{
  "seed": 20260807,
  "tables": [
    {
      "name": "campaigns",
      "rows": 500,
      "columns": [
        { "name": "campaign_id", "type": "identifier.sequential" },
        {
          "name": "market_size",
          "type": "numeric.currency",
          "params": { "distribution": { "family": "lognormal", "log_mean": 9.0, "log_sd": 0.5 } }
        },
        {
          "name": "ad_spend",
          "type": "numeric.currency",
          "params": { "distribution": { "family": "lognormal", "log_mean": 7.0, "log_sd": 0.6 } }
        },
        {
          "name": "revenue",
          "type": "numeric.currency",
          "params": { "distribution": { "family": "lognormal", "log_mean": 8.5, "log_sd": 0.5 } }
        }
      ],
      "causal": {
        "treatment": "ad_spend",
        "outcome": "revenue",
        "direct_effect": 3.5,
        "confounders": [
          { "name": "market_size", "on_treatment": 0.6, "on_outcome": 2.0 }
        ]
      }
    }
  ]
}