feat: Funcion de sistema tenants

backend/app/models/refresh_token.py

@@ -6,12 +6,11 @@ Modelo para persistencia de refresh tokens con revocaci├│n y tracking.
 
 from sqlalchemy import String, Boolean, DateTime, ForeignKey, Index, Integer
 from sqlalchemy.orm import Mapped, mapped_column, relationship
-from sqlalchemy.dialects.postgresql import UUID
 from typing import Optional, TYPE_CHECKING
 import uuid
-from datetime import datetime
+from datetime import datetime, timezone
 
-from app.core.database import Base
+from app.core.database import Base, GUID
 
 if TYPE_CHECKING:
     from app.models.user import User
@@ -36,7 +35,7 @@ class RefreshToken(Base):
     
     # User relationship
     user_id: Mapped[uuid.UUID] = mapped_column(
-        UUID(as_uuid=True),
+        GUID(),
         ForeignKey("users.id", ondelete="CASCADE"),
         nullable=False,
         index=True
@@ -92,7 +91,7 @@ class RefreshToken(Base):
     )
     
     revoked_by: Mapped[Optional[uuid.UUID]] = mapped_column(
-        UUID(as_uuid=True),
+        GUID(),
         ForeignKey("users.id", ondelete="SET NULL"),
         nullable=True
     )
@@ -146,12 +145,12 @@ class RefreshToken(Base):
         - No está revocado
         - No ha expirado
         """
-        return not self.revoked and self.expires_at > datetime.utcnow()
+        return not self.revoked and self.expires_at > datetime.now(timezone.utc)
     
     @property
     def is_expired(self) -> bool:
         """Verificar si el token ha expirado."""
-        return datetime.utcnow() >= self.expires_at
+        return datetime.now(timezone.utc) >= self.expires_at
     
     def revoke(self, revoked_by: Optional[uuid.UUID] = None) -> None:
         """
@@ -161,11 +160,11 @@ class RefreshToken(Base):
             revoked_by: ID del usuario que revoc├│ el token
         """
         self.revoked = True
-        self.revoked_at = datetime.utcnow()
+        self.revoked_at = datetime.now(timezone.utc)
         if revoked_by:
             self.revoked_by = revoked_by
     
     def track_usage(self) -> None:
         """Registrar uso del token."""
-        self.last_used_at = datetime.utcnow()
+        self.last_used_at = datetime.now(timezone.utc)
         self.usage_count += 1