{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://sediment.so/schemas/derived-artifacts/abandonment-summary/v1.json",
  "title": "AbandonmentSummary",
  "description": "One abandonment coverage summary.",
  "type": "object",
  "properties": {
    "abandoned_sessions": {
      "type": "integer",
      "description": "All sessions derived as abandoned, including implicit-only sessions."
    },
    "grade_eligible_sessions": {
      "type": "integer",
      "description": "Abandoned sessions with at least one explicit accepted decision."
    },
    "implicit_only_sessions": {
      "type": "integer",
      "description": "Abandoned sessions whose accepted decisions were all implicit."
    },
    "negative_completions": {
      "type": "integer",
      "description": "Abandonment-evidence attributed completions emitted for training."
    },
    "explicit_accepts_unjoined": {
      "type": "integer",
      "description": "Explicit accepted decision facts that could not join uniquely to a completion."
    },
    "derivation_skipped": {
      "type": "object",
      "additionalProperties": {
        "type": "integer"
      },
      "description": "Candidate counts by the abandonment derivation's closed skip reasons."
    },
    "provenance": {
      "anyOf": [
        {
          "$ref": "#/$defs/Provenance"
        },
        {
          "type": "null"
        }
      ],
      "description": "The structured provenance for this artifact."
    }
  },
  "additionalProperties": false,
  "required": [
    "abandoned_sessions",
    "grade_eligible_sessions",
    "implicit_only_sessions",
    "negative_completions",
    "explicit_accepts_unjoined",
    "derivation_skipped",
    "provenance"
  ],
  "$defs": {
    "Provenance": {
      "type": "object",
      "properties": {
        "policy_version": {
          "type": "string",
          "description": "The derivation implementation policy version."
        },
        "quarantine_revision": {
          "type": "integer",
          "description": "The integer quarantine-log high-water mark used for the derivation."
        },
        "policy_digest": {
          "anyOf": [
            {
              "type": "string"
            },
            {
              "type": "null"
            }
          ],
          "description": "SHA-256 of the fully resolved derivation policy when available."
        }
      },
      "additionalProperties": false,
      "required": [
        "policy_version",
        "quarantine_revision",
        "policy_digest"
      ]
    }
  }
}