Delete row sig_3a1ac4094af1 from signals

id sig_3a1ac4094af1
event_id evt_55183ca99d8e
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_9773d9388 ...
dedupe_key signal_enriched:news_delta:796cf3b2b1d6c8e1
throttle_s 0
created_at 2026-04-18T21:03:17.026731+00:00
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