Delete row sig_4cde1d39478a from signals

id sig_4cde1d39478a
event_id evt_113f0c15b09e
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_86934fa92 ...
dedupe_key signal_enriched:news_delta:6385747f0ad77e01
throttle_s 0
created_at 2026-04-20T02:34:40.257296+00:00
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