fix warning and fix purging

Author: yordis

lib/guardian/db/adapter.ex

@@ -6,15 +6,15 @@ defmodule Guardian.DB.Adapter do
   for Guardian Tokens.
   """
 
-  @typep query :: Ecto.Query.t()
+
   @typep schema :: Ecto.Schema.t()
   @typep changeset :: Ecto.Changeset.t()
   @typep schema_or_changeset :: schema() | changeset()
   @typep claims :: map()
   @typep exp :: pos_integer()
   @typep sub :: binary()
   @typep opts :: keyword()
-  @typep id :: pos_integer() | binary() | Ecto.UUID.t()
+
 
   @doc """
   Retrieves JWT token

lib/guardian/db/ecto_adapter.ex

@@ -64,7 +64,6 @@ defmodule Guardian.DB.EctoAdapter do
   def purge_expired_tokens(timestamp, opts) do
     prefix = Keyword.get(opts, :prefix, nil)
     repo = Keyword.get(opts, :repo)
-    timestamp = Guardian.timestamp()
 
     opts
     |> query_schema()

lib/guardian/db/ets_adapter.ex

@@ -75,8 +75,6 @@ defmodule Guardian.DB.ETSAdapter do
     |> delete_many(table)
   end
 
-  defp expired_tokens({_jti, _aud, _sub, token}, exp), do: token.exp < exp
-
   defp delete_many(tokens, table) do
     deleted_tokens =
       Enum.reduce(tokens, [], fn [jti, token], acc ->

lib/guardian/db/token.ex

@@ -5,7 +5,6 @@ defmodule Guardian.DB.Token do
 
   use Ecto.Schema
   import Ecto.Changeset
-  import Ecto.Query, only: [where: 3]
 
   alias Guardian.DB.Token
 

lib/mix/tasks/guardian_db.gen.migration.ex

@@ -11,7 +11,6 @@ defmodule Mix.Tasks.Guardian.Db.Gen.Migration do
 
   import Mix.Ecto
   import Mix.Generator
-  alias Guardian.DB.Token
 
   @doc false
   def run(args) do