ST-cmovs79lt: Schema + migratie PushSubscription model

Voeg PushSubscription model toe aan prisma/schema.prisma met
snake_case-conventie, relation field op User, en bijbehorende
migratie (push_subscriptions tabel, FK + index op user_id).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

prisma/migrations/20260507200000_add_push_subscriptions/migration.sql

@@ -0,0 +1,20 @@
+-- PushSubscription model for Web Push notifications (PBI-55)
+
+CREATE TABLE "push_subscriptions" (
+    "id" TEXT NOT NULL,
+    "user_id" TEXT NOT NULL,
+    "endpoint" TEXT NOT NULL,
+    "p256dh" TEXT NOT NULL,
+    "auth" TEXT NOT NULL,
+    "user_agent" TEXT,
+    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "last_used_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+
+    CONSTRAINT "push_subscriptions_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "push_subscriptions_endpoint_key" ON "push_subscriptions"("endpoint");
+
+CREATE INDEX "push_subscriptions_user_id_idx" ON "push_subscriptions"("user_id");
+
+ALTER TABLE "push_subscriptions" ADD CONSTRAINT "push_subscriptions_user_id_fkey" FOREIGN KEY ("user_id") REFERENCES "users"("id") ON DELETE CASCADE ON UPDATE CASCADE;

prisma/schema.prisma

@@ -164,6 +164,7 @@ model User {
   claude_jobs         ClaudeJob[]
   claude_workers      ClaudeWorker[]
   started_sprint_runs SprintRun[]      @relation("SprintRunStartedBy")
+  push_subscriptions  PushSubscription[]
 
   @@index([active_product_id])
   @@map("users")
@@ -624,3 +625,18 @@ model ClaudeQuestion {
   @@index([status, expires_at])
   @@map("claude_questions")
 }
+
+model PushSubscription {
+  id           String   @id @default(cuid())
+  user         User     @relation(fields: [user_id], references: [id], onDelete: Cascade)
+  user_id      String
+  endpoint     String   @unique
+  p256dh       String
+  auth         String
+  user_agent   String?
+  created_at   DateTime @default(now())
+  last_used_at DateTime @default(now())
+
+  @@index([user_id])
+  @@map("push_subscriptions")
+}