Delete row sig_859be9b8998f from signals

id sig_859be9b8998f
event_id evt_e4596b2783f4
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_57273948f ...
dedupe_key signal_enriched:news_delta:f2d49070a5511002
throttle_s 0
created_at 2026-04-18T08:46:06.806892+00:00
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