feat: self-hosted postfix

prisma/schema.prisma

@@ -32,3 +32,20 @@ model News {
 
   @@map(name: "news")
 }
+
+model EmailLog {
+  id           Int      @id @default(autoincrement())
+  recipient    String
+  subject      String?
+  messageId    String?  @map("message_id")
+  status       String   // 'sent', 'failed', 'bounced'
+  sentAt       DateTime @default(now()) @map("sent_at")
+  errorMessage String?  @map("error_message")
+  bounceType   String?  @map("bounce_type")
+  bounceDetails Json?   @map("bounce_details")
+
+  @@index([recipient])
+  @@index([status])
+  @@index([sentAt])
+  @@map(name: "email_logs")
+}