refactor: finish transactional runtime migration

app/db/models/agenttaskrun.py

@@ -4,7 +4,7 @@ from sqlalchemy import Index, Integer, String, Text, delete, select, update
 from sqlalchemy.orm import Mapped, Session, mapped_column
 
 from app.db.base import Base, execute_dml, get_id_column
-from app.db.decorators import db_query, db_update
+from app.db.decorators import db_query
 from app.db.models.agenttask import AgentTask
 
 
@@ -41,7 +41,6 @@ class AgentTaskRun(Base):
     )
 
     @classmethod
-    @db_update
     def begin_run(
             cls,
             db: Session,
@@ -107,7 +106,6 @@ class AgentTaskRun(Base):
         return run_id
 
     @classmethod
-    @db_update
     def finish_run(
             cls,
             db: Session,
@@ -174,7 +172,6 @@ class AgentTaskRun(Base):
         return True
 
     @classmethod
-    @db_update
     def interrupt_task(
             cls,
             db: Session,
@@ -226,7 +223,6 @@ class AgentTaskRun(Base):
         ))
 
     @classmethod
-    @db_update
     def delete_task_and_runs(
             cls,
             db: Session,