{
  "schema_version": 1,
  "scenario": "subscription_churn_at_retention_decision",
  "seed": 20260730,
  "train_rows": 900,
  "test_rows": 300,
  "prediction_time": "2026-03-02T08:00:00Z",
  "suspect_feature": "plan_changes_to_date",
  "ground_truth": {
    "defect": "The running plan-change count includes the downgrade a customer makes while cancelling, recorded after the retention decision.",
    "safe_reconstruction": "Keep only plan-change observations recorded at or before decided_at.",
    "safe_control": "support_tickets_90d is strongly predictive and entirely pre-decision."
  },
  "collapse_rule": {
    "minimum_observed_advantage": 0.05,
    "maximum_advantage_retained": 0.5,
    "rationale": "A collapse means a strict majority of the observed advantage came from records that did not exist at the decision."
  },
  "safe_control_rule": {
    "minimum_ablation_delta": 0.02
  },
  "audit_evidence": {
    "decision_node": "retention_decisions.decided_at",
    "leakage_case_id": "churn-post-decision-plan-change",
    "safe_case_id": "churn-support-tickets-safe-control",
    "leakage_model_urn": "urn:li:mlModel:(urn:li:dataPlatform:mlflow,acme.churn_v3_leaky,PROD)",
    "safe_model_urn": "urn:li:mlModel:(urn:li:dataPlatform:mlflow,acme.churn_v4_safe,PROD)",
    "leakage_feature_urn": "urn:li:schemaField:(acme.churn_features,plan_changes_to_date)",
    "safe_feature_urn": "urn:li:schemaField:(acme.churn_features,support_tickets_90d)",
    "leakage_lineage_path": [
      "plan_change_history.recorded_at",
      "churn_features.plan_changes_to_date"
    ],
    "safe_lineage_path": [
      "retention_decisions.support_tickets_90d",
      "churn_features.support_tickets_90d"
    ],
    "leakage_available_offset_days": 14,
    "safe_available_offset_days": -2
  },
  "point_in_time_adapter": {
    "kind": "files",
    "applications": {
      "path": "retention_decisions.csv",
      "format": "csv"
    },
    "feature_records": {
      "path": "plan_change_history.csv",
      "format": "csv"
    },
    "columns": {
      "entity_id": "subscriber_key",
      "prediction_time": "decided_at",
      "label": "churned_within_90d",
      "split": "eval_split",
      "base_features": ["tenure_months", "monthly_spend_usd"],
      "safe_feature": "support_tickets_90d",
      "record_entity_id": "subscriber",
      "available_time": "recorded_at",
      "feature_value": "plan_changes_to_date"
    }
  }
}