Delete row sig_431c247b1ff9 from signals

id sig_431c247b1ff9
event_id evt_a59c29275045
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_341b2282b ...
dedupe_key signal_enriched:news_delta:5f029f1397cc920b
throttle_s 0
created_at 2026-04-20T10:15:21.781691+00:00
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