pg get_updated_rows pulls all rows if cutoff_value is None

This is needed for db_sync upsert to work if the destination table
exists but is empty

parsons/databases/postgres/postgres.py

@@ -125,7 +125,6 @@ def get_updated_rows(
         sql = f"""
             SELECT *
             FROM {self.table}
-            WHERE "{updated_at_column}" > %s
         """
         parameters = []
 
@@ -138,6 +137,6 @@ def get_updated_rows(
 
         sql += f" OFFSET {offset}"
 
-        result = self.db.query(sql, parameters=[cutoff_value])
+        result = self.db.query(sql, parameters=parameters)
 
         return result