Implement Keystone environment deployments

app/Models/Operation.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\OperationKind;
+use App\Enums\OperationStatus;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+class Operation extends Model
+{
+    use HasFactory;
+
+    protected $guarded = [];
+
+    public static function boot(): void
+    {
+        parent::boot();
+
+        static::creating(function (self $operation) {
+            $operation->hash ??= str()->random(16);
+        });
+    }
+
+    protected function casts(): array
+    {
+        return [
+            'kind' => OperationKind::class,
+            'status' => OperationStatus::class,
+            'started_at' => 'datetime',
+            'finished_at' => 'datetime',
+        ];
+    }
+
+    public function parent(): BelongsTo
+    {
+        return $this->belongsTo(Operation::class, 'parent_id');
+    }
+
+    public function children(): HasMany
+    {
+        return $this->hasMany(Operation::class, 'parent_id');
+    }
+
+    public function steps(): HasMany
+    {
+        return $this->hasMany(OperationStep::class);
+    }
+
+    public function target(): MorphTo
+    {
+        return $this->morphTo('target');
+    }
+}