type MaybeMeasurement = Double?

pub(all) enum AlertSeverity {
  Info
  Warning
  Critical
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct AttributePoint {
  index : Int
  rate : Double
  center : Double
  lower : Double
  upper : Double
  alarm : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct AuditEvent {
  event_id : String
  lot_id : String
  actor : String
  action : String
  timestamp : String
  passed : Bool
  evidence : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct BacktestPoint {
  index : Int
  actual : Double
  predicted : Double
  error : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct Baseline {
  center : Double
  deviation : Double
  lower : Double
  upper : Double
  count : Int
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct CUSUMStream {
  target : Double
  allowance : Double
  decision : Double
  positive : Double
  negative : Double
  steps : Int
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct Capability {
  mean : Double
  standard_deviation : Double
  cp : Double
  cpk : Double
  pp : Double
  ppk : Double
  out_of_spec_rate : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct CapabilityExtended {
  cp : Double
  cpk : Double
  cpu : Double
  cpl : Double
  ppm_upper : Double
  ppm_lower : Double
  yield_rate : Double
  sigma_level : Double
  capable : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum CapabilityResult {
  CapabilityOk(Capability)
  CapabilityInvalidInput(message~ : String)
} derive(
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct CategoryCount {
  category : String
  count : Int
  proportion : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct ChartPoint {
  value : Double
  center : Double
  upper : Double
  lower : Double
  out_of_control : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum ChartResult {
  ChartOk(ControlChart)
  ChartInvalidInput(message~ : String)
} derive(
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct CleanIssue {
  index : Int
  code : String
  message : String
  original : Double?
  replacement : Double?
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct CleanResult {
  values : Array[Double]
  original_count : Int
  removed : Int
  replaced : Int
  issues : Array[CleanIssue]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct ContractResult {
  valid : Bool
  row_count : Int
  missing_fields : Array[String]
  missing_rate : Double
  duplicate_keys : Int
  reasons : Array[String]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct ControlChart {
  kind : String
  center : Double
  points : Array[ChartPoint]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct CountPoint {
  index : Int
  count : Int
  center : Double
  lower : Double
  upper : Double
  alarm : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DashboardCard {
  key : String
  title : String
  value : Double
  target : Double
  unit : String
  trend : Int
  status : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DashboardSnapshot {
  name : String
  generated_at : String
  cards : Array[DashboardCard]
  alerts : Int
  score : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DataContract {
  name : String
  required_fields : Array[String]
  minimum_rows : Int
  maximum_missing_rate : Double
  unique_key : String
  version : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DiagnosticResult {
  sample_count : Int
  mean : Double
  deviation : Double
  runs : Int
  increasing_pairs : Int
  decreasing_pairs : Int
  change_index : Int
  shift : Double
  variance_ratio : Double
  autocorrelation : Double
  stable : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DistributionSummary {
  count : Int
  mean : Double
  deviation : Double
  median : Double
  mad : Double
  skewness : Double
  kurtosis : Double
  normality_score : Double
  approximately_normal : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct DriftPoint {
  index : Int
  value : Double
  score : Double
  alarm : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct EWMAStep {
  value : Double
  center : Double
  alarm : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct EWMAStream {
  lambda : Double
  state : Double
  center : Double
  limit : Double
  steps : Int
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct FailureMode {
  id : String
  process : String
  cause : String
  effect : String
  severity : Int
  occurrence : Int
  detection : Int
  owner : String
  mitigation : String
  closed : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct ForecastResult {
  strategy_name : String
  horizon : Int
  values : Array[Double]
  baseline : Double
  deviation : Double?
  lower : Array[Double]
  upper : Array[Double]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum ForecastStrategy {
  LastValue
  MeanValue
  MovingAverage(Int)
  TrendLine
  ExponentialAverage(Double)
} derive(Eq, ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct Frequency {
  value : Int
  count : Int
  proportion : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct GateDecision {
  released : Bool
  score : Double
  blockers : Array[String]
  recommendation : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct GaugeStudy {
  readings : Array[Double]
  reference : Double
  repeatability : Double
  bias : Double
  resolution : Double
  percent_tolerance : Double
  adequate : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct HistogramBin {
  lower : Double
  upper : Double
  count : Int
  proportion : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct LotFeature {
  identity : LotIdentity
  feature : String
  values : Array[Double]
  missing : Int
  stations : Array[String]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct LotFeatureSummary {
  lot : String
  feature : String
  count : Int
  missing : Int
  mean : Double?
  deviation : Double?
  minimum : Double?
  maximum : Double?
  defect_rate : Double?
  station_count : Int
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct LotIdentity {
  lot : String
  product : String
  revision : String
  line : String
  shift : String
  start_window : String
  end_window : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct MaintenancePlan {
  asset_id : String
  interval_days : Int
  last_service_day : Int
  next_service_day : Int
  runtime_hours : Double
  runtime_limit : Double
  open_actions : Int
  status : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct MaintenanceRecord {
  asset : String
  event : String
  timestamp : String
  runtime_hours : Double
  severity : Int
  note : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct MaterialLot {
  material_id : String
  lot_id : String
  quantity : Double
  reserved : Double
  lower_limit : Double
  upper_limit : Double
  status : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct MatrixValidation {
  valid : Bool
  rows : Int
  columns : Int
  issues : Array[String]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct MeasurementEvent {
  identity : LotIdentity
  station : String
  feature : String
  value : Double?
  sequence : Int
  accepted : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct MeasurementMatrix {
  rows : Array[Array[Double]]
  feature_names : Array[String]
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct MeasurementRing {
  capacity : Int
  values : Array[Double]
  next : Int
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct MetricCatalog {
  metrics : Array[QualityMetric]
  version : String
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct MultivariateAlarm {
  row : Int
  score : Double
  threshold : Double
  alarm : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct ParetoRow {
  category : String
  count : Int
  proportion : Double
  cumulative : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct PolicyDecision {
  accepted : Bool
  warning : Bool
  critical : Bool
  reason : String
  score : Double
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) struct ProcessScenario {
  name : String
  center : Double
  deviation : Double
  lower : Double?
  upper : Double?
  drift : Double
  outlier_probability : Double
  seed : Int
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)

pub struct ProductionStage {
  name : String
  duration_hours : Double
  required_station : String
  sequence : Int
  completed : Bool
} derive(ToJson, 
@moonbitlang/core/debug.Debug
Debug)