We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
ValueError: Unknown format code 'X' for object of type 'str'
Sentry Issue: [SITE-25](https://sentry.io/organizations/python-discord/issues/3211854811/?referrer=github_integration)

```
ValueError: Unknown format code 'X' for object of type 'str'
(16 additional frame(s) were not displayed)
...
  File "django/template/defaulttags.py", line 211, in render
    nodelist.append(node.render_annotated(context))
  File "django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "django/template/base.py", line 988, in render
    output = self.filter_expression.resolve(context)
  File "django/template/base.py", line 698, in resolve
    new_obj = func(obj, *arg_vals)
  File "pydis_site/apps/staff/templatetags/deletedmessage_filters.py", line 15, in hex_colour
    colour = f"#{color:0>6X}"
```

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `pydis_site/apps/staff/templatetags/deletedmessage_filters.py`
Content:
```
1 from datetime import datetime
2 
3 from django import template
4 
5 register = template.Library()
6 
7 
8 @register.filter
9 def hex_colour(color: int) -> str:
10     """
11     Converts an integer representation of a colour to the RGB hex value.
12 
13     As we are using a Discord dark theme analogue, black colours are returned as white instead.
14     """
15     colour = f"#{color:0>6X}"
16     return colour if colour != "#000000" else "#FFFFFF"
17 
18 
19 @register.filter
20 def footer_datetime(timestamp: str) -> datetime:
21     """Takes an embed timestamp and returns a timezone-aware datetime object."""
22     return datetime.fromisoformat(timestamp)
23 
24 
25 @register.filter
26 def visible_newlines(text: str) -> str:
27     """Takes an embed timestamp and returns a timezone-aware datetime object."""
28     return text.replace("\n", " <span class='has-text-grey'>↵</span><br>")
29
```
--- 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/pydis_site/apps/staff/templatetags/deletedmessage_filters.py b/pydis_site/apps/staff/templatetags/deletedmessage_filters.py
--- a/pydis_site/apps/staff/templatetags/deletedmessage_filters.py
+++ b/pydis_site/apps/staff/templatetags/deletedmessage_filters.py
@@ -1,4 +1,5 @@
 from datetime import datetime
+from typing import Union
 
 from django import template
 
@@ -6,13 +7,16 @@
 
 
 @register.filter
-def hex_colour(color: int) -> str:
+def hex_colour(colour: Union[str, int]) -> str:
     """
-    Converts an integer representation of a colour to the RGB hex value.
+    Converts the given representation of a colour to its RGB hex string.
 
     As we are using a Discord dark theme analogue, black colours are returned as white instead.
     """
-    colour = f"#{color:0>6X}"
+    if isinstance(colour, str):
+        colour = colour if colour.startswith("#") else f"#{colour}"
+    else:
+        colour = f"#{colour:0>6X}"
     return colour if colour != "#000000" else "#FFFFFF"

{"golden_diff": "diff --git a/pydis_site/apps/staff/templatetags/deletedmessage_filters.py b/pydis_site/apps/staff/templatetags/deletedmessage_filters.py\n--- a/pydis_site/apps/staff/templatetags/deletedmessage_filters.py\n+++ b/pydis_site/apps/staff/templatetags/deletedmessage_filters.py\n@@ -1,4 +1,5 @@\n from datetime import datetime\n+from typing import Union\n \n from django import template\n \n@@ -6,13 +7,16 @@\n \n \n @register.filter\n-def hex_colour(color: int) -> str:\n+def hex_colour(colour: Union[str, int]) -> str:\n     \"\"\"\n-    Converts an integer representation of a colour to the RGB hex value.\n+    Converts the given representation of a colour to its RGB hex string.\n \n     As we are using a Discord dark theme analogue, black colours are returned as white instead.\n     \"\"\"\n-    colour = f\"#{color:0>6X}\"\n+    if isinstance(colour, str):\n+        colour = colour if colour.startswith(\"#\") else f\"#{colour}\"\n+    else:\n+        colour = f\"#{colour:0>6X}\"\n     return colour if colour != \"#000000\" else \"#FFFFFF\"\n", "issue": "ValueError: Unknown format code 'X' for object of type 'str'\nSentry Issue: [SITE-25](https://sentry.io/organizations/python-discord/issues/3211854811/?referrer=github_integration)\n\n```\nValueError: Unknown format code 'X' for object of type 'str'\n(16 additional frame(s) were not displayed)\n...\n  File \"django/template/defaulttags.py\", line 211, in render\n    nodelist.append(node.render_annotated(context))\n  File \"django/template/base.py\", line 905, in render_annotated\n    return self.render(context)\n  File \"django/template/base.py\", line 988, in render\n    output = self.filter_expression.resolve(context)\n  File \"django/template/base.py\", line 698, in resolve\n    new_obj = func(obj, *arg_vals)\n  File \"pydis_site/apps/staff/templatetags/deletedmessage_filters.py\", line 15, in hex_colour\n    colour = f\"#{color:0>6X}\"\n```\n", "before_files": [{"content": "from datetime import datetime\n\nfrom django import template\n\nregister = template.Library()\n\n\n@register.filter\ndef hex_colour(color: int) -> str:\n    \"\"\"\n    Converts an integer representation of a colour to the RGB hex value.\n\n    As we are using a Discord dark theme analogue, black colours are returned as white instead.\n    \"\"\"\n    colour = f\"#{color:0>6X}\"\n    return colour if colour != \"#000000\" else \"#FFFFFF\"\n\n\n@register.filter\ndef footer_datetime(timestamp: str) -> datetime:\n    \"\"\"Takes an embed timestamp and returns a timezone-aware datetime object.\"\"\"\n    return datetime.fromisoformat(timestamp)\n\n\n@register.filter\ndef visible_newlines(text: str) -> str:\n    \"\"\"Takes an embed timestamp and returns a timezone-aware datetime object.\"\"\"\n    return text.replace(\"\\n\", \" <span class='has-text-grey'>\u21b5</span><br>\")\n", "path": "pydis_site/apps/staff/templatetags/deletedmessage_filters.py"}], "after_files": [{"content": "from datetime import datetime\nfrom typing import Union\n\nfrom django import template\n\nregister = template.Library()\n\n\n@register.filter\ndef hex_colour(colour: Union[str, int]) -> str:\n    \"\"\"\n    Converts the given representation of a colour to its RGB hex string.\n\n    As we are using a Discord dark theme analogue, black colours are returned as white instead.\n    \"\"\"\n    if isinstance(colour, str):\n        colour = colour if colour.startswith(\"#\") else f\"#{colour}\"\n    else:\n        colour = f\"#{colour:0>6X}\"\n    return colour if colour != \"#000000\" else \"#FFFFFF\"\n\n\n@register.filter\ndef footer_datetime(timestamp: str) -> datetime:\n    \"\"\"Takes an embed timestamp and returns a timezone-aware datetime object.\"\"\"\n    return datetime.fromisoformat(timestamp)\n\n\n@register.filter\ndef visible_newlines(text: str) -> str:\n    \"\"\"Takes an embed timestamp and returns a timezone-aware datetime object.\"\"\"\n    return text.replace(\"\\n\", \" <span class='has-text-grey'>\u21b5</span><br>\")\n", "path": "pydis_site/apps/staff/templatetags/deletedmessage_filters.py"}]}