Delete row sig_4237e3692cea from signals

id sig_4237e3692cea
event_id evt_a3f8c8998982
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_cf9718455 ...
dedupe_key signal_enriched:news_delta:cd3a92d036b99e76
throttle_s 0
created_at 2026-04-22T13:17:57.088898+00:00
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