Delete row sig_3942eb5ed206 from signals

id sig_3942eb5ed206
event_id evt_9a2183515fae
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_5199453c2 ...
dedupe_key signal_enriched:news_delta:e7eafc13e3629158
throttle_s 0
created_at 2026-04-11T23:10:57.157064+00:00
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