Delete row sig_141efa7698d3 from signals

id sig_141efa7698d3
event_id evt_5756c0d29595
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_648d67fb8 ...
dedupe_key signal_enriched:news_delta:8fa2a4ad6bb8f8b3
throttle_s 0
created_at 2026-04-20T02:34:40.464497+00:00
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