fix: reassemble inbound CMPP long messages

api/prisma/schema.prisma

@@ -47,6 +47,7 @@ model Tenant {
   gatewaySubmitDeadLetters GatewaySubmitDeadLetter[]
   openApiRequests        OpenApiRequest[]
   httpWebhookEvents      HttpWebhookEvent[]
+  cmppInboundLongMessages CmppInboundLongMessage[]
 }
 
 model EnterpriseCertification {
@@ -400,6 +401,7 @@ model SmsApplication {
   httpWebhookEndpoints    HttpWebhookEndpoint[]
   httpWebhookEvents       HttpWebhookEvent[]
   dailyUsages             SmsApplicationDailyUsage[]
+  inboundLongMessages     CmppInboundLongMessage[]
 
   @@index([tenantId, status])
 }
@@ -1541,6 +1543,49 @@ model SmsMessageSegmentAudit {
   @@index([submitStatus, receiptStatus])
 }
 
+model CmppInboundLongMessage {
+  id              String   @id @default(cuid())
+  tenantId        String
+  applicationId   String
+  groupKey        String
+  account         String
+  srcId           String?
+  phoneNumbers    Json
+  concatReference Int
+  segmentTotal    Int
+  msgFmt          Int
+  messageId       String   @unique
+  status          String   @default("collecting")
+  response        Json?
+  expiresAt       DateTime
+  completedAt     DateTime?
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+
+  tenant      Tenant                         @relation(fields: [tenantId], references: [id])
+  application SmsApplication                 @relation(fields: [applicationId], references: [id], onDelete: Cascade)
+  segments    CmppInboundLongMessageSegment[]
+
+  @@index([groupKey, status, createdAt])
+  @@index([applicationId, status, expiresAt])
+}
+
+model CmppInboundLongMessageSegment {
+  id              String   @id @default(cuid())
+  groupId         String
+  segmentIndex    Int
+  sequenceId      String?
+  content         String
+  contentHash     String
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+
+  group CmppInboundLongMessage @relation(fields: [groupId], references: [id], onDelete: Cascade)
+
+  @@unique([groupId, segmentIndex])
+  @@index([sequenceId])
+}
+
 model SmsReceiptRecord {
   id               String   @id @default(cuid())
   tenantId         String?