diff --git a/app/Models/ActivityEvent.php b/app/Models/ActivityEvent.php
index 276bf3b1..bf33c882 100644
--- a/app/Models/ActivityEvent.php
+++ b/app/Models/ActivityEvent.php
@@ -3,6 +3,8 @@
 namespace App\Models;
 
 use App\Enums\ActivityType;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\MassPrunable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\MorphTo;
@@ -13,6 +15,8 @@ use Illuminate\Database\Eloquent\Relations\MorphTo;
  */
 class ActivityEvent extends Model
 {
+    use MassPrunable;
+
     public $timestamps = false;
 
     protected $fillable = [
@@ -50,4 +54,14 @@ class ActivityEvent extends Model
     {
         return $this->morphTo();
     }
+
+    /**
+     * Einträge nach der Löschfrist (config monitoring.retention, 395 Tage).
+     *
+     * @return Builder<static>
+     */
+    public function prunable(): Builder
+    {
+        return static::query()->where('occurred_at', '<', now()->subDays((int) config('monitoring.retention.activity_events_days')));
+    }
 }
diff --git a/app/Models/ApiUsageLog.php b/app/Models/ApiUsageLog.php
index d6d9f07c..de7cf87c 100644
--- a/app/Models/ApiUsageLog.php
+++ b/app/Models/ApiUsageLog.php
@@ -2,12 +2,16 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\MassPrunable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Laravel\Sanctum\PersonalAccessToken;
 
 class ApiUsageLog extends Model
 {
+    use MassPrunable;
+
     public $timestamps = false;
 
     protected $fillable = [
@@ -45,4 +49,14 @@ class ApiUsageLog extends Model
     {
         return $this->belongsTo(PersonalAccessToken::class);
     }
+
+    /**
+     * Zugriffe nach der Löschfrist (config monitoring.retention, 90 Tage).
+     *
+     * @return Builder<static>
+     */
+    public function prunable(): Builder
+    {
+        return static::query()->where('requested_at', '<', now()->subDays((int) config('monitoring.retention.api_usage_logs_days')));
+    }
 }
diff --git a/config/monitoring.php b/config/monitoring.php
index 4d72102b..15aede5f 100644
--- a/config/monitoring.php
+++ b/config/monitoring.php
@@ -82,6 +82,23 @@ return [
         'warn_per_day' => (int) env('MONITORING_FAILED_LOGIN_WARN_PER_DAY', 1000),
     ],
 
+    /*
+    |--------------------------------------------------------------------------
+    | Löschfristen der Protokolle (Roadmap 4.2)
+    |--------------------------------------------------------------------------
+    |
+    | Aktivitäts-Verlauf (activity_events: Anmeldungen, Statuswechsel,
+    | Admin-Aktionen) wie die Nutzungsstatistik in DSE 5a nach 395 Tagen;
+    | API-Zugriffsprotokoll (api_usage_logs, mit IP und User-Agent) nach
+    | 90 Tagen. Entfernt täglich um 04:05 über `model:prune`.
+    |
+    */
+
+    'retention' => [
+        'activity_events_days' => (int) env('MONITORING_ACTIVITY_RETENTION_DAYS', 395),
+        'api_usage_logs_days' => (int) env('MONITORING_API_USAGE_RETENTION_DAYS', 90),
+    ],
+
     'scheduler' => [
         'heartbeat_warn_minutes' => 3,
         'heartbeat_critical_minutes' => 10,
diff --git a/routes/console.php b/routes/console.php
index 6eca4848..924ae438 100644
--- a/routes/console.php
+++ b/routes/console.php
@@ -21,6 +21,8 @@ use App\Console\Commands\PurgeRedactionSnapshots;
 use App\Console\Commands\RefreshMarketData;
 use App\Console\Commands\ResetMonthlyPressReleaseQuota;
 use App\Console\Commands\SweepOrphanPressReleaseOriginals;
+use App\Models\ActivityEvent;
+use App\Models\ApiUsageLog;
 use App\Models\ContactMessage;
 use App\Models\FailedLoginTally;
 use App\Support\OperationalAlert;
@@ -259,13 +261,15 @@ Schedule::command(MonitoringHeartbeat::class)
     ->onFailure($alertOnFailure('monitoring:heartbeat'));
 
