Implement SvelteKit webhook relay with SSE, auth, and real-time features

Co-authored-by: lukeslakemail <lukeslakemail@gmail.com>

sveltekit-integration/prisma/schema.prisma

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+// This is your Prisma schema file,
+// learn more about it in the docs: https://pris.ly/d/prisma-schema
+
+generator client {
+  provider = "prisma-client-js"
+}
+
+datasource db {
+  provider = "postgresql"
+  url      = env("DATABASE_URL")
+}
+
+model User {
+  id            String          @id @default(cuid())
+  email         String          @unique
+  subdomain     String          @unique
+  name          String?
+  username      String          @unique
+  image         String?
+  emailVerified DateTime?
+  accounts      Account[]
+  sessions      Session[]
+  relayTargets  RelayTarget[]
+  webhookEvents WebhookEvent[]
+
+  // Optional for WebAuthn support
+  Authenticator Authenticator[]
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model Account {
+  userId            String
+  type              String
+  provider          String
+  providerAccountId String
+  refresh_token     String?
+  access_token      String?
+  expires_at        Int?
+  token_type        String?
+  scope             String?
+  id_token          String?
+  session_state     String?
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@id([provider, providerAccountId])
+}
+
+model Session {
+  sessionToken String   @unique
+  userId       String
+  expires      DateTime
+  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  createdAt DateTime @default(now())
+  updatedAt DateTime @updatedAt
+}
+
+model VerificationToken {
+  identifier String
+  token      String
+  expires    DateTime
+
+  @@id([identifier, token])
+}
+
+// Optional for WebAuthn support
+model Authenticator {
+  credentialID         String  @unique
+  userId               String
+  providerAccountId    String
+  credentialPublicKey  String
+  counter              Int
+  credentialDeviceType String
+  credentialBackedUp   Boolean
+  transports           String?
+
+  user User @relation(fields: [userId], references: [id], onDelete: Cascade)
+
+  @@id([userId, credentialID])
+}
+
+// Webhook Event schema
+model WebhookEvent {
+  id        String   @id @default(cuid())
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  userId    String
+  path      String
+  query     String
+  method    String
+  body      String
+  headers   String
+  createdAt DateTime @default(now())
+
+  @@index([userId, createdAt])
+}
+
+// Webhook Relay Target schema
+model RelayTarget {
+  id        String   @id @default(cuid())
+  user      User     @relation(fields: [userId], references: [id], onDelete: Cascade)
+  userId    String
+  target    String
+  nickname  String?
+  createdAt DateTime @default(now())
+  active    Boolean  @default(true)
+
+  @@index([userId, active])
+}