Added recycle bin auto-clear lifetime functionality

app/Config/app.php

@@ -31,6 +31,13 @@ return [
     // If set to false then a limit will not be enforced.
     'revision_limit' => env('REVISION_LIMIT', 50),
 
+    // The number of days that content will remain in the recycle bin before
+    // being considered for auto-removal. It is not a guarantee that content will
+    // be removed after this time.
+    // Set to 0 for no recycle bin functionality.
+    // Set to -1 for unlimited recycle bin lifetime.
+    'recycle_bin_lifetime' => env('RECYCLE_BIN_LIFETIME', 30),
+
     // Allow <script> tags to entered within page content.
     // <script> tags are escaped by default.
     // Even when overridden the WYSIWYG editor may still escape script content.

app/Entities/Managers/TrashCan.php

@@ -13,6 +13,7 @@ use BookStack\Facades\Activity;
 use BookStack\Uploads\AttachmentService;
 use BookStack\Uploads\ImageService;
 use Exception;
+use Illuminate\Support\Carbon;
 
 class TrashCan
 {
@@ -231,6 +232,30 @@ class TrashCan
         return $restoreCount;
     }
 
+    /**
+     * Automatically clear old content from the recycle bin
+     * depending on the configured lifetime.
+     * Returns the total number of deleted elements.
+     * @throws Exception
+     */
+    public function autoClearOld(): int
+    {
+        $lifetime = intval(config('app.recycle_bin_lifetime'));
+        if ($lifetime < 0) {
+            return 0;
+        }
+
+        $clearBeforeDate = Carbon::now()->addSeconds(10)->subDays($lifetime);
+        $deleteCount = 0;
+
+        $deletionsToRemove = Deletion::query()->where('created_at', '<', $clearBeforeDate)->get();
+        foreach ($deletionsToRemove as $deletion) {
+            $deleteCount += $this->destroyFromDeletion($deletion);
+        }
+
+        return $deleteCount;
+    }
+
     /**
      * Restore an entity so it is essentially un-deleted.
      * Deletions on restored child elements will be removed during this restoration.

app/Entities/Repos/BookRepo.php

@@ -129,5 +129,6 @@ class BookRepo
     {
         $trashCan = new TrashCan();
         $trashCan->softDestroyBook($book);
+        $trashCan->autoClearOld();
     }
 }

app/Entities/Repos/BookshelfRepo.php

@@ -175,5 +175,6 @@ class BookshelfRepo
     {
         $trashCan = new TrashCan();
         $trashCan->softDestroyShelf($shelf);
+        $trashCan->autoClearOld();
     }
 }

app/Entities/Repos/ChapterRepo.php

@@ -74,6 +74,7 @@ class ChapterRepo
     {
         $trashCan = new TrashCan();
         $trashCan->softDestroyChapter($chapter);
+        $trashCan->autoClearOld();
     }
 
     /**

app/Entities/Repos/PageRepo.php

@@ -266,6 +266,7 @@ class PageRepo
     {
         $trashCan = new TrashCan();
         $trashCan->softDestroyPage($page);
+        $trashCan->autoClearOld();
     }
 
     /**