Delete row sig_856a4951ef66 from signals

id sig_856a4951ef66
event_id evt_e37d3cf3b405
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_c563f4c49 ...
dedupe_key signal_enriched:news_delta:67db3da45d13375f
throttle_s 0
created_at 2026-04-22T13:17:57.003965+00:00
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