Schema Workshop Scenarios

$MIGRATION_DIR/
├── heroku-resource-inventory.json   # FROZEN — workshop never rewrites
├── preferences.json                 # active scenario preferences
├── aws-design.json                  # active scenario design
├── estimation-infra.json            # active scenario estimate
└── scenarios/
    ├── index.json
    ├── scenario-001.json            # manifest (baseline)
    ├── scenario-001.preferences.json
    ├── scenario-001.aws-design.json
    ├── scenario-001.estimation-infra.json
    └── …

"workshop": {
  "active": true,
  "cpu_architecture": "x86_64",
  "last_sheet_at": "2026-07-19T20:00:00Z",
  "active_scenario_id": "scenario-002"
}

{
  "baseline_scenario_id": "scenario-001",
  "active_scenario_id": "scenario-002",
  "max_scenarios": 5,
  "inventory_fingerprint": "<sha256 hex of heroku-resource-inventory.json>",
  "scenarios": [
    {
      "scenario_id": "scenario-001",
      "label": "baseline",
      "created_at": "2026-07-19T19:00:00Z",
      "source": "baseline",
      "manifest": "scenarios/scenario-001.json"
    }
  ]
}

{
  "scenario_id": "scenario-003",
  "label": "arm64 + multi-az",
  "created_at": "2026-07-19T20:15:00Z",
  "source": "workshop",
  "preferences_subset": {
    "global.target_region": "us-west-2",
    "workshop.cpu_architecture": "arm64"
  },
  "preferences_fingerprint": "<sha256 of preferences.json>",
  "aws_design_fingerprint": "<sha256 of aws-design.json>",
  "estimation_summary": {
    "aws_monthly_premium": 0,
    "aws_monthly_balanced": 0,
    "aws_monthly_optimized": 0,
    "complexity_tier": "small",
    "pricing_source": "cached",
    "region_note": null,
    "calculator_url": null
  },
  "paths": {
    "preferences": "scenarios/scenario-003.preferences.json",
    "aws_design": "scenarios/scenario-003.aws-design.json",
    "estimation_infra": "scenarios/scenario-003.estimation-infra.json"
  }
}