -h 127.0.0.1 -q "CREATE TABLE migrate_version (version String) engine=MergeTree ORDER BY version"
-        fi
-        clickhouse client -h 127.0.0.1 -q "INSERT INTO migrate_version (*) VALUES ('0.5.0')"
-        echo "=== Set data schema version to 0.5.0 ==="
-    }
-
     ../clickhouse-schema-management
     createTable
-    setDataVersion
-
 kind: ConfigMap
 metadata:
   name: clickhouse-mounted-configmap
@@ -6386,8 +6365,6 @@ spec:
               path: create_table.sh
             - key: init.sh
               path: init.sh
-            - key: 0-3-0_0-2-0.sql
-              path: migrators/downgrade/0-3-0_0-2-0.sql
             - key: 000001_0-1-0.down.sql
               path: migrators/000001_0-1-0.down.sql
             - key: 000001_0-1-0.up.sql
diff --git a/docs/network-flow-visibility.md b/docs/network-flow-visibility.md
index 163c0ad6..87e71ed2 100644
--- a/docs/network-flow-visibility.md
+++ b/docs/network-flow-visibility.md
@@ -239,6 +239,10 @@ you use PersistentVolume for ClickHouse. To downgrade from v0.2 to v0.1, you
 need to uninstall ClickHouse, delete related data if you use PersistenVolume
 and redeploy it.
 
+In v0.3, we add a breaking change to ClickHouse data migration. To downgrade
+from a version after v0.3 to a version before v0.3 without data lossing. Please
+first downgrade it to v0.3 and then to the version below v0.3.
+
 A ClickHouse cluster consists of one or more shards. Shards refer to the servers
 that contain different parts of the data. You can deploy multiple shards to scale
 the cluster horizontally. Each shard consists of one or more replica hosts.