We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
User should be able to configure multiple databases in settings
**Problem**
<!-- Please provide a clear and concise description of the problem that this feature request is designed to solve.-->
Currently, the user can only configure one Mathesar database in the settings. They should be able to configure as many databases to connect to Mathesar as they want.

**Proposed solution**
<!-- A clear and concise description of your proposed solution or feature. -->
The user should be able to configure multiple databases in the `.env` file.

**Additional context**
<!-- Add any other context or screenshots about the feature request here.-->
We might want to use `python-decouple`'s [built in CSV helper](https://github.com/henriquebastos/python-decouple/#built-in-csv-helper) for this.

Ideally, the user would be able to associate the database key with the connection information directly using a tuple or something like that.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `config/settings.py`
Content:
```
1 """
2 Django settings for config project.
3 
4 Generated by 'django-admin startproject' using Django 3.1.7.
5 
6 For more information on this file, see
7 https://docs.djangoproject.com/en/3.1/topics/settings/
8 
9 For the full list of settings and their values, see
10 https://docs.djangoproject.com/en/3.1/ref/settings/
11 """
12 
13 import os
14 from pathlib import Path
15 
16 from decouple import Csv, config as decouple_config
17 from dj_database_url import parse as db_url
18 
19 # Build paths inside the project like this: BASE_DIR / 'subdir'.
20 BASE_DIR = Path(__file__).resolve().parent.parent
21 
22 # Application definition
23 
24 INSTALLED_APPS = [
25     "django.contrib.admin",
26     "django.contrib.auth",
27     "django.contrib.contenttypes",
28     "django.contrib.sessions",
29     "django.contrib.messages",
30     "django.contrib.staticfiles",
31     "rest_framework",
32     "django_filters",
33     "django_property_filter",
34     "mathesar",
35 ]
36 
37 MIDDLEWARE = [
38     "django.middleware.security.SecurityMiddleware",
39     "django.contrib.sessions.middleware.SessionMiddleware",
40     "django.middleware.common.CommonMiddleware",
41     "django.middleware.csrf.CsrfViewMiddleware",
42     "django.contrib.auth.middleware.AuthenticationMiddleware",
43     "django.contrib.messages.middleware.MessageMiddleware",
44     "django.middleware.clickjacking.XFrameOptionsMiddleware",
45 ]
46 
47 ROOT_URLCONF = "config.urls"
48 
49 TEMPLATES = [
50     {
51         "BACKEND": "django.template.backends.django.DjangoTemplates",
52         "DIRS": [],
53         "APP_DIRS": True,
54         "OPTIONS": {
55             "context_processors": [
56                 "config.context_processors.get_settings",
57                 "django.template.context_processors.debug",
58                 "django.template.context_processors.request",
59                 "django.contrib.auth.context_processors.auth",
60                 "django.contrib.messages.context_processors.messages",
61             ],
62         },
63     },
64 ]
65 
66 WSGI_APPLICATION = "config.wsgi.application"
67 
68 # Database
69 # https://docs.djangoproject.com/en/3.1/ref/settings/#databases
70 
71 # TODO: Add to documentation that database keys should not be than 128 characters.
72 DATABASES = {
73     decouple_config('DJANGO_DATABASE_KEY'): decouple_config('DJANGO_DATABASE_URL', cast=db_url),
74     decouple_config('MATHESAR_DATABASE_KEY'): decouple_config('MATHESAR_DATABASE_URL', cast=db_url)
75 }
76 
77 # pytest-django will create a new database named 'test_{DATABASES[table_db]['NAME']}'
78 # and use it for our API tests if we don't specify DATABASES[table_db]['TEST']['NAME']
79 if decouple_config('TEST', default=False, cast=bool):
80     DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['TEST'] = {
81         'NAME': DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['NAME']
82     }
83 
84 
85 # Quick-start development settings - unsuitable for production
86 # See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/
87 
88 # SECURITY WARNING: keep the secret key used in production secret!
89 SECRET_KEY = decouple_config('SECRET_KEY')
90 
91 # SECURITY WARNING: don't run with debug turned on in production!
92 DEBUG = decouple_config('DEBUG', default=False, cast=bool)
93 
94 ALLOWED_HOSTS = decouple_config('ALLOWED_HOSTS', cast=Csv())
95 
96 # Password validation
97 # https://docs.djangoproject.com/en/3.1/ref/settings/#auth-password-validators
98 
99 AUTH_PASSWORD_VALIDATORS = [
100     {
101         "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
102     },
103     {
104         "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
105     },
106     {
107         "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
108     },
109     {
110         "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
111     },
112 ]
113 
114 
115 # Internationalization
116 # https://docs.djangoproject.com/en/3.1/topics/i18n/
117 
118 LANGUAGE_CODE = "en-us"
119 
120 TIME_ZONE = "UTC"
121 
122 USE_I18N = True
123 
124 USE_L10N = True
125 
126 USE_TZ = True
127 
128 
129 # Static files (CSS, JavaScript, Images)
130 # https://docs.djangoproject.com/en/3.1/howto/static-files/
131 
132 STATIC_URL = "/static/"
133 
134 CLIENT_DEV_URL = "http://localhost:3000"
135 
136 
137 # Media files (uploaded by the user)
138 
139 MEDIA_ROOT = os.path.join(BASE_DIR, '.media/')
140 
141 MEDIA_URL = "/media/"
142
```
--- 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/config/settings.py b/config/settings.py
--- a/config/settings.py
+++ b/config/settings.py
@@ -16,6 +16,16 @@
 from decouple import Csv, config as decouple_config
 from dj_database_url import parse as db_url
 
