analytics/lib/mix/tasks/check_overuse.ex

defmodule Mix.Tasks.CheckOveruse do
  use Mix.Task
  use Plausible.Repo
  require Logger

  @doc """
  This is scheduled to run every 6 hours.
  """

  def run(args) do
    Application.ensure_all_started(:plausible)
    Logger.configure(level: :error)
    execute(args)
  end

  def execute(_args \\ []) do
    active_users = Repo.all(
      from u in Plausible.Auth.User,
      join: s in Plausible.Billing.Subscription, on: s.user_id == u.id,
      where: s.status == "active",
      select: {u, s}
    )

    for {user, subscription} <- active_users do
      IO.puts("Checking #{user.email}...")
      usage = Plausible.Billing.usage(user)
      allowance = Plausible.Billing.Plans.allowance(subscription)
      if usage > allowance do
        IO.puts("Overuse: #{user.email}")
        IO.puts("Usage: #{usage}")
        IO.puts("Allowance: #{allowance}")
      end
    end
  end
end