Filter
data class Filter(val ids: Set<String>? = null, val since: Instant? = null, val authors: Set<String>? = null, val kinds: Set<Int>? = null, @Json(name = "#e" ) val eTags: Set<String>? = null, @Json(name = "#p" ) val pTags: Set<String>? = null, @Json(name = "#t" ) val tTags: Set<String>? = null, val limit: Int? = null)
A subscription filter, as defined in nip-01.