feat: submission confirmation and payment locking

claims/models.py

@@ -58,6 +58,14 @@ class Claim(models.Model):
     )
     status = models.CharField(max_length=20, choices=Status.choices, default=Status.PENDING)
     decision_note = models.TextField(blank=True)
+    paid_at = models.DateTimeField(null=True, blank=True)
+    paid_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        blank=True,
+        on_delete=models.SET_NULL,
+        related_name="claims_marked_paid",
+    )
     created_at = models.DateTimeField(auto_now_add=True)
     updated_at = models.DateTimeField(auto_now=True)
 
@@ -68,6 +76,10 @@ class Claim(models.Model):
         project = f" [{self.project}]" if self.project else ""
         return f"{self.full_name} – {self.amount} {self.currency}{project} ({self.get_status_display()})"
 
+    @property
+    def is_paid(self):
+        return self.paid_at is not None
+
     def add_log(self, *, action, performed_by=None, from_status=None, to_status=None, note=""):
         return ClaimLog.objects.create(
             claim=self,
@@ -83,6 +95,7 @@ class ClaimLog(models.Model):
     class Action(models.TextChoices):
         CREATED = "created", _("Submitted")
         STATUS_CHANGED = "status_changed", _("Status changed")
+        MARKED_PAID = "marked_paid", _("Marked as paid")
 
     claim = models.ForeignKey(Claim, related_name="logs", on_delete=models.CASCADE)
     action = models.CharField(max_length=32, choices=Action.choices)
@@ -108,3 +121,24 @@ class ClaimLog(models.Model):
 
     def __str__(self):
         return f"{self.get_action_display()} ({self.created_at:%Y-%m-%d %H:%M})"
+
+
+class SystemSetting(models.Model):
+    internal_payments_enabled = models.BooleanField(default=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    class Meta:
+        verbose_name = "Systeminställning"
+        verbose_name_plural = "Systeminställningar"
+
+    def __str__(self):
+        return "Systeminställningar"
+
+    @classmethod
+    def get_solo(cls):
+        obj, _ = cls.objects.get_or_create(pk=1)
+        return obj
+
+    @classmethod
+    def internal_payments_active(cls):
+        return cls.get_solo().internal_payments_enabled