++ fix: use months for assignment PDF link TTL instead of hours

app/Models/Assegnazione.php

@@ -4,6 +4,8 @@ namespace App\Models;
 
 use Carbon\Carbon;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\URL;
+use Illuminate\Support\Str;
 
 class Assegnazione extends Model
 {
@@ -17,6 +19,7 @@ class Assegnazione extends Model
         'returned_at',
         'counted_in_campaign',
         'campaign_id',
+        'pdf_access_code',
         'note',
         'created_by',
         'returned_by',
@@ -79,6 +82,39 @@ class Assegnazione extends Model
         return is_null($this->returned_at);
     }
 
+    public function ensurePdfAccessCode(): string
+    {
+        if ($this->pdf_access_code) {
+            return $this->pdf_access_code;
+        }
+
+        do {
+            $code = strtoupper(Str::random(12));
+        } while (static::query()->where('pdf_access_code', $code)->exists());
+
+        $this->forceFill(['pdf_access_code' => $code])->saveQuietly();
+
+        return $code;
+    }
+
+    public function temporaryPdfViewerUrl(): ?string
+    {
+        if (! $this->is_aperta || ! $this->territorio?->pdf_path) {
+            return null;
+        }
+
+        $months = max(1, (int) Setting::getValue('assignment_link_ttl_hours', 1));
+
+        return URL::temporarySignedRoute(
+            'assignments.pdf.viewer',
+            now()->addMonths($months),
+            [
+                'assignment' => $this->id,
+                'code' => $this->ensurePdfAccessCode(),
+            ]
+        );
+    }
+
     // ─── Scopes ─────────────────────────────────────────────────
 
     public function scopeAperte($query)

app/Models/Setting.php

@@ -6,6 +6,8 @@ use Illuminate\Database\Eloquent\Model;
 
 class Setting extends Model
 {
+    protected static ?self $cachedInstance = null;
+
     protected $fillable = [
         'congregazione_nome',
         'logo_path',
@@ -13,6 +15,7 @@ class Setting extends Model
         'giorni_giacenza_prioritari',
         'giorni_per_smarrito',
         'home_limit_list',
+        'assignment_link_ttl_hours',
         'audit_retention_days',
         'setup_completed',
     ];
@@ -25,22 +28,41 @@ class Setting extends Model
             'giorni_giacenza_prioritari' => 'integer',
             'giorni_per_smarrito' => 'integer',
             'home_limit_list' => 'integer',
+            'assignment_link_ttl_hours' => 'integer',
             'audit_retention_days' => 'integer',
         ];
     }
 
+    protected static function booted(): void
+    {
+        static::saved(function (): void {
+            static::$cachedInstance = null;
+        });
+
+        static::deleted(function (): void {
+            static::$cachedInstance = null;
+        });
+    }
+
     /**
      * Get the singleton settings instance (first row).
      */
     public static function instance(): static
     {
-        return static::firstOrCreate([], [
+        if (static::$cachedInstance instanceof static) {
+            return static::$cachedInstance;
+        }
+
+        static::$cachedInstance = static::firstOrCreate([], [
             'giorni_giacenza_da_assegnare' => 120,
             'giorni_giacenza_prioritari' => 180,
             'giorni_per_smarrito' => 120,
             'home_limit_list' => 10,
+            'assignment_link_ttl_hours' => 1,
             'audit_retention_days' => 730,
         ]);
+
+        return static::$cachedInstance;
     }
 
     public static function isSetupComplete(): bool

app/Models/Territorio.php

@@ -107,11 +107,11 @@ class Territorio extends Model
         $ultima = $this->ultimaAssegnazione;
 
         if ($ultima && $ultima->returned_at) {
-            return Carbon::parse($ultima->returned_at)->diffInDays(now());
+            return Carbon::parse($ultima->returned_at)->startOfDay()->diffInDays(today());
         }
 
         if (!$ultima) {
-            return $this->created_at->diffInDays(now());
+            return $this->created_at->startOfDay()->diffInDays(today());
         }
 
         // Currently assigned, no giacenza concept