Persist telemetry data in local sqlite database

config/config.exs

@@ -14,7 +14,7 @@ config :elixir, :time_zone_database, TimeZoneInfo.TimeZoneDatabase
 config :time_zone_info, update: :daily
 
 config :music_library,
-  ecto_repos: [MusicLibrary.BackgroundRepo, MusicLibrary.Repo],
+  ecto_repos: [MusicLibrary.BackgroundRepo, MusicLibrary.Repo, MusicLibrary.TelemetryRepo],
   generators: [timestamp_type: :utc_datetime, binary_id: true]
 
 config :music_library, default_timezone: "Europe/London"
@@ -112,6 +112,10 @@ config :oban_met, sketch_time_unit: :millisecond
 
 config :music_library, MusicLibrary.BackgroundRepo, priv: "priv/background_repo"
 
+config :music_library, MusicLibrary.TelemetryRepo, priv: "priv/telemetry_repo", log: false
+
+config :music_library, MusicLibraryWeb.Telemetry.Storage, buffer_size: 1024
+
 config :swoosh, :api_client, Swoosh.ApiClient.Req
 
 config :music_library, MusicLibrary.Mailer,

config/dev.exs

@@ -14,6 +14,12 @@ config :music_library, MusicLibrary.BackgroundRepo,
   stacktrace: true,
   show_sensitive_data_on_connection_error: true
 
+config :music_library, MusicLibrary.TelemetryRepo,
+  database: Path.expand("../data/music_library_telemetry_dev.db", __DIR__),
+  pool_size: 3,
+  stacktrace: true,
+  show_sensitive_data_on_connection_error: true
+
 # For development, we disable any cache and enable
 # debugging and code reloading.
 #

config/runtime.exs

@@ -117,6 +117,19 @@ if config_env() == :prod do
     pool_size: String.to_integer(System.get_env("POOL_SIZE") || "5"),
     show_sensitive_data_on_connection_error: false
 
+  telemetry_database_path =
+    System.get_env("TELEMETRY_DATABASE_PATH") ||
+      raise """
+      environment variable TELEMETRY_DATABASE_PATH is missing.
+      For example: /etc/music_library/music_library_telemetry.db
+      """
+
+  config :music_library, MusicLibrary.TelemetryRepo,
+    database: telemetry_database_path,
+    cache_size: -4000,
+    pool_size: 2,
+    show_sensitive_data_on_connection_error: false
+
   # 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

@@ -21,6 +21,15 @@ config :music_library, MusicLibrary.BackgroundRepo,
   pool_size: 32,
   pool: Ecto.Adapters.SQL.Sandbox
 
+config :music_library, MusicLibrary.TelemetryRepo,
+  database:
+    Path.expand(
+      "../data/music_library_telemetry_test#{System.get_env("MIX_TEST_PARTITION")}.db",
+      __DIR__
+    ),
+  pool_size: 5,
+  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,