improve accuracy of timestamps

lib/memex/pipelines/pipeline.ex

@@ -28,7 +28,7 @@ defmodule Memex.Pipelines.Pipeline do
 
     has_many :steps, Step, preload_order: [asc: :position]
 
-    timestamps()
+    timestamps(type: :utc_datetime_usec)
   end
 
   @type t :: %__MODULE__{
@@ -38,8 +38,8 @@ defmodule Memex.Pipelines.Pipeline do
           tags_string: String.t() | nil,
           visibility: :public | :private | :unlisted,
           user_id: User.id(),
-          inserted_at: NaiveDateTime.t(),
-          updated_at: NaiveDateTime.t()
+          inserted_at: DateTime.t(),
+          updated_at: DateTime.t()
         }
   @type id :: UUID.t()
   @type slug :: String.t()

lib/memex/pipelines/step.ex

@@ -22,7 +22,7 @@ defmodule Memex.Pipelines.Steps.Step do
     belongs_to :pipeline, Pipeline
     field :user_id, :binary_id
 
-    timestamps()
+    timestamps(type: :utc_datetime_usec)
   end
 
   @type t :: %__MODULE__{
@@ -32,8 +32,8 @@ defmodule Memex.Pipelines.Steps.Step do
           pipeline: Pipeline.t() | Ecto.Association.NotLoaded.t(),
           pipeline_id: Pipeline.id(),
           user_id: User.id(),
-          inserted_at: NaiveDateTime.t(),
-          updated_at: NaiveDateTime.t()
+          inserted_at: DateTime.t(),
+          updated_at: DateTime.t()
         }
   @type id :: UUID.t()
   @type changeset :: Changeset.t(t())