Delete row sig_f6347a8f18b2 from signals

id sig_f6347a8f18b2
event_id evt_ca89c14fe282
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_b3672e4bc ...
dedupe_key signal_enriched:news_delta:185e17e62115f059
throttle_s 0
created_at 2026-04-11T18:52:10.808024+00:00
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