A lot of things.

app/Models/Author.php

@@ -2,11 +2,29 @@
 
 namespace App\Models;
 
+use App\Auth\XenForoUser;
+use App\Services\XenforoService;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Author extends Model
 {
     protected $fillable = [
         'name', 'slug', 'user_id', 'website'
     ];
+
+    public function entries(): BelongsToMany
+    {
+        return $this->belongsToMany(Entry::class, 'entry_authors');
+    }
+
+    public function user(): ?XenForoUser
+    {
+        if( !$this->user_id )
+            return null;
+
+        return app(XenforoService::class)->getXfUser($this->user_id);
+    }
+
 }

app/Models/EntryFile.php

@@ -8,7 +8,7 @@ use Illuminate\Database\Eloquent\Relations\BelongsTo;
 class EntryFile extends Model
 {
     protected $fillable = [
-        'entry_id', 'filename', 'filepath', 'favorite_server', 'favorite_at', 'filesize', 'state', 'file_uuid'
+        'entry_id', 'filename', 'filepath', 'favorite_server', 'favorite_at', 'filesize', 'state', 'file_uuid', 'online_patcher', 'secondary_online_patcher',
     ];
 
     protected $casts = [

app/Models/Game.php

@@ -21,4 +21,9 @@ class Game extends Model
     {
         return $this->belongsTo(Genre::class);
     }
+
+    public function entries(): Game|\Illuminate\Database\Eloquent\Relations\HasMany
+    {
+        return $this->hasMany(Entry::class);
+    }
 }

app/Models/Genre.php

@@ -3,8 +3,15 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Genre extends Model
 {
     protected $fillable = [ 'name', 'slug' ];
+
+    public function games(): HasMany
+    {
+        return $this->hasMany(Game::class);
+    }
 }

app/Models/Language.php

@@ -3,8 +3,15 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Language extends Model
 {
     protected $fillable = [ 'name', 'slug' ];
+
+    public function entries(): BelongsToMany
+    {
+        return $this->belongsToMany(Entry::class, 'entry_languages');
+    }
 }

app/Models/Platform.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Platform extends Model
 {
@@ -14,4 +15,13 @@ class Platform extends Model
         'name', 'slug', 'short_name'
     ];
 
+    public function games(): HasMany
+    {
+        return $this->hasMany(Game::class);
+    }
+
+    public function entries(): HasMany
+    {
+        return $this->hasMany(Entry::class);
+    }
 }