feat: add last_synced_at field to ProjectModel

Track when each project was last synced from Filevine for incremental sync strategies.

models/project_model.py

@@ -71,7 +71,8 @@ class ProjectModel:
                  project_url: str = "",
                  property_contacts: Dict[str, Any] = None,
                   viewing_emails: List[str] = None,
-                 viewing_domains: List[str] = None
+                  viewing_domains: List[str] = None,
+                  last_synced_at: str = ""
                   ):
         
         self.client = client
@@ -131,6 +132,7 @@ class ProjectModel:
         self.property_contacts = property_contacts or {}
         self.viewing_emails = viewing_emails or []
         self.viewing_domains = viewing_domains or []
+        self.last_synced_at = last_synced_at
     
     def to_dict(self) -> Dict[str, Any]:
         """Convert the ProjectModel to a dictionary for Firestore storage."""
@@ -191,7 +193,8 @@ class ProjectModel:
             "ProjectUrl": self.project_url,
             "property_contacts": self.property_contacts,
             "viewing_emails": self.viewing_emails,
-            "viewing_domains": self.viewing_domains
+            "viewing_domains": self.viewing_domains,
+            "last_synced_at": self.last_synced_at
         }
     
     @classmethod
@@ -254,5 +257,6 @@ class ProjectModel:
             project_url=data.get("ProjectUrl", ""),
             property_contacts=data.get("property_contacts", {}),
             viewing_emails=data.get("viewing_emails", []),
-            viewing_domains=data.get("viewing_domains", [])
+            viewing_domains=data.get("viewing_domains", []),
+            last_synced_at=data.get("last_synced_at", "")
         )