+
+# We use a 'tuple' with pipes as delimiters as decople naively splits the global
+# variables on commas when casting to Csv()
+def pipe_delim(pipe_string):
+    # Remove opening and closing brackets
+    pipe_string = pipe_string[1:-1]
+    # Split on pipe delim
+    return pipe_string.split("|")
+
+
 # Build paths inside the project like this: BASE_DIR / 'subdir'.
 BASE_DIR = Path(__file__).resolve().parent.parent
 
@@ -69,17 +79,20 @@
 # https://docs.djangoproject.com/en/3.1/ref/settings/#databases
 
 # TODO: Add to documentation that database keys should not be than 128 characters.
+
+# MATHESAR_DATABASES should be of the form '({db_name}|{db_url}), ({db_name}|{db_url})'
+# See pipe_delim above for why we use pipes as delimiters
 DATABASES = {
-    decouple_config('DJANGO_DATABASE_KEY'): decouple_config('DJANGO_DATABASE_URL', cast=db_url),
-    decouple_config('MATHESAR_DATABASE_KEY'): decouple_config('MATHESAR_DATABASE_URL', cast=db_url)
+    db_key: db_url(url_string)
+    for db_key, url_string in decouple_config('MATHESAR_DATABASES', cast=Csv(pipe_delim))
 }
+DATABASES[decouple_config('DJANGO_DATABASE_KEY')] = decouple_config('DJANGO_DATABASE_URL', cast=db_url)
 
 # pytest-django will create a new database named 'test_{DATABASES[table_db]['NAME']}'
 # and use it for our API tests if we don't specify DATABASES[table_db]['TEST']['NAME']
 if decouple_config('TEST', default=False, cast=bool):
-    DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['TEST'] = {
-        'NAME': DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['NAME']
-    }
+    for db_key, _ in decouple_config('MATHESAR_DATABASES', cast=Csv(pipe_delim)):
+        DATABASES[db_key]['TEST'] = {'NAME': DATABASES[db_key]['NAME']}
 
