Delete row sig_e51e1277e426 from signals

id sig_e51e1277e426
event_id evt_b01b9f5b3928
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_3ae12ba36 ...
dedupe_key signal_enriched:news_delta:e9121a4616fed08a
throttle_s 0
created_at 2026-04-09T01:37:47.362693+00:00
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