{
  "contract_version": "1.0",
  "runtime_exposure": "unexposed",
  "policy": {
    "breaking_changes": ["remove_required_key", "change_required_type", "change_required_structure"],
    "additive_changes": ["add_optional_field"]
  },
  "scopes": {
    "health": {
      "required": {
        "success": "bool",
        "server": "str",
        "db_path": "str",
        "schema_version": "str",
        "active_transactions": "int"
      }
    },
    "status": {
      "required": {
        "success": "bool",
        "db_path": "str",
        "exists": "bool",
        "size_bytes": "int",
        "mtime": "str",
        "table_counts": {"type": "dict", "required": {"accounts": "int", "transactions": "int"}},
        "aggregate_totals": {"type": "dict", "required": {"month": "str", "by_cashflow_kind": "dict"}}
      }
    },
    "list": {
      "required": {
        "success": "bool",
        "accounts": "list",
        "count": "int"
      },
      "items": {
        "accounts": {
          "required": {
            "id": "str",
            "name": "str",
            "type": "str",
            "institution": "str",
            "currency": "str",
            "active": "bool",
            "statement_status": "str",
            "liquidity_bucket": "str"
          }
        }
      }
    },
    "report": {
      "required": {
        "success": "bool",
        "month": "str",
        "income": "int",
        "expenses": "int",
        "net_cashflow": "int",
        "savings_rate": ["float", "none"],
        "by_type": "dict",
        "by_cashflow_kind": "dict"
      }
    },
    "mutation_success_envelope": {
      "required": {
        "success": "bool",
        "account": {"type": "dict", "required": {"id": "str", "name": "str", "type": "str", "active": "bool"}}
      }
    }
  }
}