# AWS Organization Restructuring - Changes Summary

## Overview
Successfully simplified the AWS Organization structure from nested OUs to a flat structure, reducing complexity and improving maintainability.

## Changes Made

### 1. StackSet Reduction (7 → 3)
**Deleted:**
- `stacksets/05-account-notifications/` - Redundant with Control Tower events
- `stacksets/07-backup-strategy/` - Use Control Tower's AWS Backup instead

**Kept for Auto-deployment:**
- `01-pipeline-bootstrap` - S3 bucket for deployments
- `02-github-oidc` - GitHub Actions authentication
- `04-cost-management` - Budget alerts

**Marked for Manual Deployment:**
- `03-monitoring` - Deploy when applications exist
- `06-log-aggregation` - Deploy when logs need centralization

### 2. OU Structure Simplification
**Before:**
```
Root
└── Workloads
    ├── Production (all StackSets)
    └── Staging (limited StackSets)
└── Sandbox (no StackSets)
```

**After:**
```
Root
├── Workloads (core StackSets + SCPs)
└── Sandbox (core StackSets, no SCPs)
```

### 3. Code Updates

#### Scripts Modified:
- **bootstrap.py**: Removed nested OU creation (lines 157-158, 124-133, 305)
- **deploy.py**: Deploy same 3 StackSets to both OUs (lines 329-331, 332-444)
- **status.py**: Display flat structure (lines 57-59, 126-129)

#### CLI Updates:
- **account.py**: Updated example to use "Workloads" (line 52)
- **ou.py**: Updated example to use "Workloads" (line 131)
- **account_factory.py**: Updated OU name examples (lines 99, 148)

#### Test Updates:
- **conftest.py**: Removed Production/Staging mocks (lines 33-39)
- **test_cli_integration.py**: Updated OU references (line 38)
- **test_account_commands.py**: Updated OU references (line 117)

#### Documentation Updates:
- **README.md**: Updated architecture description and examples
- **CLAUDE.md**: Updated OU hierarchy and StackSet descriptions
- Created `MANUAL_DEPLOY.md` files for monitoring and log-aggregation

### 4. Deployment Strategy Changes

**Auto-deployed to ALL accounts (Workloads + Sandbox):**
1. GitHub OIDC authentication
2. Pipeline S3 bucket
3. Cost management/budgets

**SCPs applied only to Workloads OU:**
- Region restrictions (us-east-1, us-west-2)
- No IAM user creation
- Security baselines

**Sandbox remains unrestricted** for experimentation

## Testing Results
- ✅ All 31 unit tests passing
- ✅ Linting checks pass
- ✅ Integration tests verified

## Benefits Achieved
1. **Simplicity**: Flat OU structure, fewer moving parts
2. **Flexibility**: Same tools in all accounts
3. **Maintainability**: Less code, fewer edge cases
4. **Reliability**: Reduced failure points
5. **Cost Efficiency**: Only essential StackSets auto-deploy

## Next Steps
1. Create Workloads OU manually in AWS Console
2. Run `make deploy` to apply changes
3. Test with a new account creation
4. Move any existing accounts to appropriate OUs

## Rollback Plan
If issues occur:
- StackSets can be deleted via AWS Console
- SCPs can be detached without affecting accounts
- Control Tower baseline remains intact
- No data or applications affected
