05/19 Enhance codes 2

app/models/shared_item.py

@@ -48,6 +48,15 @@ class SharedItem(db.Model):
 
     accepted = db.Column(db.Boolean, default=False, nullable=False)
     created_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc).replace(tzinfo=None), nullable=False)
+    # Optional expiry — NULL means the share never expires.
+    # Expired unaccepted shares are hidden from the inbox; accepted shares remain.
+    expires_at = db.Column(db.DateTime, nullable=True)
+
+    def is_expired(self) -> bool:
+        """Return True if the share has an expiry and it has passed."""
+        if not self.expires_at:
+            return False
+        return datetime.now(timezone.utc).replace(tzinfo=None) >= self.expires_at
 
     def to_dict(self):
         return {
@@ -64,4 +73,6 @@ class SharedItem(db.Model):
             'iv_name': self.iv_name,
             'accepted': self.accepted,
             'created_at': self.created_at.isoformat() if self.created_at else None,
+            'expires_at': self.expires_at.isoformat() if self.expires_at else None,
+            'is_expired': self.is_expired(),
         }