Delete row sig_5b4c758a5425 from signals

id sig_5b4c758a5425
event_id evt_3d40b9d1d5a8
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_27e60b5ac ...
dedupe_key signal_enriched:news_delta:e4a11941d56843ad
throttle_s 0
created_at 2026-04-08T05:04:20.630100+00:00
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