Delete row sig_d892861b838f from signals

id sig_d892861b838f
event_id evt_2dbdb15d3838
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_3e4f52d25 ...
dedupe_key signal_enriched:news_delta:a379412ac42a0755
throttle_s 0
created_at 2026-04-12T07:50:13.710229+00:00
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