curl --request GET \
  --url https://api.timbal.ai/orgs/{org_id}/k2/{kb_id}/schema \
  --header 'Authorization: Bearer <token>'

{
  "tables": [
    {
      "columns": [
        {
          "data_type": "<string>",
          "is_nullable": true,
          "name": "<string>"
        }
      ],
      "constraints": [
        {
          "constraint_type": "PRIMARY_KEY",
          "columns": [
            "<string>"
          ],
          "expression": "<string>",
          "foreign_keys": [
            {
              "column": "<string>",
              "ref_column": "<string>",
              "ref_table": "<string>"
            }
          ]
        }
      ],
      "estimated_row_count": 1,
      "indexes": [
        {
          "columns": [
            "<string>"
          ],
          "is_unique": true,
          "name": "<string>",
          "table_name": "<string>"
        }
      ],
      "name": "<string>",
      "source": "primary",
      "schema": "<string>"
    }
  ]
}