refactor: update migration paths and improve database operation handling

backend/app/services/task_dependencies.py

@@ -10,6 +10,7 @@ from sqlalchemy import delete
 from sqlmodel import col, select
 from sqlmodel.ext.asyncio.session import AsyncSession
 
+from app.db.sqlmodel_exec import exec_dml
 from app.models.task_dependencies import TaskDependency
 from app.models.tasks import Task
 
@@ -194,10 +195,11 @@ async def replace_task_dependencies(
         task_id=task_id,
         depends_on_task_ids=depends_on_task_ids,
     )
-    await session.execute(
+    await exec_dml(
+        session,
         delete(TaskDependency)
         .where(col(TaskDependency.board_id) == board_id)
-        .where(col(TaskDependency.task_id) == task_id)
+        .where(col(TaskDependency.task_id) == task_id),
     )
     for dep_id in normalized:
         session.add(