{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://coulomb.social/resource-control/monthly-resource-observation.schema.json",
  "title": "Monthly resource forecast or technical usage observation",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "schema_version",
    "record_type",
    "workload",
    "cost_attribution_key",
    "provider_id",
    "created_at",
    "rows"
  ],
  "properties": {
    "schema_version": {
      "enum": [
        "0.1",
        "0.2"
      ],
      "description": "0.2 permits null cost fields for periods the provider has not yet invoiced. Existing 0.1 records stay valid and are never rewritten."
    },
    "record_type": {
      "enum": [
        "forecast",
        "usage_observation"
      ]
    },
    "workload": {
      "type": "string"
    },
    "cost_attribution_key": {
      "type": "string"
    },
    "provider_id": {
      "type": "string"
    },
    "created_at": {
      "type": "string",
      "format": "date-time"
    },
    "scenario": {
      "type": [
        "string",
        "null"
      ]
    },
    "forecast_ref": {
      "type": [
        "string",
        "null"
      ]
    },
    "rows": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [
          "period",
          "database_gb",
          "stored_gb",
          "wal_gb",
          "restore_egress_gb",
          "write_requests",
          "read_requests",
          "infrastructure_eur",
          "internal_labor_hours",
          "internal_labor_eur",
          "total_eur"
        ],
        "properties": {
          "period": {
            "type": "string",
            "pattern": "^[0-9]{4}-(0[1-9]|1[0-2])$"
          },
          "database_gb": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "Null when the period's evidence does not separate or measure this proxy. Null is unknown, never zero."
          },
          "stored_gb": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "Null when the period's evidence does not separate or measure this proxy. Null is unknown, never zero."
          },
          "wal_gb": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "Null when the period's evidence does not separate or measure this proxy. Null is unknown, never zero."
          },
          "restore_egress_gb": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "Null when the period's evidence does not separate or measure this proxy. Null is unknown, never zero."
          },
          "write_requests": {
            "type": [
              "integer",
              "null"
            ],
            "minimum": 0,
            "description": "Null when no request metric is available for the period. Null is unknown, never zero."
          },
          "read_requests": {
            "type": [
              "integer",
              "null"
            ],
            "minimum": 0,
            "description": "Null when no request metric is available for the period. Null is unknown, never zero."
          },
          "infrastructure_eur": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "EUR, or null when no invoice or valued time record exists for the period. Null is unknown, never zero."
          },
          "internal_labor_hours": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "Null when no time record exists for the period. Null is unknown, never zero."
          },
          "internal_labor_eur": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "EUR, or null when no invoice or valued time record exists for the period. Null is unknown, never zero."
          },
          "total_eur": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "description": "EUR, or null when no invoice or valued time record exists for the period. Null is unknown, never zero."
          },
          "backup_success_pct": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0,
            "maximum": 100
          },
          "restore_rto_minutes": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0
          },
          "max_rpo_minutes": {
            "type": [
              "number",
              "null"
            ],
            "minimum": 0
          },
          "evidence": {
            "type": "array",
            "items": {
              "type": "string"
            }
          },
          "measurement_gaps": {
            "type": "array",
            "items": {
              "type": "string"
            },
            "uniqueItems": true,
            "description": "Named reasons a proxy is null, each attributable to an owner or a missing source."
          }
        }
      }
    },
    "evidence": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "uniqueItems": true,
      "description": "Non-secret references to the provider usage export or invoice, the database and CNPG measurement, the restore drill record, and any internal time record."
    },
    "notes": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "Conditions a reader needs to interpret the row correctly, such as a partial first period."
    }
  }
}