Install Oban with dedicated repo

config/config.exs

@@ -12,7 +12,7 @@ config :elixir, :time_zone_database, TimeZoneInfo.TimeZoneDatabase
 config :time_zone_info, update: :daily
 
 config :music_library,
-  ecto_repos: [MusicLibrary.Repo, MusicLibrary.ErrorRepo],
+  ecto_repos: [MusicLibrary.BackgroundRepo, MusicLibrary.Repo, MusicLibrary.ErrorRepo],
   generators: [timestamp_type: :utc_datetime, binary_id: true]
 
 config :music_library, MusicLibraryWeb,
@@ -76,8 +76,15 @@ config :error_tracker,
   otp_app: :music_library,
   enabled: true
 
+config :music_library, Oban,
+  engine: Oban.Engines.Lite,
+  queues: [default: 10],
+  repo: MusicLibrary.BackgroundRepo
+
 config :music_library, MusicLibrary.ErrorRepo, priv: "priv/error_repo"
 
+config :music_library, MusicLibrary.BackgroundRepo, priv: "priv/background_repo"
+
 # Import environment specific config. This must remain at the bottom
 # of this file so it overrides the configuration defined above.
 import_config "#{config_env()}.exs"

config/dev.exs

@@ -14,6 +14,12 @@ config :music_library, MusicLibrary.ErrorRepo,
   stacktrace: true,
   show_sensitive_data_on_connection_error: true
 
+config :music_library, MusicLibrary.BackgroundRepo,
+  database: Path.expand("../data/music_library_background_dev.db", __DIR__),
+  pool_size: 5,
+  stacktrace: true,
+  show_sensitive_data_on_connection_error: true
+
 # For development, we disable any cache and enable
 # debugging and code reloading.
 #

config/runtime.exs

@@ -68,6 +68,19 @@ if config_env() == :prod do
     cache_size: -8000,
     pool_size: String.to_integer(System.get_env("POOL_SIZE") || "5")
 
+  background_database_path =
+    System.get_env("BACKGROUND_DATABASE_PATH") ||
+      raise """
+      environment variable BACKGROUND_DATABASE_PATH is missing.
+      For example: /etc/music_library/music_library_background.db
+      """
+
+  config :music_library, MusicLibrary.BackgroundRepo,
+    database: background_database_path,
+    # 16MB * pool_size = base memory usage
+    cache_size: -8000,
+    pool_size: String.to_integer(System.get_env("POOL_SIZE") || "5")
+
   # The secret key base is used to sign/encrypt cookies and other secrets.
   # A default value is used in config/dev.exs and config/test.exs but you
   # want to use a different value for prod and you most likely don't want

config/test.exs

@@ -16,6 +16,11 @@ config :music_library, MusicLibrary.ErrorRepo,
   pool_size: 32,
   pool: Ecto.Adapters.SQL.Sandbox
 
+config :music_library, MusicLibrary.BackgroundRepo,
+  database: Path.expand("../data/music_library_background_test.db", __DIR__),
+  pool_size: 32,
+  pool: Ecto.Adapters.SQL.Sandbox
+
 # We don't run a server during test. If one is required,
 # you can enable the server option below.
 config :music_library, MusicLibraryWeb.Endpoint,
@@ -51,3 +56,5 @@ config :music_library, MusicBrainz,
 config :phoenix_test, :endpoint, MusicLibraryWeb.Endpoint
 
 config :floki, :html_parser, Floki.HTMLParser.FastHtml
+
+config :music_library, Oban, testing: :manual