feat(WHE-22): ingest configured topic messages with idempotent persistence

apps/bot/src/index.ts

@@ -2,12 +2,37 @@ import { webhookCallback } from 'grammy'
 
 import { createTelegramBot } from './bot'
 import { getBotRuntimeConfig } from './config'
+import {
+  createPurchaseMessageRepository,
+  registerPurchaseTopicIngestion
+} from './purchase-topic-ingestion'
 import { createBotWebhookServer } from './server'
 
 const runtime = getBotRuntimeConfig()
 const bot = createTelegramBot(runtime.telegramBotToken)
 const webhookHandler = webhookCallback(bot, 'std/http')
 
+let closePurchaseRepository: (() => Promise<void>) | undefined
+
+if (runtime.purchaseTopicIngestionEnabled) {
+  const purchaseRepositoryClient = createPurchaseMessageRepository(runtime.databaseUrl!)
+  closePurchaseRepository = purchaseRepositoryClient.close
+
+  registerPurchaseTopicIngestion(
+    bot,
+    {
+      householdId: runtime.householdId!,
+      householdChatId: runtime.telegramHouseholdChatId!,
+      purchaseTopicId: runtime.telegramPurchaseTopicId!
+    },
+    purchaseRepositoryClient.repository
+  )
+} else {
+  console.warn(
+    'Purchase topic ingestion is disabled. Set DATABASE_URL, HOUSEHOLD_ID, TELEGRAM_HOUSEHOLD_CHAT_ID, and TELEGRAM_PURCHASE_TOPIC_ID to enable.'
+  )
+}
+
 const server = createBotWebhookServer({
   webhookPath: runtime.telegramWebhookPath,
   webhookSecret: runtime.telegramWebhookSecret,
@@ -23,6 +48,10 @@ if (import.meta.main) {
   console.log(
     `@household/bot webhook server started on :${runtime.port} path=${runtime.telegramWebhookPath}`
   )
+
+  process.on('SIGTERM', () => {
+    void closePurchaseRepository?.()
+  })
 }
 
 export { server }