Delete row sig_b3ab935ad373 from signals

id sig_b3ab935ad373
event_id evt_3fc0f22a215d
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_a6fc52658 ...
dedupe_key signal_enriched:news_delta:aac6af4369904b3f
throttle_s 0
created_at 2026-04-20T16:27:42.657068+00:00
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