added media, mutation events, agent instructions

app/Models/Dynamic.php

@@ -21,7 +21,7 @@ class Dynamic extends Model
 
     public function participants(): BelongsToMany
     {
-        return $this->belongsToMany(User::class, 'participants');
+        return $this->belongsToMany(User::class, 'participants')->withPivot('role');
     }
 
     public function ledgers(): HasMany

app/Models/Ledger.php

@@ -29,4 +29,9 @@ class Ledger extends Model
     {
         return $this->hasMany(Mutation::class);
     }
+
+    public function media(): \Illuminate\Database\Eloquent\Relations\MorphMany
+    {
+        return $this->morphMany(Media::class, 'mediable');
+    }
 }

app/Models/Media.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+class Media extends Model {
+    use HasFactory;
+
+    protected $fillable = [
+        'file_path',
+        'file_name',
+        'mime_type',
+    ];
+
+    protected $appends = ['url'];
+
+    public function mediable(): MorphTo {
+        return $this->morphTo();
+    }
+
+    public function getUrlAttribute(): string {
+        return asset('storage/' . $this->file_path);
+    }
+}

app/Models/Message.php

@@ -27,4 +27,9 @@ class Message extends Model
     {
         return $this->belongsTo(User::class);
     }
+
+    public function media(): \Illuminate\Database\Eloquent\Relations\MorphMany
+    {
+        return $this->morphMany(Media::class, 'mediable');
+    }
 }

app/Models/Mutation.php

@@ -37,6 +37,11 @@ class Mutation extends Model
         return $this->morphOne(Chat::class, 'chatable');
     }
 
+    public function media(): \Illuminate\Database\Eloquent\Relations\MorphMany
+    {
+        return $this->morphMany(Media::class, 'mediable');
+    }
+
     protected static function booted(): void
     {
         static::created(function (Mutation $mutation) {