Delete row sig_3a66e110db05 from signals

id sig_3a66e110db05
event_id evt_bfa39efa7a25
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_68c5b5cb6 ...
dedupe_key signal_enriched:news_delta:2df361f81a59d268
throttle_s 0
created_at 2026-04-20T17:14:49.782666+00:00
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