diff --git a/config/config.exs b/config/config.exs
index 244fe1e2e..e2cf1be6a 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -1,110 +1,112 @@
-# This file is responsible for configuring your application
-# and its dependencies with the aid of the Config module.
-#
-# This configuration file is loaded before any dependency and
-# is restricted to this project.
-import Config
-
-config :cadet, environment: Mix.env()
-
-# General application configuration
-config :cadet,
-  ecto_repos: [Cadet.Repo]
-
-config :elixir, :time_zone_database, Tzdata.TimeZoneDatabase
-
-# Scheduler, e.g. for CS1101S
-config :cadet, Cadet.Jobs.Scheduler,
-  timezone: "Asia/Singapore",
-  overlap: false,
-  jobs: [
-    # Grade assessments that close in the previous day at 00:01
-    {"1 0 * * *", {Cadet.Autograder.GradingJob, :grade_all_due_yesterday, []}},
-    # Compute contest leaderboard that close in the previous day at 00:01
-    {"1 0 * * *", {Cadet.Assessments, :update_final_contest_leaderboards, []}},
-    # Compute rolling leaderboard every 2 hours
-    {"0 */2 * * *", {Cadet.Assessments, :update_rolling_contest_leaderboards, []}}
-  ]
-
-# Configures the endpoint
-config :cadet, CadetWeb.Endpoint,
-  url: [host: "localhost"],
-  secret_key_base: "ueV6EWi+7MCMcJH/WZZVKPZbQxFix7tF1Xv9ajD4AN4jLowHbdUX33rmKWPvEEgz",
-  render_errors: [view: CadetWeb.ErrorView, accepts: ~w(json)],
-  pubsub_server: Cadet.PubSub
-
-# Set Phoenix JSON library
-config :phoenix, :json_library, Jason
-config :phoenix_swagger, json_library: Jason
-
-# Configures Elixir's Logger
-config :logger, :console,
-  format: "$time $metadata[$level] $message\n",
-  metadata: [:request_id]
-
-# Configure ExAWS
-config :ex_aws,
-  access_key_id: [{:system, "AWS_ACCESS_KEY_ID"}, {:awscli, "default", 30}, :instance_role],
-  secret_access_key: [
-    {:system, "AWS_SECRET_ACCESS_KEY"},
-    {:awscli, "default", 30},
-    :instance_role
-  ],
-  region: "ap-southeast-1",
-  s3: [
-    scheme: "https://",
-    host: "s3.ap-southeast-1.amazonaws.com",
-    region: "ap-southeast-1"
-  ]
-
-config :ex_aws, :hackney_opts, recv_timeout: 660_000
-
-# Configure Arc File Upload
-config :arc, virtual_host: true
-# Or uncomment below to use local storage
-# config :arc, storage: Arc.Storage.Local
-
-# Configures Sentry
-config :sentry,
-  included_environments: [:prod],
-  environment_name: Mix.env(),
-  enable_source_code_context: true,
-  root_source_code_path: File.cwd!(),
-  context_lines: 5
-
-# Configure Phoenix Swagger
-config :cadet, :phoenix_swagger,
-  swagger_files: %{
-    "priv/static/swagger.json" => [
-      router: CadetWeb.Router
-    ]
-  }
-
-# Configure GuardianDB
-config :guardian, Guardian.DB,
-  repo: Cadet.Repo,
-  # default
-  schema_name: "guardian_tokens",
-  # store all token types if not set
-  token_types: ["refresh"],
-  # default: 60 minute
-  sweep_interval: 180
-
-config :cadet, Oban,
-  repo: Cadet.Repo,
-  plugins: [
-    # keep
-    {Oban.Plugins.Pruner, max_age: 60},
-    {Oban.Plugins.Cron,
-     crontab: [
-       {"@daily", Cadet.Workers.NotificationWorker,
-        args: %{"notification_type" => "avenger_backlog"}}
-     ]}
-  ],
-  queues: [default: 10, notifications: 1]
-
-config :cadet, Cadet.Mailer, adapter: Bamboo.LocalAdapter
-
-# Import environment specific config. This must remain at the bottom
-# of this file so it overrides the configuration defined above.
