feat: enums, schema and models for hado core

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BCrwHHnGCB5XH968Nxokqw

core/app/Models/Event.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\AfterDue;
+use App\Enums\DueMode;
+use App\Enums\EventState;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Event extends Model
+{
+    protected $guarded = [];
+
+    protected function casts(): array
+    {
+        return [
+            'due_mode' => DueMode::class,
+            'after_due' => AfterDue::class,
+            'state' => EventState::class,
+            'due_date' => 'immutable_date',
+            'fire_on' => 'immutable_date',
+            'due_instant' => 'immutable_datetime',
+            'quiet_until' => 'immutable_datetime',
+            'done_at' => 'immutable_datetime',
+            'payload' => 'array',
+        ];
+    }
+
+    public function source(): BelongsTo
+    {
+        return $this->belongsTo(Source::class);
+    }
+
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function deliveries(): HasMany
+    {
+        return $this->hasMany(Delivery::class);
+    }
+
+    public function isTerminal(): bool
+    {
+        return $this->state->isTerminal();
+    }
+}