Delete row sig_857abf697b17 from signals

id sig_857abf697b17
event_id evt_3f5aa0b04aef
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_deba51cd8 ...
dedupe_key signal_enriched:news_delta:88c4b795c65ce706
throttle_s 0
created_at 2026-04-18T07:30:26.504766+00:00
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