优化路径，添加消息推送

prisma/migrations/20260417040955_add_message_urls_and_push_subscriptions/migration.sql

@@ -0,0 +1,35 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[publicId]` on the table `FamilyMessage` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- AlterTable
+ALTER TABLE "FamilyMessage" ADD COLUMN     "publicId" SERIAL NOT NULL;
+
+-- CreateTable
+CREATE TABLE "PushSubscription" (
+    "id" TEXT NOT NULL,
+    "caregiverId" TEXT NOT NULL,
+    "endpoint" TEXT NOT NULL,
+    "p256dh" TEXT NOT NULL,
+    "auth" TEXT NOT NULL,
+    "expirationTime" TIMESTAMP(3),
+    "userAgent" TEXT,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "PushSubscription_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "PushSubscription_endpoint_key" ON "PushSubscription"("endpoint");
+
+-- CreateIndex
+CREATE INDEX "PushSubscription_caregiverId_updatedAt_idx" ON "PushSubscription"("caregiverId", "updatedAt" DESC);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "FamilyMessage_publicId_key" ON "FamilyMessage"("publicId");
+
+-- AddForeignKey
+ALTER TABLE "PushSubscription" ADD CONSTRAINT "PushSubscription_caregiverId_fkey" FOREIGN KEY ("caregiverId") REFERENCES "CaregiverAccount"("id") ON DELETE CASCADE ON UPDATE CASCADE;

prisma/schema.prisma

@@ -53,6 +53,7 @@ model CaregiverAccount {
   updatedAt    DateTime        @updatedAt
   bindings     DeviceBinding[]
   messages     FamilyMessage[]
+  pushSubscriptions PushSubscription[]
 }
 
 model ElderDevice {
@@ -84,6 +85,7 @@ model DeviceBinding {
 
 model FamilyMessage {
   id                String            @id @default(cuid())
+  publicId          Int               @unique @default(autoincrement())
   elderDeviceId     String
   caregiverId       String?
   direction         MessageDirection
@@ -102,6 +104,21 @@ model FamilyMessage {
   @@index([direction, status, createdAt(sort: Desc)])
 }
 
+model PushSubscription {
+  id             String           @id @default(cuid())
+  caregiverId    String
+  endpoint       String           @unique
+  p256dh         String
+  auth           String
+  expirationTime DateTime?
+  userAgent      String?
+  createdAt      DateTime         @default(now())
+  updatedAt      DateTime         @updatedAt
+  caregiver      CaregiverAccount @relation(fields: [caregiverId], references: [id], onDelete: Cascade)
+
+  @@index([caregiverId, updatedAt(sort: Desc)])
+}
+
 model ConversationTurn {
   id            String           @id @default(cuid())
   elderDeviceId String