"""
Printing domain signals.

We use domain-level signals (instead of model post_save) to:
- keep semantics clean (only fire on business "create" flow)
- allow passing explicit actor (created_by / sender_label)
- keep integration (e.g. WeCom notify) in handlers
"""

from django.dispatch import Signal

# Fired when a PrintingOrder is created via business service.
# Payload:
# - instance: PrintingOrder
# - created_by: Django User (may be None)
printing_order_created = Signal()