Delete row sig_859f74055174 from signals

id sig_859f74055174
event_id evt_d339b934f61a
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_899b7dab5 ...
dedupe_key signal_enriched:news_delta:65227cc6c2426448
throttle_s 0
created_at 2026-04-22T13:48:27.034187+00:00
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