Delete row sig_a859e1315a37 from signals

id sig_a859e1315a37
event_id evt_449569756001
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_7221f777b ...
dedupe_key signal_enriched:news_delta:e0bd88177f8da7c0
throttle_s 0
created_at 2026-04-10T22:35:38.861520+00:00
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