Delete row sig_4c76a1b72926 from signals

id sig_4c76a1b72926
event_id evt_7106a34ff932
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_e8512d247 ...
dedupe_key signal_enriched:news_delta:79459a2d3d1e7208
throttle_s 0
created_at 2026-04-17T17:17:12.339411+00:00
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