Delete row sig_1cabb4a2b2a5 from signals

id sig_1cabb4a2b2a5
event_id evt_050d8fd78d66
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_4f6b22d4e ...
dedupe_key signal_enriched:news_delta:bda8957ce684971c
throttle_s 0
created_at 2026-04-20T21:37:11.282690+00:00
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