fix error in gitignore

apps/orders/models.py

@@ -0,0 +1,62 @@
+from django.db import models
+from django.utils import timezone
+
+from apps.core.models import TimeStampedModel, UUIDModel
+
+
+def generate_order_number() -> str:
+    year = timezone.now().year
+    prefix = f"STN-{year}-"
+    last = (
+        ProcessingOrder.objects.filter(order_number__startswith=prefix)
+        .order_by("-order_number")
+        .first()
+    )
+    if last:
+        try:
+            seq = int(last.order_number.rsplit("-", 1)[1]) + 1
+        except (IndexError, ValueError):
+            seq = 1
+    else:
+        seq = 1
+    return f"{prefix}{seq:06d}"
+
+
+class ProcessingOrder(UUIDModel, TimeStampedModel):
+    class Status(models.TextChoices):
+        DRAFT = "draft", "Draft"
+        AWAITING_CONFIRMATION = "awaiting_confirmation", "Awaiting confirmation"
+        CONFIRMED = "confirmed", "Confirmed"
+        PROCESSING = "processing", "Processing"
+        COMPLETED = "completed", "Completed"
+        CANCELLED = "cancelled", "Cancelled"
+
+    order_number = models.CharField(max_length=32, unique=True, blank=True)
+    customer = models.ForeignKey("accounts.Customer", on_delete=models.PROTECT, related_name="orders")
+    reservation = models.OneToOneField(
+        "reservations.Reservation", null=True, blank=True, on_delete=models.SET_NULL, related_name="order"
+    )
+    # Workflow version is immutable per order — historical orders never change.
+    workflow_version = models.ForeignKey(
+        "workflows.WorkflowVersion", on_delete=models.PROTECT, related_name="orders"
+    )
+    gross_weight_kg = models.DecimalField(max_digits=12, decimal_places=2, null=True, blank=True)
+    tare_weight_kg = models.DecimalField(max_digits=12, decimal_places=2, null=True, blank=True)
+    net_weight_kg = models.DecimalField(max_digits=12, decimal_places=2, null=True, blank=True)
+    selected_step_keys = models.JSONField(default=list, blank=True)
+    price_snapshot = models.JSONField(default=dict, blank=True)
+    currency = models.CharField(max_length=8, default="IRR")
+    status = models.CharField(max_length=24, choices=Status.choices, default=Status.DRAFT)
+    confirmed_at = models.DateTimeField(null=True, blank=True)
+    terms_accepted = models.BooleanField(default=False)
+
+    class Meta:
+        ordering = ["-created_at"]
+
+    def save(self, *args, **kwargs):
+        if not self.order_number:
+            self.order_number = generate_order_number()
+        super().save(*args, **kwargs)
+
+    def __str__(self) -> str:
+        return self.order_number or str(self.id)