feat: implement 4 major features (#461, #462, #463, #464)

backend/prisma/schema.prisma

@@ -1225,3 +1225,173 @@ model BridgeRetry {
   @@index([messageId])
   @@map("bridge_retries")
 }
+
+// ─── Issue #462: Webhook Subscription Manager ───────────────────────────────────
+
+model WebhookSubscription {
+  id            String   @id @default(uuid())
+  tenantId      String   @map("tenant_id")
+  eventTypes    String[] @map("event_types")
+  filterExpr    String?  @map("filter_expr")
+  targetUrl     String   @map("target_url")
+  description   String?
+  status        SubscriptionStatus @default(active)
+  version       Int      @default(1) @map("version")
+  lastDelivered DateTime? @map("last_delivered")
+  deliveryCount Int      @default(0) @map("delivery_count")
+  successCount  Int      @default(0) @map("success_count")
+  failCount     Int      @default(0) @map("fail_count")
+  avgLatency    Float?   @map("avg_latency")
+  pausedAt      DateTime? @map("paused_at")
+  createdAt     DateTime @default(now()) @map("created_at")
+  updatedAt     DateTime @updatedAt @map("updated_at")
+  deletedAt     DateTime? @map("deleted_at")
+
+  deliveries WebhookSubscriptionDelivery[]
+
+  @@index([tenantId])
+  @@index([status])
+  @@index([tenantId, status])
+  @@map("webhook_subscriptions")
+}
+
+model WebhookSubscriptionDelivery {
+  id             String   @id @default(uuid())
+  subscriptionId String   @map("subscription_id")
+  eventType      String   @map("event_type")
+  payload        Json
+  status         DeliveryStatus @default(pending)
+  statusCode     Int?     @map("status_code")
+  latencyMs      Int?     @map("latency_ms")
+  errorMessage   String?  @map("error_message")
+  attemptCount   Int      @default(0) @map("attempt_count")
+  createdAt      DateTime @default(now()) @map("created_at")
+  completedAt    DateTime? @map("completed_at")
+
+  subscription WebhookSubscription @relation(fields: [subscriptionId], references: [id], onDelete: Cascade)
+
+  @@index([subscriptionId])
+  @@index([status])
+  @@index([createdAt])
+  @@map("webhook_subscription_deliveries")
+}
+
+// ─── Issue #463: Revenue Sharing Pool ───────────────────────────────────────────
+
+model RevenuePool {
+  id        String   @id @default(uuid())
+  tenantId  String   @map("tenant_id")
+  name      String
+  chain     String   @default("soroban")
+  contractId String  @map("contract_id")
+  status    PoolStatus @default(active)
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+  deletedAt DateTime? @map("deleted_at")
+
+  recipients   RevenueRecipient[]
+  distributions RevenueDistribution[]
+
+  @@index([tenantId])
+  @@map("revenue_pools")
+}
+
+model RevenueRecipient {
+  id          String   @id @default(uuid())
+  poolId      String   @map("pool_id")
+  wallet      String
+  ratioBps    Int      @map("ratio_bps")
+  accumulated String   @default("0") @map("accumulated")
+  createdAt   DateTime @default(now()) @map("created_at")
+  updatedAt   DateTime @updatedAt @map("updated_at")
+
+  pool RevenuePool @relation(fields: [poolId], references: [id], onDelete: Cascade)
+
+  @@unique([poolId, wallet])
+  @@map("revenue_recipients")
+}
+
+model RevenueDistribution {
+  id        String   @id @default(uuid())
+  poolId    String   @map("pool_id")
+  txHash    String   @map("tx_hash")
+  amount    String   @map("amount")
+  status    DistributionStatus @default(pending)
+  createdAt DateTime @default(now()) @map("created_at")
+
+  pool RevenuePool @relation(fields: [poolId], references: [id], onDelete: Cascade)
+
+  @@index([poolId])
+  @@map("revenue_distributions")
+}
+
+// ─── Issue #464: EVM Paymaster / ERC-4337 ───────────────────────────────────────
+
+model PaymasterBudget {
+  id        String   @id @default(uuid())
+  tenantId  String   @map("tenant_id")
+  chainId   Int      @map("chain_id")
+  token     String
+  balance   String   @default("0")
+  totalDeposited  String @default("0") @map("total_deposited")
+  totalUsed      String @default("0") @map("total_used")
+  maxGasPerTx    String? @map("max_gas_per_tx")
+  createdAt DateTime @default(now()) @map("created_at")
+  updatedAt DateTime @updatedAt @map("updated_at")
+
+  @@unique([tenantId, chainId, token])
+  @@map("paymaster_budgets")
+}
+
+model UserOperation {
+  id          String   @id @default(uuid())
+  userOpHash  String   @unique @map("user_op_hash")
+  sender      String
+  nonce       String
+  paymaster   String
+  mode        String   @default("verifying")
+  actualGasCost String? @map("actual_gas_cost")
+  status      UserOpStatus @default(pending)
+  txHash      String?  @map("tx_hash")
+  errorMsg    String?  @map("error_msg")
+  createdAt   DateTime @default(now()) @map("created_at")
+  completedAt DateTime? @map("completed_at")
+
+  @@index([sender])
+  @@index([status])
+  @@index([createdAt])
+  @@map("user_operations")
+}
+
+// ─── New Enums ──────────────────────────────────────────────────────────────────
+
+enum SubscriptionStatus {
+  active
+  paused
+  disabled
+}
+
+enum DeliveryStatus {
+  pending
+  delivered
+  failed
+  retrying
+}
+
+enum PoolStatus {
+  active
+  paused
+  archived
+}
+
+enum DistributionStatus {
+  pending
+  completed
+  failed
+}
+
+enum UserOpStatus {
+  pending
+  completed
+  failed
+}