diff --git a/nonebot_bison/bootstrap.py b/nonebot_bison/bootstrap.py
index d8f9e63..c79b420 100644
--- a/nonebot_bison/bootstrap.py
+++ b/nonebot_bison/bootstrap.py
@@ -3,7 +3,7 @@ from nonebot_plugin_datastore.db import get_engine, post_db_init, pre_db_init
 from sqlalchemy import inspect, text
 
 from .config.config_legacy import start_up as legacy_db_startup
-from .config.db import data_migrate
+from .config.db_migration import data_migrate
 from .scheduler.manager import init_scheduler
 
 
diff --git a/nonebot_bison/config/db_config.py b/nonebot_bison/config/db_config.py
index 4ee9fec..7f43416 100644
--- a/nonebot_bison/config/db_config.py
+++ b/nonebot_bison/config/db_config.py
@@ -89,7 +89,7 @@ class DBConfig:
                 select(Subscribe)
                 .where(User.type == user_type, User.uid == user)
                 .join(User)
-                .options(selectinload(Subscribe.target))  # type:ignore
+                .options(selectinload(Subscribe.target))
             )
             subs = (await session.scalars(query_stmt)).all()
             return subs
diff --git a/nonebot_bison/config/db.py b/nonebot_bison/config/db_migration.py
similarity index 95%
rename from nonebot_bison/config/db.py
rename to nonebot_bison/config/db_migration.py
index e305927..08af455 100644
--- a/nonebot_bison/config/db.py
+++ b/nonebot_bison/config/db_migration.py
@@ -11,7 +11,10 @@ async def data_migrate():
     if config.available:
         logger.warning("You are still using legacy db, migrating to sqlite")
         all_subs: list[ConfigContent] = list(
-            map(lambda item: ConfigContent(**item), config.get_all_subscribe().all())
+            map(
+                lambda item: ConfigContent(**item),
+                config.get_all_subscribe().all(),
+            )
         )
         async with AsyncSession(get_engine()) as sess:
             user_to_create = []
diff --git a/nonebot_bison/config/db_model.py b/nonebot_bison/config/db_model.py
index f41db78..73f91fc 100644
--- a/nonebot_bison/config/db_model.py
+++ b/nonebot_bison/config/db_model.py
@@ -30,7 +30,7 @@ class Target(Model):
     platform_name: Mapped[str] = mapped_column(String(20))
     target: Mapped[str] = mapped_column(String(1024))
     target_name: Mapped[str] = mapped_column(String(1024))
-    default_schedule_weight: Mapped[int | None] = mapped_column(default=10)
+    default_schedule_weight: Mapped[int] = mapped_column(default=10)
 
     subscribes: Mapped[list["Subscribe"]] = relationship(back_populates="target")
     time_weight: Mapped[list["ScheduleTimeWeight"]] = relationship(
@@ -40,10 +40,10 @@ class Target(Model):
 
 class ScheduleTimeWeight(Model):
     id: Mapped[int] = mapped_column(primary_key=True)
-    target_id: Mapped[int | None] = mapped_column(ForeignKey("nonebot_bison_target.id"))
-    start_time: Mapped[datetime.time | None]
-    end_time: Mapped[datetime.time | None]
-    weight: Mapped[int | None]
+    target_id: Mapped[int] = mapped_column(ForeignKey("nonebot_bison_target.id"))
+    start_time: Mapped[datetime.time]
+    end_time: Mapped[datetime.time]
+    weight: Mapped[int]
 
     target: Mapped[Target] = relationship(back_populates="time_weight")
 
@@ -57,8 +57,8 @@ class Subscribe(Model):
     )
 
     id: Mapped[int] = mapped_column(primary_key=True)
-    target_id: Mapped[int | None] = mapped_column(ForeignKey("nonebot_bison_target.id"))
-    user_id: Mapped[int | None] = mapped_column(ForeignKey("nonebot_bison_user.id"))
+    target_id: Mapped[int] = mapped_column(ForeignKey("nonebot_bison_target.id"))
+    user_id: Mapped[int] = mapped_column(ForeignKey("nonebot_bison_user.id"))
     categories: Mapped[list[Category]] = mapped_column(JSON)
     tags: Mapped[list[Tag]] = mapped_column(JSON)