Delete row sig_4378ab14c7b6 from signals

id sig_4378ab14c7b6
event_id evt_3b9538ca6822
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_1d7d04bd2 ...
dedupe_key signal_enriched:news_delta:f96a00a037bd1220
throttle_s 0
created_at 2026-04-09T06:55:02.492133+00:00
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