Add button to set scrapers back to some timestamp

When scrapers break and report success, like in twitters case, see #108

app/controllers/submission_files_controller.rb

@@ -25,6 +25,11 @@ def modify_hidden
     submission_file.update(hidden_from_search_at: hide_from_search ? Time.current : nil)
   end
 
+  def set_last_known_good
+    submission_file = SubmissionFile.find(params[:id])
+    submission_file.artist_url.update(last_scraped_at: submission_file.created_at_on_site - 1.day)
+  end
+
   def update_e6_posts
     submission_file = SubmissionFile.find(params[:id])
     submission_file.update_e6_posts(priority: E6IqdbQueryJob::PRIORITIES[:immediate])

app/views/submission_files/_secondary_links.html.erb

@@ -4,10 +4,14 @@
 <% if instance_variable_defined?(:@search_params) %>
   <%= subnav_link_to "Update IQDB for matching", update_matching_e6_posts_submission_files_path(search: @search_params), method: :post, data: { confirm: "Are you sure?" } %>
 <% end %>
-<% if @submission_file&.artist %>
+<% if @submission_file&.id %>
   |
   <%= subnav_link_to "All From Artist", artist_path(@submission_file.artist) %>
   <%= subnav_link_to "All From URL", artist_path(@submission_file.artist, search: { artist_url_id: [@submission_file.artist_url.id] }) %>
   <%= subnav_link_to "Update E6 IQDB", update_e6_posts_submission_file_path(@submission_file), method: :post %>
+  <% if @submission_file.artist_url.last_scraped_at %>
+    |
+    <%= subnav_link_to "Last known good", set_last_known_good_submission_file_path(@submission_file), method: :put, data: { confirm: "Fix broken scrapers. Everything after this may be downloaded again if it failed in the past but is now fixed through an update. Will not cause duplicate entries." } %>
+  <% end %>
 <% end %>
 | <%= render "submission_files/multiselect" %>

config/routes.rb

@@ -25,6 +25,7 @@
       post :update_e6_posts
       put :modify_backlog
       put :modify_hidden
+      put :set_last_known_good
     end
     collection do
       get :backlog

test/controllers/submission_files_controller_test.rb

@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class SubmissionFilesControllerTest < ActionDispatch::IntegrationTest
+  test "last known good" do
+    artist_url = create(:artist_url, last_scraped_at: Time.current)
+    sm = create(:submission_file, artist_submission: create(:artist_submission, artist_url: artist_url), created_at_on_site: 7.days.ago)
+
+    put set_last_known_good_submission_file_path(sm)
+    assert_response :success
+    assert_in_delta artist_url.reload.last_scraped_at, 8.days.ago, 1
+  end
+end