WN-172, I've added the KeyMessage and SupportingMessage models with their respective relations.

Author: LDFOUR\luisd

app/Models/KeyMessage.php

@@ -0,0 +1,74 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\Validator;
+
+class KeyMessage extends Model
+{
+    /**
+     * The database table used by the model.
+     *
+     * @var string
+     */
+    protected $table = 'key_messages';
+
+    /**
+     * @var
+     */
+    protected $errors;
+
+    /**
+     * @var bool
+     */
+    public $timestamps = false;
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['entities_stage_id', 'title'];
+
+    /**
+     * Model validation rules
+     *
+     * @var array
+     */
+    protected $rules = [
+        'entities_stage_id' => 'required|integer',
+        'title' => 'required|string|between:2,255',
+    ];
+
+    public function validate($data)
+    {
+        $v = Validator::make($data, $this->rules);
+
+        if ($v->fails()) {
+            $this->errors = $v->errors();
+
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function errors()
+    {
+        return $this->errors;
+    }
+
+    public function entityStage()
+    {
+        return $this->belongsTo(WhatnowEntityStage::class, 'entities_stage_id');
+    }
+
+    public function supportingMessages()
+    {
+        return $this->hasMany(SupportingMessage::class, 'key_message_id');
+    }
+}

app/Models/SupportingMessage.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\Validator;
+
+class SupportingMessage extends Model
+{
+    /**
+     * The database table used by the model.
+     *
+     * @var string
+     */
+    protected $table = 'supporting_messages';
+
+    /**
+     * @var
+     */
+    protected $errors;
+
+    /**
+     * @var bool
+     */
+    public $timestamps = false;
+
+    /**
+     * The attributes that are mass assignable.
+     * @var array
+     */
+    protected $fillable = ['key_message_id', 'content'];
+
+    /**
+     * Model validation rules
+     * @var array
+     */
+    protected $rules = [
+        'key_message_id' => 'required|integer',
+        'content' => 'required|string|between:2,1000',
+    ];
+
+    /**
+     * @param $data
+     * @return bool
+     */
+    public function validate($data)
+    {
+        $v = Validator::make($data, $this->rules);
+
+        if ($v->fails()) {
+            $this->errors = $v->errors();
+
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @return mixed
+     */
+    public function errors()
+    {
+        return $this->errors;
+    }
+
+    public function keyMessage()
+    {
+        return $this->belongsTo(KeyMessage::class, 'key_message_id');
+    }
+}

app/Models/WhatNowEntityStage.php

@@ -32,7 +32,6 @@ class WhatNowEntityStage extends Model
     protected $fillable = [
         'translation_id',
         'language_code',
-        'urgency_id'
 
     ];
 
@@ -43,8 +42,6 @@ class WhatNowEntityStage extends Model
      */
     protected $rules = [
         'language_code' => 'required|string|between:2,10',
-        'urgency_id' => 'required|integer',
-        'content' => 'string'
     ];
 
     /**
@@ -76,4 +73,9 @@ public function translation()
     {
         return $this->belongsTo('App\Models\WhatNowEntityTranslation', 'translation_id', 'id');
     }
+
+    public function keyMessages()
+	{
+		return $this->hasMany(KeyMessage::class, 'entities_stage_id', 'id');
+	}
 }