Optimize load of ERC20 addresses

- Closes #2301

safe_transaction_service/history/models.py

@@ -1764,6 +1764,22 @@ class SafeContractManager(models.Manager):
     def get_banned_safes(self) -> QuerySet[ChecksumAddress]:
         return self.filter(banned=True).values_list("address", flat=True)
 
+    def get_safes_as_bytes(
+        self, newer_than: Optional[datetime.datetime] = None
+    ) -> list[bytes]:
+        """
+        Calculating checksum for a lot of addresses can take a lot of time. With this method we can get
+        them as they are stored in the database, as bytes
+
+        :return: List of Safes as bytes
+        """
+        query = "SELECT address FROM history_safecontract"
+        if newer_than:
+            query += f" created >= {newer_than.isoformat()}"
+        with connection.cursor() as cursor:
+            cursor.execute(query)
+            return [address.tobytes() for (address,) in cursor.fetchall()]
+
 
 class SafeContract(models.Model):
     objects = SafeContractManager()