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Terraform for iPadOS 26 App Backends and Stage Manager Sync

Provision iPadOS 26 backends with Terraform: AppSync, multi-window CRDT sync, file provider integration, and Apple Pencil stroke storage.

LLuca Berton1 min read

iPadOS 26 sharpens multitasking, Stage Manager, and external display flows. Pro iPad apps need sync that survives multi-window edits and offline writes. Terraform provisions the same backbone as iOS — Cognito, AppSync, S3 — plus a sync-conflict store (DynamoDB with optimistic concurrency, or AppSync's built-in conflict detection).

Quick Pattern (TL;DR)

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Same Cognito + AppSync pattern as iOS, with conflict resolution turned on:

resource "aws_appsync_graphql_api" "ipad" {
  name                = "ipad-api"
  authentication_type = "AMAZON_COGNITO_USER_POOLS"
 
  user_pool_config {
    user_pool_id   = aws_cognito_user_pool.ios.id
    aws_region     = var.region
    default_action = "ALLOW"
  }
 
  schema = file("${path.module}/schema.graphql")
}
 
resource "aws_appsync_resolver" "doc_update" {
  api_id      = aws_appsync_graphql_api.ipad.id
  type        = "Mutation"
  field       = "updateDoc"
  data_source = aws_appsync_datasource.docs.name
 
  sync_config {
    conflict_detection = "VERSION"
    conflict_handler   = "AUTOMERGE"
  }
}

DynamoDB With Versioning

# 
resource "aws_dynamodb_table" "docs" {
  name         = "ipad_docs"
  billing_mode = "PAY_PER_REQUEST"
  hash_key     = "doc_id"
 
  attribute {
    name = "doc_id"
    type = "S"
  }
 
  point_in_time_recovery { enabled = true }
}

Apple Pencil Stroke Storage on S3

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Stroke vectors compress badly as JSON; store as protobuf chunks in S3 with content-addressed keys:

resource "aws_s3_bucket" "strokes" {
  bucket = "ipad-strokes"
}
 
resource "aws_s3_bucket_intelligent_tiering_configuration" "strokes" {
  bucket = aws_s3_bucket.strokes.id
  name   = "tier-old-strokes"
 
  tiering {
    access_tier = "ARCHIVE_ACCESS"
    days        = 90
  }
}

Best Practices

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  • Use AppSync AUTOMERGE conflict resolution — purpose-built for sync apps.
  • Compact strokes server-side in a Lambda triggered by S3 notifications.
  • One AppSync per app, not per platform — iPad and iPhone share the same schema.
  • Test offline replay in CI before shipping — iPadOS apps stay offline longer than iOS phones.
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#Terraform#iPadOS 26#AWS#AppSync#Sync

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