Delete row sig_9759dfa76c67 from signals

id sig_9759dfa76c67
event_id evt_290782bec6bf
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_ee9ef94aa ...
dedupe_key signal_enriched:news_delta:d2d1364f8e108f86
throttle_s 0
created_at 2026-04-19T23:01:42.713494+00:00
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