feat: always display country code in uppercase (model validates + oninput)

app/models.py

@@ -1,8 +1,8 @@
 import uuid
 from datetime import datetime, timezone
 
-from sqlalchemy import Column, DateTime, ForeignKey, Integer, String
-from sqlalchemy.orm import relationship
+from sqlalchemy import Column, DateTime, ForeignKey, Integer, String, event
+from sqlalchemy.orm import relationship, validates
 
 from app.database import Base
 
@@ -72,3 +72,7 @@ class Postcard(Base):
     updated_at = Column(DateTime, default=_utcnow, onupdate=_utcnow)
 
     profile = relationship("Profile", back_populates="postcards")
+
+    @validates("country")
+    def _upper_country(self, key, value):
+        return value.strip().upper() if value else None