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()

```

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

{"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"}]}