{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "MeshLLM normalized performance history row",
  "type": "object",
  "required": [
    "schema_version",
    "created_utc",
    "source_sha",
    "cohort_key",
    "cohort",
    "backend_binary_sha256",
    "observed_gpu_state",
    "prompt_count",
    "successful_requests",
    "failed_requests",
    "output_tokens",
    "measured_wall_ms",
    "output_tokens_per_second",
    "ttft_ms_mean",
    "complete",
    "artifact_result"
  ],
  "properties": {
    "schema_version": {"const": 1},
    "created_utc": {"type": "string"},
    "source_sha": {"type": "string", "pattern": "^[0-9a-f]{40}$"},
    "cohort_key": {"type": "string", "pattern": "^[0-9a-f]{64}$"},
    "cohort": {"type": "object"},
    "backend_binary_sha256": {"type": ["string", "null"]},
    "observed_gpu_state": {"type": "object"},
    "prompt_count": {"type": "integer", "minimum": 1},
    "successful_requests": {"type": "integer", "minimum": 0},
    "failed_requests": {"type": "integer", "minimum": 0},
    "output_tokens": {"type": "integer", "minimum": 0},
    "measured_wall_ms": {"type": "number", "minimum": 0},
    "output_tokens_per_second": {"type": "number", "minimum": 0},
    "ttft_ms_mean": {"type": "number", "minimum": 0},
    "complete": {"type": "boolean"},
    "artifact_result": {"type": "string"}
  },
  "additionalProperties": false
}