 
 # Quick-start development settings - unsuitable for production

{"golden_diff": "diff --git a/config/settings.py b/config/settings.py\n--- a/config/settings.py\n+++ b/config/settings.py\n@@ -16,6 +16,16 @@\n from decouple import Csv, config as decouple_config\n from dj_database_url import parse as db_url\n \n+\n+# We use a 'tuple' with pipes as delimiters as decople naively splits the global\n+# variables on commas when casting to Csv()\n+def pipe_delim(pipe_string):\n+    # Remove opening and closing brackets\n+    pipe_string = pipe_string[1:-1]\n+    # Split on pipe delim\n+    return pipe_string.split(\"|\")\n+\n+\n # Build paths inside the project like this: BASE_DIR / 'subdir'.\n BASE_DIR = Path(__file__).resolve().parent.parent\n \n@@ -69,17 +79,20 @@\n # https://docs.djangoproject.com/en/3.1/ref/settings/#databases\n \n # TODO: Add to documentation that database keys should not be than 128 characters.\n+\n+# MATHESAR_DATABASES should be of the form '({db_name}|{db_url}), ({db_name}|{db_url})'\n+# See pipe_delim above for why we use pipes as delimiters\n DATABASES = {\n-    decouple_config('DJANGO_DATABASE_KEY'): decouple_config('DJANGO_DATABASE_URL', cast=db_url),\n-    decouple_config('MATHESAR_DATABASE_KEY'): decouple_config('MATHESAR_DATABASE_URL', cast=db_url)\n+    db_key: db_url(url_string)\n+    for db_key, url_string in decouple_config('MATHESAR_DATABASES', cast=Csv(pipe_delim))\n }\n+DATABASES[decouple_config('DJANGO_DATABASE_KEY')] = decouple_config('DJANGO_DATABASE_URL', cast=db_url)\n \n # pytest-django will create a new database named 'test_{DATABASES[table_db]['NAME']}'\n # and use it for our API tests if we don't specify DATABASES[table_db]['TEST']['NAME']\n if decouple_config('TEST', default=False, cast=bool):\n-    DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['TEST'] = {\n-        'NAME': DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['NAME']\n-    }\n+    for db_key, _ in decouple_config('MATHESAR_DATABASES', cast=Csv(pipe_delim)):\n+        DATABASES[db_key]['TEST'] = {'NAME': DATABASES[db_key]['NAME']}\n \n \n # Quick-start development settings - unsuitable for production\n", "issue": "User should be able to configure multiple databases in settings\n**Problem**\r\n<!-- Please provide a clear and concise description of the problem that this feature request is designed to solve.-->\r\nCurrently, the user can only configure one Mathesar database in the settings. They should be able to configure as many databases to connect to Mathesar as they want.\r\n\r\n**Proposed solution**\r\n<!-- A clear and concise description of your proposed solution or feature. -->\r\nThe user should be able to configure multiple databases in the `.env` file.\r\n\r\n**Additional context**\r\n<!-- Add any other context or screenshots about the feature request here.-->\r\nWe might want to use `python-decouple`'s [built in CSV helper](https://github.com/henriquebastos/python-decouple/#built-in-csv-helper) for this.\r\n\r\nIdeally, the user would be able to associate the database key with the connection information directly using a tuple or something like that.\n", "before_files": [{"content": "\"\"\"\nDjango settings for config project.\n\nGenerated by 'django-admin startproject' using Django 3.1.7.\n\nFor more information on this file, see\nhttps://docs.djangoproject.com/en/3.1/topics/settings/\n\nFor the full list of settings and their values, see\nhttps://docs.djangoproject.com/en/3.1/ref/settings/\n\"\"\"\n\nimport os\nfrom pathlib import Path\n\nfrom decouple import Csv, config as decouple_config\nfrom dj_database_url import parse as db_url\n\n# Build paths inside the project like this: BASE_DIR / 'subdir'.