Delete row sig_51356a6f28b5 from signals

id sig_51356a6f28b5
event_id evt_c236981c1fc0
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_dbf9b845a ...
dedupe_key signal_enriched:news_delta:86524cf1aabf6c16
throttle_s 0
created_at 2026-04-07T00:26:15.789561+00:00
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