 // Tageszähler fehlgeschlagener Anmeldungen nach der Löschfrist entfernen
-// (täglich 04:05, config monitoring.failed_logins.retention_days) und
-// Spam-Quarantäne des Kontaktformulars nach 30 Tagen (Spamschutz B3).
-Schedule::command('model:prune', ['--model' => [FailedLoginTally::class, ContactMessage::class]])
+// (täglich 04:05, config monitoring.failed_logins.retention_days),
+// Spam-Quarantäne des Kontaktformulars nach 30 Tagen (Spamschutz B3),
+// Aktivitäts-Verlauf nach 395 und API-Zugriffsprotokoll nach 90 Tagen
+// (config monitoring.retention, Roadmap 4.2).
+Schedule::command('model:prune', ['--model' => [FailedLoginTally::class, ContactMessage::class, ActivityEvent::class, ApiUsageLog::class]])
     ->dailyAt('04:05')
     ->withoutOverlapping(30)
     ->runInBackground()
-    ->onFailure($alertOnFailure('model:prune failed_login_tallies, contact_messages'));
+    ->onFailure($alertOnFailure('model:prune failed_login_tallies, contact_messages, activity_events, api_usage_logs'));
 
 // Fehlgeschlagene Jobs nach 30 Tagen entfernen (täglich 03:55). Bis dahin
 // sind sie im Systemstatus sichtbar und per `queue:retry` wiederholbar.
diff --git a/tests/Feature/Monitoring/LogRetentionTest.php b/tests/Feature/Monitoring/LogRetentionTest.php
new file mode 100644
index 00000000..d1f459e2
--- /dev/null
+++ b/tests/Feature/Monitoring/LogRetentionTest.php
@@ -0,0 +1,74 @@
+<?php
+
+use App\Enums\ActivityType;
+use App\Models\ActivityEvent;
+use App\Models\ApiUsageLog;
+use Illuminate\Console\Scheduling\Schedule;
+use Tests\TestCase;
+
+/**
+ * Löschfristen von Aktivitäts-Verlauf und API-Zugriffsprotokoll
+ * (Roadmap 4.2, config monitoring.retention).
+ */
+function activityEventAt(int $daysAgo): ActivityEvent
+{
+    return ActivityEvent::create([
+        'type' => ActivityType::UserLoggedIn,
+        'occurred_at' => now()->subDays($daysAgo),
+        'description' => 'Anmeldung',
+    ]);
+}
+
+function apiUsageLogAt(int $daysAgo): ApiUsageLog
+{
+    return ApiUsageLog::create([
+        'method' => 'GET',
+        'path' => 'api/v1/press-releases',
+        'status_code' => 200,
+        'ip_address' => '203.0.113.7',
+        'requested_at' => now()->subDays($daysAgo),
+    ]);
+}
+
+test('activity events are pruned after 395 days', function () {
+    /** @var TestCase $this */
+    $old = activityEventAt(396);
+    $recent = activityEventAt(394);
+
+    $this->artisan('model:prune', ['--model' => [ActivityEvent::class]])->assertSuccessful();
+
+    $this->assertModelMissing($old);
+    $this->assertModelExists($recent);
+});
+
+test('api usage logs are pruned after 90 days', function () {
+    /** @var TestCase $this */
+    $old = apiUsageLogAt(91);
+    $recent = apiUsageLogAt(89);
+
+    $this->artisan('model:prune', ['--model' => [ApiUsageLog::class]])->assertSuccessful();
+
+    $this->assertModelMissing($old);
+    $this->assertModelExists($recent);
+});
+
+test('the retention periods follow the configuration', function () {
+    /** @var TestCase $this */
+    config()->set('monitoring.retention.activity_events_days', 30);
+    config()->set('monitoring.retention.api_usage_logs_days', 7);
+    $event = activityEventAt(31);
+    $log = apiUsageLogAt(8);
+
+    $this->artisan('model:prune', ['--model' => [ActivityEvent::class, ApiUsageLog::class]])->assertSuccessful();
+
+    $this->assertModelMissing($event);
+    $this->assertModelMissing($log);
+});
+
+test('the daily prune run covers both logs', function () {
+    $command = collect(app(Schedule::class)->events())
+        ->map(fn ($event) => (string) $event->command)
+        ->first(fn (string $command) => str_contains($command, 'model:prune'));
+
+    expect($command)->toContain('ActivityEvent')->toContain('ApiUsageLog');
+});