diff --git a/plugin/db/clickhouse/clickhouse_migration_schema.sql b/plugin/db/clickhouse/clickhouse_migration_schema.sql
index a4813332b083eb..dd7e0f3a5dada5 100644
--- a/plugin/db/clickhouse/clickhouse_migration_schema.sql
+++ b/plugin/db/clickhouse/clickhouse_migration_schema.sql
@@ -20,11 +20,14 @@ CREATE TABLE bytebase.migration_history (
     -- Used to detect out of order migration together with 'namespace' and 'version' column.
     sequence INTEGER UNSIGNED NOT NULL,
     -- We call it engine because maybe we could load history from other migration tool.
-    `engine` ENUM('UI' = 0, 'VCS' = 1) NOT NULL,
-    `type` ENUM('BASELINE' = 0, 'MIGRATE' = 1, 'BRANCH' = 2, 'DATA' = 3) NOT NULL,
+    -- Current allowed values are UI, VCS.
+    `engine` TEXT NOT NULL,
+    -- Current allowed values are BASELINE, MIGRATE, BRANCH, DATA.
+    `type` TEXT NOT NULL,
+    -- Current allowed values are PENDING, DONE, FAILED.
     -- MySQL runs DDL in its own transaction, so we can't record DDL and migration_history into a single transaction.
     -- Thus, we create a "PENDING" record before applying the DDL and update that record to "DONE" after applying the DDL.
-    `status` ENUM('PENDING' = 0, 'DONE' = 1, 'FAILED' = 2) NOT NULL,
+    `status` TEXT NOT NULL,
     -- Record the migration version.
     version TEXT NOT NULL,
     description TEXT NOT NULL,
diff --git a/plugin/db/mysql/mysql_migration_schema.sql b/plugin/db/mysql/mysql_migration_schema.sql
index 32f0285d70ed1b..1f0f2ba12535a9 100644
--- a/plugin/db/mysql/mysql_migration_schema.sql
+++ b/plugin/db/mysql/mysql_migration_schema.sql
@@ -20,11 +20,14 @@ CREATE TABLE bytebase.migration_history (
     -- Used to detect out of order migration together with 'namespace' and 'version' column.
     sequence INTEGER UNSIGNED NOT NULL,
     -- We call it engine because maybe we could load history from other migration tool.
-    `engine` ENUM('UI', 'VCS') NOT NULL,
-    `type` ENUM('BASELINE', 'MIGRATE', 'BRANCH', 'DATA') NOT NULL,
+    -- Current allowed values are UI, VCS.
+    `engine` TEXT NOT NULL,
+    -- Current allowed values are BASELINE, MIGRATE, BRANCH, DATA.
+    `type` TEXT NOT NULL,
+    -- Current allowed values are PENDING, DONE, FAILED.
     -- MySQL runs DDL in its own transaction, so we can't record DDL and migration_history into a single transaction.
     -- Thus, we create a "PENDING" record before applying the DDL and update that record to "DONE" after applying the DDL.
-    `status` ENUM('PENDING', 'DONE', 'FAILED') NOT NULL,
+    `status` TEXT NOT NULL,
     -- Record the migration version.
     version TEXT NOT NULL,
     description TEXT NOT NULL,
diff --git a/plugin/db/pg/pg_migration_schema.sql b/plugin/db/pg/pg_migration_schema.sql
index 507179635008dc..d8509fe5ba5447 100644
--- a/plugin/db/pg/pg_migration_schema.sql
+++ b/plugin/db/pg/pg_migration_schema.sql
@@ -20,11 +20,14 @@ CREATE TABLE migration_history (
     -- Used to detect out of order migration together with 'namespace' and 'version' column.
     sequence INTEGER NOT NULL CHECK (sequence >= 0),
     -- We call it engine because maybe we could load history from other migration tool.
-    engine TEXT NOT NULL CHECK (engine in ('UI', 'VCS')),
-    type TEXT NOT NULL CHECK (type in ('BASELINE', 'MIGRATE', 'BRANCH', 'DATA')),
+    -- Current allowed values are UI, VCS.
+    engine TEXT NOT NULL,
+    -- Current allowed values are BASELINE, MIGRATE, BRANCH, DATA.
+    type TEXT NOT NULL,
+    -- Current allowed values are PENDING, DONE, FAILED.
     -- PostgreSQL can't do cross database transaction, so we can't record DDL and migration_history into a single transaction.
     -- Thus, we create a "PENDING" record before applying the DDL and update that record to "DONE" after applying the DDL.
-    status TEXT NOT NULL CHECK (status in ('PENDING', 'DONE', 'FAILED')),
+    status TEXT NOT NULL,
     -- Record the migration version.
     version TEXT NOT NULL,
     description TEXT NOT NULL,
diff --git a/plugin/db/snowflake/snowflake_migration_schema.sql b/plugin/db/snowflake/snowflake_migration_schema.sql
index 5e5ec307a77bbc..71ba7f531b8fa9 100644
--- a/plugin/db/snowflake/snowflake_migration_schema.sql
+++ b/plugin/db/snowflake/snowflake_migration_schema.sql
@@ -20,8 +20,11 @@ CREATE TABLE bytebase.public.migration_history (
     -- Used to detect out of order migration together with 'namespace' and 'version' column.
     sequence INTEGER NOT NULL,
     -- We call it engine because maybe we could load history from other migration tool.
+    -- Current allowed values are UI, VCS.
     engine TEXT NOT NULL,
+    -- Current allowed values are BASELINE, MIGRATE, BRANCH, DATA.
     type TEXT NOT NULL,
+    -- Current allowed values are PENDING, DONE, FAILED.
     -- Snowflake runs DDL in its own transaction, so we can't record DDL and migration_history into a single transaction.
     -- Thus, we create a "PENDING" record before applying the DDL and update that record to "DONE" after applying the DDL.
     status TEXT NOT NULL,