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Leave empty to auto-enumerate common niches.", "items": { "type": "string" } }, "minSubscribers": { "title": "Min subscribers / 最少订阅", "minimum": 0, "type": "integer", "description": "只保留订阅数 ≥ 该值的频道。0 = 不限。Only keep channels with at least this many subscribers. 0 = no minimum.", "default": 0 }, "maxSubscribers": { "title": "Max subscribers / 最多订阅", "minimum": 0, "type": "integer", "description": "只保留订阅数 ≤ 该值的频道（适合找腰部/微达人）。0 = 不限。Only keep channels with at most this many subscribers. 0 = no maximum.", "default": 0 }, "maxChannelsPerKeyword": { "title": "Max channels per keyword / 每词最多频道数", "minimum": 1, "maximum": 200, "type": "integer", "description": "每个原始关键词最多返回的去重有效频道数，而不是原始候选数；Actor 会持续翻页并检查公开联系方式，直到达到该数量或搜索源耗尽。Maximum unique qualifying channels returned per original keyword, not raw candidates; discovery continues until this cap is reached or the bounded source is exhausted. For Apify Free-plan users, a separate global limit of 50 dataset rows per run applies regardless of this field. Paid-plan users are not subject to that developer-set 50-row limit.", "default": 30 }, "keywordExpansion": { "title": "Related keyword expansion / 相关关键词扩搜", "enum": [ "auto", "broad", "off" ], "type": "string", "description": "When the original search does not fill the requested output count, derive closely related searches from a curated niche map and live YouTube autocomplete. Auto is recommended. Broad mixes more live suggestions for recall. Off searches only the original keywords.", "default": "auto" }, "maxRelatedKeywords": { "title": "Max related keywords / 最多联想词", "minimum": 1, "maximum": 10, "type": "integer", "description": "Maximum related searches derived for each original keyword. 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