fix: close sms scheduling and billing gaps

api/prisma/schema.prisma

@@ -11,10 +11,12 @@ model Tenant {
   name      String
   code      String   @unique
   status    String   @default("active")
+  certificationStatus String @default("approved")
   createdAt DateTime @default(now())
   updatedAt DateTime @updatedAt
 
   users                 User[]
+  enterpriseCertifications EnterpriseCertification[]
   operationLogs         OperationLog[]
   fileObjects           FileObject[]
   enterpriseBlacklists  EnterpriseBlacklist[]
@@ -35,6 +37,28 @@ model Tenant {
   smsSubmitRecords      SmsSubmitRecord[]
   smsReceiptRecords     SmsReceiptRecord[]
   smsUplinkMessages     SmsUplinkMessage[]
+  cmppConnectionStates  CmppConnectionState[]
+}
+
+model EnterpriseCertification {
+  id              String   @id @default(cuid())
+  tenantId        String
+  companyName     String
+  licenseNo       String?
+  contactName     String?
+  contactPhone    String?
+  materials       Json?
+  status          String   @default("pending")
+  rejectReason    String?
+  reviewerId      String?
+  submittedAt     DateTime @default(now())
+  reviewedAt      DateTime?
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+
+  tenant Tenant @relation(fields: [tenantId], references: [id])
+
+  @@index([tenantId, status, createdAt])
 }
 
 model User {
@@ -449,10 +473,35 @@ model SmsChannel {
   submitRecords  SmsSubmitRecord[]
   receiptRecords SmsReceiptRecord[]
   uplinkMessages SmsUplinkMessage[]
+  connectionStates CmppConnectionState[]
 
   @@index([status])
 }
 
+model CmppConnectionState {
+  id                 String   @id @default(cuid())
+  tenantId           String?
+  channelId          String
+  connectionId       String
+  status             String   @default("disconnected")
+  desiredConnections Int      @default(1)
+  currentConnections Int      @default(0)
+  lastConnectedAt    DateTime?
+  lastDisconnectedAt DateTime?
+  lastHeartbeatAt    DateTime?
+  reconnectCount     Int      @default(0)
+  lastError          String?
+  updatedAt          DateTime @updatedAt
+  createdAt          DateTime @default(now())
+
+  tenant  Tenant?    @relation(fields: [tenantId], references: [id])
+  channel SmsChannel @relation(fields: [channelId], references: [id])
+
+  @@unique([channelId, connectionId])
+  @@index([tenantId, status])
+  @@index([channelId, status])
+}
+
 model SmsChannelGroup {
   id          String   @id @default(cuid())
   code        String   @unique
@@ -723,6 +772,8 @@ model SmsBatchTask {
   failedTotal    Int      @default(0)
   unknownTotal   Int      @default(0)
   timeoutTotal   Int      @default(0)
+  scheduledAt    DateTime?
+  canceledAt     DateTime?
   createdById    String?
   createdAt      DateTime @default(now())
   updatedAt      DateTime @updatedAt
@@ -737,6 +788,7 @@ model SmsBatchTask {
   receiptRecords SmsReceiptRecord[]
 
   @@index([tenantId, status, createdAt])
+  @@index([status, scheduledAt])
   @@index([applicationId, createdAt])
 }