Delete row sig_4d13e925546b from signals

id sig_4d13e925546b
event_id evt_f42c7d3abaa2
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_f1dd21ee3 ...
dedupe_key signal_enriched:news_delta:03ed92c8c870b91f
throttle_s 0
created_at 2026-04-19T05:09:15.744273+00:00
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