A lot of things

Entity/EntryFeaturedRequest.php

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+<?php
+
+namespace RomhackPlaza\Master\Entity;
+
+use XF\Entity\ApprovalQueue;
+use XF\Entity\User;
+use XF\Mvc\Entity\Entity;
+use XF\Mvc\Entity\Structure;
+
+/**
+ * @property-read int featured_request_id
+ * @property int $entry_id
+ * @property int $user_id
+ * @property string $entry_title
+ * @property string featured_request_state
+ * @property int featured_request_date
+ * @property-read ?User User
+ */
+class EntryFeaturedRequest extends Entity
+{
+    #[\Override]
+    public static function getStructure(Structure $structure)
+    {
+        $structure->shortName = 'RomhackPlaza\Master:EntryFeaturedRequest';
+        $structure->table = 'xf_romhackplaza_entry_featured_request';
+        $structure->primaryKey = 'featured_request_id';
+
+        $structure->columns = [
+            'featured_request_id' => ['type' => self::UINT, 'autoIncrement' => true],
+            'entry_id' => ['type' => self::UINT, 'required' => true],
+            'user_id' => ['type' => self::UINT],
+            'entry_title' => ['type' => self::STR, 'maxLength' => 255],
+            'featured_request_state' => ['type' => self::STR, 'default' => 'moderated',
+                'allowedValues' => ['visible', 'moderated', 'rejected']
+            ],
+            'featured_request_date' => ['type' => self::UINT, 'default' => \XF::$time]
+        ];
+
+		$structure->relations = [
+            'User' => [
+                'entity' => 'XF:User',
+                'type' => self::TO_ONE,
+                'conditions' => 'user_id',
+                'primary' => true
+            ],
+        ];
+
+        return $structure;
+
+    }
+
+    protected function _postSave()
+    {
+        if( $this->isInsert() && $this->featured_request_state === 'moderated' ) {
+            $this->inQueue();
+        } else if( $this->isUpdate() && $this->isChanged('featured_request_state') ) {
+            if( $this->featured_request_state === 'moderated' ) {
+                $this->inQueue();
+            } else {
+                $this->removeQueue();
+            }
+        }
+    }
+
+    protected function _postDelete()
+    {
+        if( $this->featured_request_state === 'moderated' ) {
+            $this->removeQueue();
+        }
+    }
+
+    protected function inQueue()
+    {
+        $queue = $this->em()->find('XF:ApprovalQueue', ['rhpz_entry_featurerequest', $this->featured_request_id ] );
+        if( !$queue )
+        {
+            /** @var ApprovalQueue $newQueue */
+            $newQueue = $this->em()->create('XF:ApprovalQueue');
+            $newQueue->content_type = 'rhpz_entry_featurerequest';
+            $newQueue->content_id = $this->featured_request_id;
+            $newQueue->save();
+        }
+    }
+
+    protected function removeQueue()
+    {
+        $queue = $this->em()->find('XF:ApprovalQueue', ['rhpz_entry_featurerequest', $this->featured_request_id ] );
+        if( $queue )
+            $queue->delete();
+    }
+}

Entity/News.php

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+<?php
+
+namespace RomhackPlaza\Master\Entity;
+
+use XF\Mvc\Entity\Entity;
+use XF\Mvc\Entity\Structure;
+
+class News extends Entity
+{
+    #[Override]
+    public static function getStructure(Structure $structure)
+    {
+        $structure->shortName = 'RomhackPlaza\Master:News';
+        $structure->table = 'xf_romhackplaza_news'; // Unused.
+        $structure->primaryKey = 'id';
+
+        $structure->columns = [
+            'id' => ['type' => self::UINT],
+            'user_id' => ['type' => self::UINT, 'required' => true],
+            'title' => ['type' => self::STR, 'required' => true],
+            'slug' => ['type' => self::STR, 'required' => true],
+        ];
+
+        return $structure;
+    }
+}