Delete row sig_abd55f5efcb0 from signals

id sig_abd55f5efcb0
event_id evt_9703aac3c679
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_bfa47968e ...
dedupe_key signal_enriched:news_delta:0f8d32993675fa64
throttle_s 0
created_at 2026-04-17T04:27:44.308433+00:00
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