\nBASE_DIR = Path(__file__).resolve().parent.parent\n\n# Application definition\n\nINSTALLED_APPS = [\n    \"django.contrib.admin\",\n    \"django.contrib.auth\",\n    \"django.contrib.contenttypes\",\n    \"django.contrib.sessions\",\n    \"django.contrib.messages\",\n    \"django.contrib.staticfiles\",\n    \"rest_framework\",\n    \"django_filters\",\n    \"django_property_filter\",\n    \"mathesar\",\n]\n\nMIDDLEWARE = [\n    \"django.middleware.security.SecurityMiddleware\",\n    \"django.contrib.sessions.middleware.SessionMiddleware\",\n    \"django.middleware.common.CommonMiddleware\",\n    \"django.middleware.csrf.CsrfViewMiddleware\",\n    \"django.contrib.auth.middleware.AuthenticationMiddleware\",\n    \"django.contrib.messages.middleware.MessageMiddleware\",\n    \"django.middleware.clickjacking.XFrameOptionsMiddleware\",\n]\n\nROOT_URLCONF = \"config.urls\"\n\nTEMPLATES = [\n    {\n        \"BACKEND\": \"django.template.backends.django.DjangoTemplates\",\n        \"DIRS\": [],\n        \"APP_DIRS\": True,\n        \"OPTIONS\": {\n            \"context_processors\": [\n                \"config.context_processors.get_settings\",\n                \"django.template.context_processors.debug\",\n                \"django.template.context_processors.request\",\n                \"django.contrib.auth.context_processors.auth\",\n                \"django.contrib.messages.context_processors.messages\",\n            ],\n        },\n    },\n]\n\nWSGI_APPLICATION = \"config.wsgi.application\"\n\n# Database\n# https://docs.djangoproject.com/en/3.1/ref/settings/#databases\n\n# TODO: Add to documentation that database keys should not be than 128 characters.\nDATABASES = {\n    decouple_config('DJANGO_DATABASE_KEY'): decouple_config('DJANGO_DATABASE_URL', cast=db_url),\n    decouple_config('MATHESAR_DATABASE_KEY'): decouple_config('MATHESAR_DATABASE_URL', cast=db_url)\n}\n\n# pytest-django will create a new database named 'test_{DATABASES[table_db]['NAME']}'\n# and use it for our API tests if we don't specify DATABASES[table_db]['TEST']['NAME']\nif decouple_config('TEST', default=False, cast=bool):\n    DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['TEST'] = {\n        'NAME': DATABASES[decouple_config('MATHESAR_DATABASE_KEY')]['NAME']\n    }\n\n\n# Quick-start development settings - unsuitable for production\n# See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/\n\n# SECURITY WARNING: keep the secret key used in production secret!\nSECRET_KEY = decouple_config('SECRET_KEY')\n\n# SECURITY WARNING: don't run with debug turned on in production!\nDEBUG = decouple_config('DEBUG', default=False, cast=bool)\n\nALLOWED_HOSTS = decouple_config('ALLOWED_HOSTS', cast=Csv())\n\n# Password validation\n# https://docs.djangoproject.com/en/3.1/ref/settings/#auth-password-validators\n\nAUTH_PASSWORD_VALIDATORS = [\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.UserAttributeSimilarityValidator\",\n    },\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.MinimumLengthValidator\",\n    },\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.CommonPasswordValidator\",\n    },\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.NumericPasswordValidator\",\n    },\n]\n\n\n# Internationalization\n# https://docs.djangoproject.com/en/3.1/topics/i18n/\n\nLANGUAGE_CODE = \"en-us\"\n\nTIME_ZONE = \"UTC\"\n\nUSE_I18N = True\n\nUSE_L10N = True\n\nUSE_TZ = True\n\n\n# Static files (CSS, JavaScript, Images)\n# https://docs.djangoproject.com/en/3.1/howto/static-files/\n\nSTATIC_URL = \"/static/\"\n\nCLIENT_DEV_URL = \"http://localhost:3000\"\n\n\n# Media files (uploaded by the user)\n\nMEDIA_ROOT = os.path.join(BASE_DIR, '.media/')\n\nMEDIA_URL = \"/media/\"\n", "path": "config/settings.py"}], "after_files": [{"content": "\"\"\"\nDjango settings for config project.\n\nGenerated by 'django-admin startproject' using Django 3.1.7.\n\nFor more information on this file, see\nhttps://docs.djangoproject.com/en/3.1/topics/settings/\n\nFor the full list of settings and their values, see\nhttps://docs.djangoproject.com/en/3.1/ref/settings/\n\"\"\"\n\nimport os\nfrom pathlib import Path\n\nfrom decouple import Csv, config as decouple_config\nfrom dj_database_url import parse as db_url\n\n\n# We use a 'tuple' with pipes as delimiters as decople naively splits the global\n# variables on commas when casting to Csv()\ndef pipe_delim(pipe_string):\n    # Remove opening and closing brackets\n    pipe_string = pipe_string[1:-1]\n    # Split on pipe delim\n    return pipe_string.split(\"|\")\n\n\n# Build paths inside the project like this: BASE_DIR / 'subdir'.