FEATURE: Ability to clear a user's penalty history

You can do this manually if you want to allow them to reach TL3 without
their penalty history counting against them.

app/assets/javascripts/admin/controllers/admin-user-index.js.es6

@@ -103,6 +103,16 @@ export default Ember.Controller.extend(CanCheckEmails, {
     anonymize() { return this.get('model').anonymize(); },
     disableSecondFactor() { return this.get('model').disableSecondFactor(); },
 
+
+    clearPenaltyHistory() {
+      let user = this.get('model');
+      return ajax(`/admin/users/${user.get('id')}/penalty_history`, {
+        type: 'DELETE'
+      }).then(() => {
+        user.set('tl3_requirements.penalty_counts.total', 0);
+      }).catch(popupAjaxError);
+    },
+
     destroy() {
       const postCount = this.get('model.post_count');
       if (postCount <= 5) {

app/assets/javascripts/admin/templates/user-index.hbs

@@ -408,6 +408,21 @@
     </div>
   {{/if}}
 
+  {{#if model.tl3_requirements.penalty_counts.total}}
+    <div class='display-row clear-penalty-history'>
+      <div class='field'>{{i18n 'admin.user.penalty_count'}}</div>
+      <div class='value'>{{model.tl3_requirements.penalty_counts.total}}</div>
+      {{#if currentUser.admin}}
+        <div class='controls'>
+          {{d-button label="admin.user.clear_penalty_history.title"
+                     icon="times"
+                     action=(action "clearPenaltyHistory")}}
+          {{i18n "admin.user.clear_penalty_history.description"}}
+        </div>
+      {{/if}}
+    </div>
+  {{/if}}
+
 </section>
 
 {{#if currentUser.admin}}

app/controllers/admin/users_controller.rb

@@ -54,6 +54,46 @@ class Admin::UsersController < Admin::AdminController
     end
   end
 
+  # DELETE action to delete penalty history for a user
+  def penalty_history
+
+    # We don't delete any history, we merely remove the action type
+    # with a removed type. It can still be viewed in the logs but
+    # will not affect TL3 promotions.
+    sql = <<~SQL
+      UPDATE user_histories
+      SET action = CASE
+        WHEN action = :silence_user THEN :removed_silence_user
+        WHEN action = :unsilence_user THEN :removed_unsilence_user
+        WHEN action = :suspend_user THEN :removed_suspend_user
+        WHEN action = :unsuspend_user THEN :removed_unsuspend_user
+      END
+      WHERE target_user_id = :user_id
+        AND action IN (
+          :silence_user,
+          :suspend_user,
+          :unsilence_user,
+          :unsuspend_user
+        )
+    SQL
+
+    UserHistory.exec_sql(
+      sql,
+      UserHistory.actions.slice(
+        :silence_user,
+        :suspend_user,
+        :unsilence_user,
+        :unsuspend_user,
+        :removed_silence_user,
+        :removed_unsilence_user,
+        :removed_suspend_user,
+        :removed_unsuspend_user
+      ).merge(user_id: params[:user_id].to_i)
+    )
+
+    render json: success_json
+  end
+
   def suspend
     guardian.ensure_can_suspend!(@user)
     @user.suspended_till = params[:suspend_until]

app/models/user_history.rb

@@ -76,6 +76,10 @@ class UserHistory < ActiveRecord::Base
       create_badge: 57,
       change_badge: 58,
       delete_badge: 59,
+      removed_silence_user: 60,
+      removed_suspend_user: 61,
+      removed_unsilence_user: 62,
+      removed_unsuspend_user: 63,
     )
   end
 
@@ -90,6 +94,8 @@ class UserHistory < ActiveRecord::Base
       :change_site_text,
       :suspend_user,
       :unsuspend_user,
+      :removed_suspend_user,
+      :removed_unsuspend_user,
       :grant_badge,
       :revoke_badge,
       :check_email,
@@ -106,6 +112,8 @@ class UserHistory < ActiveRecord::Base
       :create_category,
       :silence_user,
       :unsilence_user,
+      :removed_silence_user,
+      :removed_unsilence_user,
       :grant_admin,
       :revoke_admin,
       :grant_moderation,