Delete row sig_b4e5ac26e3c4 from signals

id sig_b4e5ac26e3c4
event_id evt_5bf67f6e3343
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_914e8a5e6 ...
dedupe_key signal_enriched:news_delta:24cad2bf4bd504b8
throttle_s 0
created_at 2026-04-22T13:33:23.443781+00:00
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