{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "object",
  "required": ["metric-contract", "dataset-snapshot", "analysis-run", "findings", "limitations"],
  "properties": {
    "metric-contract": {
      "type": "object",
      "required": ["metric-id", "version", "grain", "numerator", "denominator", "unit", "timezone", "observation-window", "source-fields"],
      "properties": {
        "metric-id": {"type": "string", "minLength": 1}, "version": {"type": "string", "minLength": 1},
        "grain": {"type": "string", "minLength": 1}, "numerator": {"type": "string", "minLength": 1},
        "denominator": {"type": "string", "minLength": 1}, "unit": {"type": "string", "minLength": 1},
        "timezone": {"type": "string", "minLength": 1}, "observation-window": {"type": "string", "minLength": 1},
        "source-fields": {"type": "array", "minItems": 1}
      }
    },
    "dataset-snapshot": {
      "type": "object",
      "required": ["snapshot-id", "path", "sha256", "schema-version", "row-count", "as-of", "classification"],
      "properties": {
        "snapshot-id": {"type": "string", "minLength": 1}, "path": {"type": "string", "minLength": 1},
        "sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"}, "schema-version": {"type": "string"},
        "row-count": {"type": "integer", "minimum": 1}, "as-of": {"type": "string", "minLength": 1},
        "classification": {"enum": ["public", "internal", "confidential", "restricted"]}
      }
    },
    "analysis-run": {
      "type": "object",
      "required": ["query-sha256", "environment", "result-sha256", "evidence-receipt-ids"],
      "properties": {
        "query-sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
        "environment": {"type": "string", "minLength": 1},
        "result-sha256": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
        "evidence-receipt-ids": {"type": "array", "minItems": 1, "items": {"type": "string"}}
      }
    },
    "findings": {"type": "array", "minItems": 1},
    "limitations": {"type": "array"}
  }
}