{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Iteration State",
  "description": "Per-iteration status for resumability tracking",
  "type": "object",
  "required": ["step_id", "total_items", "items"],
  "properties": {
    "step_id": {
      "type": "string"
    },
    "total_items": {
      "type": "integer",
      "minimum": 0
    },
    "completed_items": {
      "type": "integer",
      "minimum": 0
    },
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["index", "status"],
        "properties": {
          "index": { "type": "integer", "minimum": 0 },
          "status": { "type": "string", "enum": ["pending", "running", "completed", "failed", "skipped"] },
          "input": { "type": "string" },
          "error": { "type": "string" },
          "pipeline_run_id": { "type": "string" },
          "started_at": { "type": "string", "format": "date-time" },
          "completed_at": { "type": "string", "format": "date-time" }
        }
      }
    }
  }
}