Delete row sig_b4cb90881056 from signals

id sig_b4cb90881056
event_id evt_e10cb6b783ba
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_811473374 ...
dedupe_key signal_enriched:news_delta:b2cc367a4c3de115
throttle_s 0
created_at 2026-04-17T13:27:21.057913+00:00
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