-import_config "#{Mix.env()}.exs"
+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Config module.
+#
+# This configuration file is loaded before any dependency and
+# is restricted to this project.
+import Config
+
+config :cadet, environment: Mix.env()
+
+# General application configuration
+config :cadet,
+  ecto_repos: [Cadet.Repo]
+
+config :elixir, :time_zone_database, Tzdata.TimeZoneDatabase
+
+# Scheduler, e.g. for CS1101S
+config :cadet, Cadet.Jobs.Scheduler,
+  timezone: "Asia/Singapore",
+  overlap: false,
+  jobs: [
+    # Grade assessments that close in the previous day at 00:01
+    {"1 0 * * *", {Cadet.Autograder.GradingJob, :grade_all_due_yesterday, []}},
+    # Compute contest leaderboard that close in the previous day at 00:01
+    {"1 0 * * *", {Cadet.Assessments, :update_final_contest_leaderboards, []}},
+    # Compute rolling leaderboard every 2 hours
+    {"0 */2 * * *", {Cadet.Assessments, :update_rolling_contest_leaderboards, []}},
+    # Collate contest entries that close in the previous day at 00:01
+    {"1 0 * * *", {Cadet.Assessments, :update_final_contest_entries, []}}
+  ]
+
+# Configures the endpoint
+config :cadet, CadetWeb.Endpoint,
+  url: [host: "localhost"],
+  secret_key_base: "ueV6EWi+7MCMcJH/WZZVKPZbQxFix7tF1Xv9ajD4AN4jLowHbdUX33rmKWPvEEgz",
+  render_errors: [view: CadetWeb.ErrorView, accepts: ~w(json)],
+  pubsub_server: Cadet.PubSub
+
+# Set Phoenix JSON library
+config :phoenix, :json_library, Jason
+config :phoenix_swagger, json_library: Jason
+
+# Configures Elixir's Logger
+config :logger, :console,
+  format: "$time $metadata[$level] $message\n",
+  metadata: [:request_id]
+
+# Configure ExAWS
+config :ex_aws,
+  access_key_id: [{:system, "AWS_ACCESS_KEY_ID"}, {:awscli, "default", 30}, :instance_role],
+  secret_access_key: [
+    {:system, "AWS_SECRET_ACCESS_KEY"},
+    {:awscli, "default", 30},
+    :instance_role
+  ],
+  region: "ap-southeast-1",
+  s3: [
+    scheme: "https://",
+    host: "s3.ap-southeast-1.amazonaws.com",
+    region: "ap-southeast-1"
+  ]
+
+config :ex_aws, :hackney_opts, recv_timeout: 660_000
+
+# Configure Arc File Upload
+config :arc, virtual_host: true
+# Or uncomment below to use local storage
+# config :arc, storage: Arc.Storage.Local
+
+# Configures Sentry
+config :sentry,
+  included_environments: [:prod],
+  environment_name: Mix.env(),
+  enable_source_code_context: true,
+  root_source_code_path: File.cwd!(),
+  context_lines: 5
+
+# Configure Phoenix Swagger
+config :cadet, :phoenix_swagger,
+  swagger_files: %{
+    "priv/static/swagger.json" => [
+      router: CadetWeb.Router
+    ]
+  }
+
+# Configure GuardianDB
+config :guardian, Guardian.DB,
+  repo: Cadet.Repo,
+  # default
+  schema_name: "guardian_tokens",
+  # store all token types if not set
+  token_types: ["refresh"],
+  # default: 60 minute
+  sweep_interval: 180
+
+config :cadet, Oban,
+  repo: Cadet.Repo,
+  plugins: [
+    # keep
+    {Oban.Plugins.Pruner, max_age: 60},
+    {Oban.Plugins.Cron,
+     crontab: [
+       {"@daily", Cadet.Workers.NotificationWorker,
+        args: %{"notification_type" => "avenger_backlog"}}
+     ]}
+  ],
+  queues: [default: 10, notifications: 1]
+
+config :cadet, Cadet.Mailer, adapter: Bamboo.LocalAdapter
+
+# Import environment specific config. This must remain at the bottom
+# of this file so it overrides the configuration defined above.
+import_config "#{Mix.env()}.exs"