feat: ensure deletion of custom fields and values when a board is deleted

backend/app/services/board_lifecycle.py

@@ -23,6 +23,7 @@ from app.models.board_webhooks import BoardWebhook
 from app.models.organization_board_access import OrganizationBoardAccess
 from app.models.organization_invite_board_access import OrganizationInviteBoardAccess
 from app.models.tag_assignments import TagAssignment
+from app.models.task_custom_fields import BoardTaskCustomField, TaskCustomFieldValue
 from app.models.task_dependencies import TaskDependency
 from app.models.task_fingerprints import TaskFingerprint
 from app.models.tasks import Task
@@ -84,6 +85,12 @@ async def delete_board(session: AsyncSession, *, board: Board) -> OkResponse:
             col(TagAssignment.task_id).in_(task_ids),
             commit=False,
         )
+        await crud.delete_where(
+            session,
+            TaskCustomFieldValue,
+            col(TaskCustomFieldValue.task_id).in_(task_ids),
+            commit=False,
+        )
     # Keep teardown ordered around FK/reference chains so dependent rows are gone
     # before deleting their parent task/agent/board records.
     await crud.delete_where(
@@ -129,6 +136,11 @@ async def delete_board(session: AsyncSession, *, board: Board) -> OkResponse:
         OrganizationInviteBoardAccess,
         col(OrganizationInviteBoardAccess.board_id) == board.id,
     )
+    await crud.delete_where(
+        session,
+        BoardTaskCustomField,
+        col(BoardTaskCustomField.board_id) == board.id,
+    )
 
     # Tasks reference agents and have dependent records.
     # Delete tasks before agents.