Delete row sig_1cf2b7192200 from signals

id sig_1cf2b7192200
event_id evt_1f83a81e4a26
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_1bd90e274 ...
dedupe_key signal_enriched:news_delta:4f069444d9680c9c
throttle_s 0
created_at 2026-04-22T13:17:57.092307+00:00
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