Delete row sig_42d20da5fc96 from signals

id sig_42d20da5fc96
event_id evt_60cc107f4f8b
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_ce0ff92f5 ...
dedupe_key signal_enriched:news_delta:6136db205de58a02
throttle_s 0
created_at 2026-04-19T14:09:17.964379+00:00
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