feat: implement pwa push notifications

prisma/migrations/20260113074411_add_push_subscription/migration.sql

@@ -0,0 +1,13 @@
+-- CreateTable
+CREATE TABLE "PushSubscription" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "planId" TEXT NOT NULL,
+    "endpoint" TEXT NOT NULL,
+    "p256dh" TEXT NOT NULL,
+    "auth" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT "PushSubscription_planId_fkey" FOREIGN KEY ("planId") REFERENCES "Plan" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "PushSubscription_endpoint_key" ON "PushSubscription"("endpoint");

prisma/schema.prisma

@@ -21,6 +21,7 @@ model Plan {
   litterInterval Int     @default(2)
   createdAt    DateTime @default(now())
   bookings     Booking[]
+  pushSubscriptions PushSubscription[]
 }
 
 model Booking {
@@ -35,3 +36,13 @@ model Booking {
   
   @@unique([planId, date, sitterName])
 }
+
+model PushSubscription {
+  id        String   @id @default(cuid())
+  planId    String
+  plan      Plan     @relation(fields: [planId], references: [id], onDelete: Cascade)
+  endpoint  String   @unique
+  p256dh    String
+  auth      String
+  createdAt DateTime @default(now())
+}