feat(episodes): replace soft delete with permanent delete

+ add constraint to prevent deleting an episode when published

app/Models/EpisodeModel.php

@@ -94,11 +94,6 @@ class EpisodeModel extends Model
      */
     protected $returnType = Episode::class;
 
-    /**
-     * @var bool
-     */
-    protected $useSoftDeletes = true;
-
     /**
      * @var bool
      */
@@ -249,6 +244,18 @@ class EpisodeModel extends Model
         return $found;
     }
 
+    /**
+     * Returns number of episodes of a podcast
+     */
+    public function getPodcastEpisodesCount(int $podcastId): int|string
+    {
+        return $this
+            ->where([
+                'podcast_id' => $podcastId,
+            ])
+            ->countAllResults();
+    }
+
     /**
      * Returns the timestamp difference in seconds between the next episode to publish and the current timestamp Returns
      * false if there's no episode to publish