\nBASE_DIR = Path(__file__).resolve().parent.parent\n\n# Application definition\n\nINSTALLED_APPS = [\n    \"django.contrib.admin\",\n    \"django.contrib.auth\",\n    \"django.contrib.contenttypes\",\n    \"django.contrib.sessions\",\n    \"django.contrib.messages\",\n    \"django.contrib.staticfiles\",\n    \"rest_framework\",\n    \"django_filters\",\n    \"django_property_filter\",\n    \"mathesar\",\n]\n\nMIDDLEWARE = [\n    \"django.middleware.security.SecurityMiddleware\",\n    \"django.contrib.sessions.middleware.SessionMiddleware\",\n    \"django.middleware.common.CommonMiddleware\",\n    \"django.middleware.csrf.CsrfViewMiddleware\",\n    \"django.contrib.auth.middleware.AuthenticationMiddleware\",\n    \"django.contrib.messages.middleware.MessageMiddleware\",\n    \"django.middleware.clickjacking.XFrameOptionsMiddleware\",\n]\n\nROOT_URLCONF = \"config.urls\"\n\nTEMPLATES = [\n    {\n        \"BACKEND\": \"django.template.backends.django.DjangoTemplates\",\n        \"DIRS\": [],\n        \"APP_DIRS\": True,\n        \"OPTIONS\": {\n            \"context_processors\": [\n                \"config.context_processors.get_settings\",\n                \"django.template.context_processors.debug\",\n                \"django.template.context_processors.request\",\n                \"django.contrib.auth.context_processors.auth\",\n                \"django.contrib.messages.context_processors.messages\",\n            ],\n        },\n    },\n]\n\nWSGI_APPLICATION = \"config.wsgi.application\"\n\n# Database\n# https://docs.djangoproject.com/en/3.1/ref/settings/#databases\n\n# TODO: Add to documentation that database keys should not be than 128 characters.\n\n# MATHESAR_DATABASES should be of the form '({db_name}|{db_url}), ({db_name}|{db_url})'\n# See pipe_delim above for why we use pipes as delimiters\nDATABASES = {\n    db_key: db_url(url_string)\n    for db_key, url_string in decouple_config('MATHESAR_DATABASES', cast=Csv(pipe_delim))\n}\nDATABASES[decouple_config('DJANGO_DATABASE_KEY')] = decouple_config('DJANGO_DATABASE_URL', cast=db_url)\n\n# pytest-django will create a new database named 'test_{DATABASES[table_db]['NAME']}'\n# and use it for our API tests if we don't specify DATABASES[table_db]['TEST']['NAME']\nif decouple_config('TEST', default=False, cast=bool):\n    for db_key, _ in decouple_config('MATHESAR_DATABASES', cast=Csv(pipe_delim)):\n        DATABASES[db_key]['TEST'] = {'NAME': DATABASES[db_key]['NAME']}\n\n\n# Quick-start development settings - unsuitable for production\n# See https://docs.djangoproject.com/en/3.1/howto/deployment/checklist/\n\n# SECURITY WARNING: keep the secret key used in production secret!\nSECRET_KEY = decouple_config('SECRET_KEY')\n\n# SECURITY WARNING: don't run with debug turned on in production!\nDEBUG = decouple_config('DEBUG', default=False, cast=bool)\n\nALLOWED_HOSTS = decouple_config('ALLOWED_HOSTS', cast=Csv())\n\n# Password validation\n# https://docs.djangoproject.com/en/3.1/ref/settings/#auth-password-validators\n\nAUTH_PASSWORD_VALIDATORS = [\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.UserAttributeSimilarityValidator\",\n    },\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.MinimumLengthValidator\",\n    },\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.CommonPasswordValidator\",\n    },\n    {\n        \"NAME\": \"django.contrib.auth.password_validation.NumericPasswordValidator\",\n    },\n]\n\n\n# Internationalization\n# https://docs.djangoproject.com/en/3.1/topics/i18n/\n\nLANGUAGE_CODE = \"en-us\"\n\nTIME_ZONE = \"UTC\"\n\nUSE_I18N = True\n\nUSE_L10N = True\n\nUSE_TZ = True\n\n\n# Static files (CSS, JavaScript, Images)\n# https://docs.djangoproject.com/en/3.1/howto/static-files/\n\nSTATIC_URL = \"/static/\"\n\nCLIENT_DEV_URL = \"http://localhost:3000\"\n\n\n# Media files (uploaded by the user)\n\nMEDIA_ROOT = os.path.join(BASE_DIR, '.media/')\n\nMEDIA_URL = \"/media/\"\n", "path": "config/settings.py"}]}