{
  "schema_version": "1.0",
  "provider": "calcofi",
  "dataset": "ctd-derived",
  "primary_keys": {
    "obs": "obs_id",
    "sample_measurement": "sample_measurement_id",
    "measurement_type": "measurement_type",
    "dataset": "dataset_key",
    "ctd_geostrophic": ["cruise_key", "sample_key_1", "sample_key_2", "pressure_min_dbar"]
  },
  "foreign_keys": [
    {
      "table": "obs",
      "column": "measurement_type",
      "ref_table": "measurement_type",
      "ref_column": "measurement_type"
    },
    {
      "table": "sample_measurement",
      "column": "measurement_type",
      "ref_table": "measurement_type",
      "ref_column": "measurement_type"
    }
  ]
}