diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/__init__.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/__init__.py
index 91a18c0..40c9986 100644
--- a/src/nonebot_plugin_mahjong_scoreboard/model/orm/__init__.py
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/__init__.py
@@ -1,10 +1 @@
-from nonebot import get_driver, require
-
-from nonebot_plugin_mahjong_scoreboard.config import conf
-
-require("nonebot_plugin_sqlalchemy")
-from nonebot_plugin_sqlalchemy import DataSource
-
-data_source = DataSource(get_driver(), conf.mahjong_scoreboard_database_conn_url)
-
-__all__ = ("data_source",)
+from ._data_source import data_source
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/__init__.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/__init__.py
new file mode 100644
index 0000000..81bf3c5
--- /dev/null
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/__init__.py
@@ -0,0 +1,5 @@
+from . import metainfo
+from . import migrations
+from .src import data_source, dialect
+
+__all__ = ("data_source", "dialect")
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/metainfo.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/metainfo.py
new file mode 100644
index 0000000..d82d1eb
--- /dev/null
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/metainfo.py
@@ -0,0 +1,55 @@
+from sqlalchemy import Column, String, JSON, inspect, select
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from .src import data_source
+
+APP_DB_VERSION = 2
+
+
+@data_source.registry.mapped
+class MetaInfoOrm:
+    __tablename__ = 'metainfo'
+
+    key: str = Column(String(64), primary_key=True)
+    value = Column(JSON)
+
+
+async def get_metainfo(key: str):
+    async with AsyncSession(data_source.engine) as session:
+        record = await session.get(MetaInfoOrm, key)
+        return record.value
+
+
+async def set_metainfo(key: str, value: any):
+    async with AsyncSession(data_source.engine) as session:
+        record = await session.get(MetaInfoOrm, key)
+        if record is None:
+            record = MetaInfoOrm(key=key, value=value)
+            session.add(record)
+
+        record.value = value
+        await session.commit()
+
+
+@data_source.on_engine_created
+async def initialize_metainfo():
+    async with data_source.engine.begin() as conn:
+        await conn.run_sync(lambda conn: MetaInfoOrm.__table__.create(conn, checkfirst=True))
+
+    async with data_source.engine.begin() as conn:
+        async with AsyncSession(data_source.engine, expire_on_commit=False) as session:
+            # 判断是否初次建库
+            blank_database = not await conn.run_sync(lambda conn: inspect(conn).has_table("games"))
+            if blank_database:
+                result = MetaInfoOrm(key="db_version", value=APP_DB_VERSION)
+                session.add(result)
+                await session.commit()
+            else:
+                stmt = select(MetaInfoOrm).where(MetaInfoOrm.key == "db_version")
+                result = (await session.execute(stmt)).scalar_one_or_none()
+                if result is None:
+                    result = MetaInfoOrm(key="db_version", value=1)
+                    session.add(result)
+                    await session.commit()
+
+        await conn.commit()
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/migrations/__init__.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/migrations/__init__.py
new file mode 100644
index 0000000..b32b522
--- /dev/null
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/migrations/__init__.py
@@ -0,0 +1,21 @@
+from nonebot import logger
+
+from .v1_to_v2 import migrate_v1_to_v2
+from ..metainfo import get_metainfo, APP_DB_VERSION, set_metainfo
+from ..src import data_source
+
+migrations = {
+    (1, 2): migrate_v1_to_v2
+}
+
+
+@data_source.on_ready
+async def do_migrate():
+    cur_db_version = await get_metainfo('db_version')
+    while cur_db_version < APP_DB_VERSION:
+        mig = migrations[cur_db_version, cur_db_version + 1]
+        await mig()
+        await set_metainfo('db_version', cur_db_version + 1)
+        logger.success(f"migrate database from version {cur_db_version} to version {cur_db_version + 1}")
+
+        cur_db_version += 1
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/migrations/v1_to_v2.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/migrations/v1_to_v2.py
new file mode 100644
index 0000000..fcff0f3
--- /dev/null
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/migrations/v1_to_v2.py
@@ -0,0 +1,8 @@
+from sqlalchemy import text
+
+from ..src import data_source
+
+
+async def migrate_v1_to_v2():
+    async with data_source.engine.begin() as conn:
+        await conn.execute(text("ALTER TABLE game_records ADD point_scale integer NOT NULL DEFAULT 0;"))
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/src.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/src.py
new file mode 100644
index 0000000..d9a8209
--- /dev/null
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/_data_source/src.py
@@ -0,0 +1,23 @@
+from urllib.parse import urlparse
+
+from nonebot import get_driver, require
+
+from nonebot_plugin_mahjong_scoreboard.config import conf
+
+require("nonebot_plugin_sqlalchemy")
+from nonebot_plugin_sqlalchemy import DataSource
+
+data_source = DataSource(get_driver(), conf.mahjong_scoreboard_database_conn_url)
+
+
+def _detect_dialect():
+    url = urlparse(conf.mahjong_scoreboard_database_conn_url)
+    if '+' in url.scheme:
+        return url.scheme.split('+')[0]
+    else:
+        return url.scheme
+
+
+dialect = _detect_dialect()
+
+__all__ = ("data_source", "dialect")
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/game.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/game.py
index 55660d5..52eedc9 100644
--- a/src/nonebot_plugin_mahjong_scoreboard/model/orm/game.py
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/game.py
@@ -5,7 +5,7 @@
 from sqlalchemy.orm import relationship
 
 from nonebot_plugin_mahjong_scoreboard.model.enums import Wind
-from . import data_source
+from ._data_source import data_source
 from ..enums import PlayerAndWind, GameState
 
 if TYPE_CHECKING:
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/group.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/group.py
index f7788fb..042c4a2 100644
--- a/src/nonebot_plugin_mahjong_scoreboard/model/orm/group.py
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/group.py
@@ -3,7 +3,7 @@
 from sqlalchemy import Column, Integer, BigInteger, ForeignKey, Index
 from sqlalchemy.orm import relationship
 
-from . import data_source
+from ._data_source import data_source
 
 if TYPE_CHECKING:
     from .season import SeasonOrm
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/season.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/season.py
index d523a28..b648103 100644
--- a/src/nonebot_plugin_mahjong_scoreboard/model/orm/season.py
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/season.py
@@ -5,7 +5,7 @@
 from sqlalchemy import Column, Integer, DateTime, String, Enum, ForeignKey, Boolean, Index
 from sqlalchemy.orm import relationship
 
-from . import data_source
+from ._data_source import data_source
 from .types.userdict import UserDict as SqlUserDict
 from ..enums import SeasonState, SeasonUserPointChangeType
 from ...utils.userdict import DictField
diff --git a/src/nonebot_plugin_mahjong_scoreboard/model/orm/user.py b/src/nonebot_plugin_mahjong_scoreboard/model/orm/user.py
index 8508382..81d1191 100644
--- a/src/nonebot_plugin_mahjong_scoreboard/model/orm/user.py
+++ b/src/nonebot_plugin_mahjong_scoreboard/model/orm/user.py
@@ -1,6 +1,6 @@
 from sqlalchemy import Column, BigInteger, Integer, Index
 
-from . import data_source
+from ._data_source import data_source
 
 
 @data_source.registry.mapped