{
  "additionalProperties": false,
  "description": "Band specification for technical indicators.\n\nIMPORTANT: 'length' is in BARS, not days. Effective lookback horizon =\ntf \u00d7 length (e.g., 720 bars \u00d7 1h \u2248 30 days, 24 bars \u00d7 1h \u2248 1 day).\nMaximum length is 400 bars.",
  "properties": {
    "anchor": {
      "anyOf": [
        {
          "enum": [
            "session",
            "week",
            "month"
          ],
          "type": "string"
        },
        {
          "type": "null"
        }
      ],
      "default": null,
      "description": "Anchor point for AVWAP-based bands (session/week/month supported)",
      "title": "Anchor"
    },
    "band": {
      "enum": [
        "bollinger",
        "keltner",
        "donchian",
        "vwap_band"
      ],
      "title": "Band",
      "type": "string"
    },
    "length": {
      "description": "Number of BARS for lookback. Must be >=1 for bollinger/keltner/donchian; vwap_band is anchor-driven and accepts 0.",
      "maximum": 400,
      "minimum": 0,
      "title": "Length",
      "type": "integer"
    },
    "mult": {
      "default": 2.0,
      "description": "Standard deviation multiplier",
      "maximum": 5.0,
      "minimum": 0.1,
      "title": "Mult",
      "type": "number"
    }
  },
  "required": [
    "band",
    "length"
  ],
  "title": "BandSpec",
  "type": "object"
}