Delete row sig_a1ab30ac4e04 from signals

id sig_a1ab30ac4e04
event_id evt_5196b46a5af8
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_94617a09f ...
dedupe_key signal_enriched:news_delta:8619ef8b8ce87311
throttle_s 0
created_at 2026-04-18T11:03:21.223006+00:00
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