studies:
{
	...
	alerts:
	[
		{
			_id: ...,
			email: ...,
			filters:
			[
				{
					// field filter
					type: 0,
					fieldName: ...,
					operator: ...,
					value: ...
				},
				{
					// question filter
					type: 1,
					questionId: ...,
					questionOrder: ...,
					stubId: ...,
					stubOrder: ...
				}
			]
		}
	]
}