fixes and refactor

app/models/support.py

@@ -3,7 +3,7 @@ Support ticket models for help desk functionality
 """
 from sqlalchemy import Column, Integer, String, Text, DateTime, Boolean, ForeignKey, Enum
 from sqlalchemy.orm import relationship
-from datetime import datetime
+from datetime import datetime, timezone
 import enum
 
 from app.models.base import BaseModel
@@ -63,9 +63,9 @@ class SupportTicket(BaseModel):
     ip_address = Column(String(45))     # IP address
     
     # Timestamps
-    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
-    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
-    resolved_at = Column(DateTime)
+    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)
+    updated_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
+    resolved_at = Column(DateTime(timezone=True))
     
     # Admin assignment
     assigned_to = Column(Integer, ForeignKey("users.id"))
@@ -95,7 +95,7 @@ class TicketResponse(BaseModel):
     author_email = Column(String(100))  # For non-user responses
     
     # Timestamps
-    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), nullable=False)
     
     # Relationships
     ticket = relationship("SupportTicket", back_populates="responses")