Fix error in event processing where the event is deleted before marking it as taken (#2280)

Co-authored-by: Carlos Quintana <74399022+cquintana92@users.noreply.github.com>

app/models.py

@@ -24,6 +24,7 @@ from sqlalchemy import text, desc, CheckConstraint, Index, Column
 from sqlalchemy.dialects.postgresql import TSVECTOR
 from sqlalchemy.ext.declarative import declarative_base
 from sqlalchemy.orm import deferred
+from sqlalchemy.orm.exc import ObjectDeletedError
 from sqlalchemy.sql import and_
 from sqlalchemy_utils import ArrowType
 
@@ -3781,6 +3782,7 @@ class SyncEvent(Base, ModelMixin):
     )
 
     def mark_as_taken(self, allow_taken_older_than: Optional[Arrow] = None) -> bool:
+        try:
             taken_condition = ["taken_time IS NULL"]
             args = {"taken_time": arrow.now().datetime, "sync_event_id": self.id}
             if allow_taken_older_than:
@@ -3790,6 +3792,8 @@ class SyncEvent(Base, ModelMixin):
             sql = f"UPDATE sync_event SET taken_time = :taken_time WHERE id = :sync_event_id AND {sql_taken_condition}"
             res = Session.execute(sql, args)
             Session.commit()
+        except ObjectDeletedError:
+            return False
 
         return res.rowcount > 0