starting repo

lib/cobblemon_ui/application.ex

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+defmodule CobblemonUi.Application do
+  # See https://hexdocs.pm/elixir/Application.html
+  # for more information on OTP Applications
+  @moduledoc false
+
+  use Application
+
+  @impl true
+  def start(_type, _args) do
+    children = [
+      CobblemonUiWeb.Telemetry,
+      CobblemonUi.Repo,
+      {DNSCluster, query: Application.get_env(:cobblemon_ui, :dns_cluster_query) || :ignore},
+      {Phoenix.PubSub, name: CobblemonUi.PubSub},
+      # Start a worker by calling: CobblemonUi.Worker.start_link(arg)
+      # {CobblemonUi.Worker, arg},
+      # Start to serve requests, typically the last entry
+      CobblemonUiWeb.Endpoint
+    ]
+
+    # See https://hexdocs.pm/elixir/Supervisor.html
+    # for other strategies and supported options
+    opts = [strategy: :one_for_one, name: CobblemonUi.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+
+  # Tell Phoenix to update the endpoint configuration
+  # whenever the application is updated.
+  @impl true
+  def config_change(changed, _new, removed) do
+    CobblemonUiWeb.Endpoint.config_change(changed, removed)
+    :ok
+  end
+end

lib/cobblemon_ui/mailer.ex

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+defmodule CobblemonUi.Mailer do
+  use Swoosh.Mailer, otp_app: :cobblemon_ui
+end

lib/cobblemon_ui/repo.ex

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+defmodule CobblemonUi.Repo do
+  use Ecto.Repo,
+    otp_app: :cobblemon_ui,
+    adapter: Ecto.Adapters.Postgres
+end