Feat:fregment update

lib/cesium_link/links.ex

@@ -65,7 +65,7 @@ defmodule CesiumLink.Links do
   """
   def list_unarchived_links_by_index do
     Link
-    |> where([l], fragment("? > now()", l.publish_at))
+    |> where([l], fragment("? <= now() OR ? IS NULL", l.publish_at, l.publish_at))
     |> where([l], l.archived == false)
     |> order_by([l], asc: l.index)
     |> Repo.all()

lib/cesium_link_web/live/link_live/form_component.ex

@@ -19,6 +19,7 @@ defmodule CesiumLinkWeb.LinkLive.FormComponent do
         <.input field={@form[:emoji]} type="emoji" label="Emoji" />
         <.input field={@form[:url]} type="text" label="URL" />
         <.input field={@form[:attention]} type="checkbox" label="Attention" />
+        <.input field={@form[:publish_at]} type="datetime-local" label="Publish At" />
         <:actions>
           <.button phx-disable-with="Saving...">Save Link</.button>
         </:actions>