Validate AVConnect credentials on saving. Improved AVConnect login method. Fixed issue with UTC datetimes

src/routers/keypasses.py

@@ -7,6 +7,7 @@ from typing import Optional
 from fastapi import APIRouter, Depends, HTTPException
 from sqlalchemy.orm import Session
 
+from core.config import utcnow
 from core.database import Keypass, get_db
 from core.dependencies import require_manager
 from core.schemas import KeypassCreate, KeypassPatch, KeypassResponse, keypass_to_response
@@ -38,7 +39,7 @@ async def create_keypass(
     kp = Keypass(
         code=code,
         description=req.description,
-        created_at=datetime.now(timezone.utc),
+        created_at=utcnow(),
         expires_at=req.expires_at,
         revoked=False,
         allowed_gates=json.dumps(req.gate_ids) if req.gate_ids else None,
@@ -80,10 +81,10 @@ async def revoke_keypass(
     kp: Optional[Keypass] = db.query(Keypass).filter(Keypass.id == kp_id).first()
     if not kp:
         raise HTTPException(404, "Keypass not found")
-    if kp.expires_at is not None and kp.expires_at < datetime.now(timezone.utc):
+    if kp.expires_at is not None and kp.expires_at < utcnow():
         raise HTTPException(409, "Expired keypasses cannot be revoked")
     if kp.revoked:
         raise HTTPException(409, "Keypass is already revoked")
     kp.revoked = True
-    kp.revoked_at = datetime.now(timezone.utc)
+    kp.revoked_at = utcnow()
     db.commit()