Delete row sig_54216ffbb44f from signals

id sig_54216ffbb44f
event_id evt_634fe45a54a6
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_41a39accb ...
dedupe_key signal_enriched:news_delta:2c3f6072709a5ffb
throttle_s 0
created_at 2026-04-09T00:58:24.279598+00:00
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