Delete row sig_4bd358001b9d from signals

id sig_4bd358001b9d
event_id evt_5d166078287e
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_a29ef9017 ...
dedupe_key signal_enriched:news_delta:d5fbb1637c8e643e
throttle_s 0
created_at 2026-04-12T19:10:36.485351+00:00
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