prompt: 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()
  
  ```
  
golden_diff: 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
  
verification_info: {"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"}]}