feat: init postgresql database

app/Models/Postgresql.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+
+class Postgresql extends BaseModel
+{
+    use HasFactory;
+    protected $guarded = [];
+    protected $casts = [
+        'postgres_password' => 'encrypted',
+    ];
+    public function type() {
+        return 'postgresql';
+    }
+    public function environment()
+    {
+        return $this->belongsTo(Environment::class);
+    }
+    public function destination()
+    {
+        return $this->morphTo();
+    }
+}