{
  "1": {
    "method": "dropIndex",
    "params": [
      "core_achievements_log_milestones",
      "lookup"
    ]
  },
  "2": {
    "method": "addColumn",
    "params": [
      "core_achievements_log_milestones",
      {
        "name": "milestone_type",
        "type": "VARCHAR",
        "length": 100,
        "decimals": null,
        "values": null,
        "allow_null": true,
        "default": "subject",
        "comment": "",
        "unsigned": false,
        "auto_increment": false
      }
    ]
  },
  "3": {
    "method": "addIndex",
    "params": [
      "core_achievements_log_milestones",
      {
        "type": "unique",
        "name": "lookup",
        "columns": [
          "milestone_member_id",
          "milestone_rule",
          "milestone_type"
        ],
        "length": [
          null,
          null,
          null
        ]
      }
    ]
  },
  "4": {
    "method": "delete",
    "params": [
      "core_notifications",
      [
        "notification_app=? AND notification_key=?",
        "core",
        "best_answer"
      ]
    ]
  }
}