Delete row sig_9c1cde969f66 from signals

id sig_9c1cde969f66
event_id evt_a631d528ed46
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_a5bbbc714 ...
dedupe_key signal_enriched:news_delta:51b30702225a9f1f
throttle_s 0
created_at 2026-04-06T17:07:35.452625+00:00
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