{
    "name":"Migration", "title":"Data Model Migrations", "id": 14,
    "source":"migrations", "view":"migrations", "hidden": true, "sealed":true,
    "fields":[
    { "name":"id", "type":"Counter", "primary":true },
    { "name":"appliesTo", "type":"Text", "size":180, "nullable":false },
    { "name":"model", "type":"Text", "size":120 },
    { "name":"description", "type":"Text", "size":512},
    { "name":"version", "type":"Text", "size":40, "nullable":false }
],
    "constraints":[
        { "type":"unique", "fields":[ "appliesTo", "version" ] }
    ]
}