Delete row sig_61940ba76310 from signals

id sig_61940ba76310
event_id evt_1dbfcac54663
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_3236407ab ...
dedupe_key signal_enriched:news_delta:ca2cc5b068159f74
throttle_s 0
created_at 2026-04-19T00:02:36.149990+00:00
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