diff --git a/crates/bili_sync/src/adapter/mod.rs b/crates/bili_sync/src/adapter/mod.rs
index 29250b6..25ba8ef 100644
--- a/crates/bili_sync/src/adapter/mod.rs
+++ b/crates/bili_sync/src/adapter/mod.rs
@@ -7,7 +7,6 @@ use std::pin::Pin;
 
 use anyhow::Result;
 use async_trait::async_trait;
-use bili_sync_migration::IntoIden;
 pub use collection::collection_from;
 pub use favorite::favorite_from;
 use futures::Stream;
@@ -32,18 +31,11 @@ pub async fn video_list_from<'a>(
     }
 }
 
-pub const fn unique_video_columns() -> impl IntoIterator<Item = impl IntoIden> {
-    [
-        bili_sync_entity::video::Column::CollectionId,
-        bili_sync_entity::video::Column::FavoriteId,
-        bili_sync_entity::video::Column::Bvid,
-    ]
-}
-
 #[async_trait]
 pub trait VideoListModel {
     /* 逻辑相关 */
 
+    /// 获取与视频列表关联的视频总数
     async fn video_count(&self, connection: &DatabaseConnection) -> Result<u64>;
 
     /// 获取未填充的视频
diff --git a/crates/bili_sync/src/utils/convert.rs b/crates/bili_sync/src/utils/convert.rs
index 98810ba..399936f 100644
--- a/crates/bili_sync/src/utils/convert.rs
+++ b/crates/bili_sync/src/utils/convert.rs
@@ -12,8 +12,9 @@ impl VideoInfo {
             Some(base_model) => base_model.into_active_model(),
             None => {
                 let mut tmp_model = bili_sync_entity::video::Model::default().into_active_model();
-                // 注意此处要把 id 设置成 NotSet，否则 id 会是 Unchanged(0)
+                // 注意此处要把 id 和 created_at 设置为 NotSet，方便在 sql 中忽略这些字段，交由数据库自动生成
                 tmp_model.id = NotSet;
+                tmp_model.created_at = NotSet;
                 tmp_model
             }
         };
diff --git a/crates/bili_sync/src/utils/model.rs b/crates/bili_sync/src/utils/model.rs
index cccf01c..039b971 100644
--- a/crates/bili_sync/src/utils/model.rs
+++ b/crates/bili_sync/src/utils/model.rs
@@ -4,7 +4,7 @@ use bili_sync_migration::OnConflict;
 use sea_orm::entity::prelude::*;
 use sea_orm::ActiveValue::Set;
 
-use crate::adapter::{unique_video_columns, VideoListModel};
+use crate::adapter::VideoListModel;
 use crate::bilibili::{PageInfo, VideoInfo};
 
 /// 尝试创建 Video Model，如果发生冲突则忽略
@@ -18,7 +18,8 @@ pub async fn create_videos(
         .map(|v| video_list_model.video_model_by_info(v, None))
         .collect::<Vec<_>>();
     video::Entity::insert_many(video_models)
-        .on_conflict(OnConflict::columns(unique_video_columns()).do_nothing().to_owned())
+        // 这里想表达的是 on 索引名，但 sea-orm 的 api 似乎只支持列名而不支持索引名，好在留空可以达到相同的目的
+        .on_conflict(OnConflict::new().do_nothing().to_owned())
         .do_nothing()
         .exec(connection)
         .await?;
diff --git a/crates/bili_sync_migration/src/m20240505_130850_add_collection.rs b/crates/bili_sync_migration/src/m20240505_130850_add_collection.rs
index c23646b..fd4f90b 100644
--- a/crates/bili_sync_migration/src/m20240505_130850_add_collection.rs
+++ b/crates/bili_sync_migration/src/m20240505_130850_add_collection.rs
@@ -87,18 +87,10 @@ impl MigrationTrait for Migration {
                     .to_owned(),
             )
             .await?;
-        manager
-            .create_index(
-                Index::create()
-                    .table(Video::Table)
-                    .name("idx_video_cid_fid_bvid")
-                    .col(Video::CollectionId)
-                    .col(Video::FavoriteId)
-                    .col(Video::Bvid)
-                    .unique()
-                    .to_owned(),
-            )
-            .await
+        // 在唯一索引中，NULL 不等于 NULL，所以需要使用 ifnull 函数排除空的情况
+        db.execute_unprepared("CREATE UNIQUE INDEX `idx_video_cid_fid_bvid` ON `video` (ifnull(`collection_id`, -1), ifnull(`favorite_id`, -1), `bvid`)")
+            .await?;
+        Ok(())
     }
 
     async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {