Delete row sig_e2876fb27007 from signals

id sig_e2876fb27007
event_id evt_8e38599ecfa9
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_f0caf51d7 ...
dedupe_key signal_enriched:news_delta:719234c9504ae779
throttle_s 0
created_at 2026-04-20T07:12:46.406806+00:00
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