{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.vik.guru/a3-stacked-cube-atlas-expanded/0.2/coverage-ledger.schema.json",
  "title": "Deep Research Atlas coverage ledger",
  "type": "object",
  "required": ["schema_version", "as_of", "method", "status", "rows"],
  "properties": {
    "schema_version": { "const": "0.2.0" },
    "as_of": { "type": "string", "format": "date" },
    "method": { "type": "string", "minLength": 1 },
    "status": { "type": "string", "minLength": 1 },
    "rows": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "required": [
          "source_name",
          "address_attempted",
          "accessed",
          "read_depth",
          "role_in_analysis",
          "report_section",
          "citation",
          "failure_state",
          "failure_citation"
        ],
        "properties": {
          "source_name": { "type": "string", "minLength": 1 },
          "address_attempted": { "type": "string", "minLength": 1 },
          "accessed": { "type": "boolean" },
          "read_depth": { "type": "string", "minLength": 1 },
          "role_in_analysis": { "type": "string", "minLength": 1 },
          "report_section": { "type": "string", "minLength": 1 },
          "citation": { "type": "string", "minLength": 1 },
          "failure_state": { "type": ["string", "null"] },
          "failure_citation": { "type": ["string", "null"] }
        },
        "additionalProperties": false
      }
    }
  },
  "additionalProperties": false
}