Delete row sig_51e2f75e2415 from signals

id sig_51e2f75e2415
event_id evt_bd19caf27b79
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_fdf7f4651 ...
dedupe_key signal_enriched:news_delta:f7378de520956bda
throttle_s 0
created_at 2026-04-08T21:48:34.402142+00:00
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