prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  [BUG] could not serialize access due to concurrent update
  could not serialize access due to concurrent update
  
  and just crash....
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `InvenTree/InvenTree/exchange.py`
  Content:
  ```
  1 from common.settings import currency_code_default, currency_codes
  2 from urllib.error import HTTPError, URLError
  3 
  4 from djmoney.contrib.exchange.backends.base import SimpleExchangeBackend
  5 
  6 
  7 class InvenTreeExchange(SimpleExchangeBackend):
  8     """
  9     Backend for automatically updating currency exchange rates.
  10 
  11     Uses the exchangerate.host service API
  12     """
  13 
  14     name = "InvenTreeExchange"
  15 
  16     def __init__(self):
  17         self.url = "https://api.exchangerate.host/latest"
  18 
  19         super().__init__()
  20 
  21     def get_params(self):
  22         # No API key is required
  23         return {
  24         }
  25 
  26     def update_rates(self, base_currency=currency_code_default()):
  27 
  28         symbols = ','.join(currency_codes())
  29 
  30         try:
  31             super().update_rates(base=base_currency, symbols=symbols)
  32         # catch connection errors
  33         except (HTTPError, URLError):
  34             print('Encountered connection error while updating')
  35
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/InvenTree/InvenTree/exchange.py b/InvenTree/InvenTree/exchange.py
  --- a/InvenTree/InvenTree/exchange.py
  +++ b/InvenTree/InvenTree/exchange.py
  @@ -2,6 +2,7 @@
   from urllib.error import HTTPError, URLError
   
   from djmoney.contrib.exchange.backends.base import SimpleExchangeBackend
  +from django.db.utils import OperationalError
   
   
   class InvenTreeExchange(SimpleExchangeBackend):
  @@ -32,3 +33,12 @@
           # catch connection errors
           except (HTTPError, URLError):
               print('Encountered connection error while updating')
  +        except OperationalError as e:
  +            if 'SerializationFailure' in e.__cause__.__class__.__name__:
  +                print('Serialization Failure while updating exchange rates')
  +                # We are just going to swallow this exception because the
  +                # exchange rates will be updated later by the scheduled task
  +            else:
  +                # Other operational errors probably are still show stoppers
  +                # so reraise them so that the log contains the stacktrace
  +                raise
  
verification_info: {"golden_diff": "diff --git a/InvenTree/InvenTree/exchange.py b/InvenTree/InvenTree/exchange.py\n--- a/InvenTree/InvenTree/exchange.py\n+++ b/InvenTree/InvenTree/exchange.py\n@@ -2,6 +2,7 @@\n from urllib.error import HTTPError, URLError\n \n from djmoney.contrib.exchange.backends.base import SimpleExchangeBackend\n+from django.db.utils import OperationalError\n \n \n class InvenTreeExchange(SimpleExchangeBackend):\n@@ -32,3 +33,12 @@\n         # catch connection errors\n         except (HTTPError, URLError):\n             print('Encountered connection error while updating')\n+        except OperationalError as e:\n+            if 'SerializationFailure' in e.__cause__.__class__.__name__:\n+                print('Serialization Failure while updating exchange rates')\n+                # We are just going to swallow this exception because the\n+                # exchange rates will be updated later by the scheduled task\n+            else:\n+                # Other operational errors probably are still show stoppers\n+                # so reraise them so that the log contains the stacktrace\n+                raise\n", "issue": "[BUG] could not serialize access due to concurrent update\ncould not serialize access due to concurrent update\r\n\r\nand just crash....\n", "before_files": [{"content": "from common.settings import currency_code_default, currency_codes\nfrom urllib.error import HTTPError, URLError\n\nfrom djmoney.contrib.exchange.backends.base import SimpleExchangeBackend\n\n\nclass InvenTreeExchange(SimpleExchangeBackend):\n    \"\"\"\n    Backend for automatically updating currency exchange rates.\n\n    Uses the exchangerate.host service API\n    \"\"\"\n\n    name = \"InvenTreeExchange\"\n\n    def __init__(self):\n        self.url = \"https://api.exchangerate.host/latest\"\n\n        super().__init__()\n\n    def get_params(self):\n        # No API key is required\n        return {\n        }\n\n    def update_rates(self, base_currency=currency_code_default()):\n\n        symbols = ','.join(currency_codes())\n\n        try:\n            super().update_rates(base=base_currency, symbols=symbols)\n        # catch connection errors\n        except (HTTPError, URLError):\n            print('Encountered connection error while updating')\n", "path": "InvenTree/InvenTree/exchange.py"}], "after_files": [{"content": "from common.settings import currency_code_default, currency_codes\nfrom urllib.error import HTTPError, URLError\n\nfrom djmoney.contrib.exchange.backends.base import SimpleExchangeBackend\nfrom django.db.utils import OperationalError\n\n\nclass InvenTreeExchange(SimpleExchangeBackend):\n    \"\"\"\n    Backend for automatically updating currency exchange rates.\n\n    Uses the exchangerate.host service API\n    \"\"\"\n\n    name = \"InvenTreeExchange\"\n\n    def __init__(self):\n        self.url = \"https://api.exchangerate.host/latest\"\n\n        super().__init__()\n\n    def get_params(self):\n        # No API key is required\n        return {\n        }\n\n    def update_rates(self, base_currency=currency_code_default()):\n\n        symbols = ','.join(currency_codes())\n\n        try:\n            super().update_rates(base=base_currency, symbols=symbols)\n        # catch connection errors\n        except (HTTPError, URLError):\n            print('Encountered connection error while updating')\n        except OperationalError as e:\n            if 'SerializationFailure' in e.__cause__.__class__.__name__:\n                print('Serialization Failure while updating exchange rates')\n                # We are just going to swallow this exception because the\n                # exchange rates will be updated later by the scheduled task\n            else:\n                # Other operational errors probably are still show stoppers\n                # so reraise them so that the log contains the stacktrace\n                raise\n", "path": "InvenTree/InvenTree/exchange.py"}]}