User loses permission AFTER subscribing

[httpsVishu]

hey, i was going through projects/services/subscriptions.py and noticed something that might lead to inconsistent subscription state over time
found that in follow_all_project_questions and related flows, we create PostSubscription entries based on the posts a user currently has access to

posts = (
    Post.objects.filter_projects(project)
    .filter_permission(user=user)
    .filter_questions()
)

but if a user later loses access to the project, their existing PostSubscription records are not cleaned up and still remain in the db

i see that in some places (like notifications) we re-check permissions

subscriptions.filter(
    user__in=post.default_project.get_users_for_permission(
        ObjectPermission.VIEWER
    )
)

so it looks like the system relies on checking permissions at read/notification time rather than ensuring that the underlying data (subscriptions) stays consistent with access control

am curious to know whether this was intentional or was it more of a system design oversight where subscriptions should be cleaned up when access changes?