Delete row sig_4597850898b1 from signals

id sig_4597850898b1
event_id evt_933bfb934f16
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_9f5f142c5 ...
dedupe_key signal_enriched:news_delta:c5f4fb078f99b4ba
throttle_s 0
created_at 2026-04-08T05:49:44.140052+00:00
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