feat(backend): add magicCooldownUntil to UserDevice

backend/prisma/migrations/20260616_add_magic_cooldown_until/migration.sql

@@ -0,0 +1,2 @@
+-- Add magicCooldownUntil for temporary sleep mode on Magic desktop devices
+ALTER TABLE "rebreak"."user_devices" ADD COLUMN "magic_cooldown_until" TIMESTAMP(3);

backend/prisma/schema.prisma

@@ -1105,6 +1105,8 @@ model UserDevice {
     /// Wann der User die Entfernung des Magic-Profils beantragt hat.
     /// Removal-Passwort wird erst nach +MAGIC_RELEASE_COOLDOWN_H sichtbar.
     magicReleaseRequestedAt DateTime? @map("magic_release_requested_at")
+    /// Temporärer Sleep-Mode für Magic-Desktop-Geräte. NULL = kein Cooldown aktiv.
+    magicCooldownUntil DateTime? @map("magic_cooldown_until")
 
     @@unique([userId, deviceId])
     @@index([userId])
@@ -1295,3 +1297,28 @@ model OauthPendingState {
     @@map("oauth_pending_states")
     @@schema("rebreak")
 }
+
+/// Client error / crash reports submitted by users or captured automatically.
+/// Intentionally minimal PII: no emails, passwords, tokens, or message content.
+/// Used for debugging during test phases and high-traffic rollouts.
+model ErrorReport {
+    id          String   @id @default(uuid()) @db.Uuid
+    source      String /// "native" | "magic" | "web" | "manual" | "auto"
+    severity    String /// "error" | "crash" | "warning" | "info"
+    title       String
+    message     String
+    stack       String?
+    context     Json? /// free-form structured context (screen, device info, etc.)
+    deviceInfo  Json? @map("device_info") /// platform, osVersion, appVersion, model
+    profileId   String?  @map("profile_id") @db.Uuid
+    /// Original client timestamp if provided, otherwise server time.
+    reportedAt  DateTime @map("reported_at")
+    createdAt   DateTime @default(now()) @map("created_at")
+
+    @@index([source])
+    @@index([severity])
+    @@index([createdAt])
+    @@index([profileId])
+    @@map("error_reports")
+    @@schema("rebreak")
+}