Delete row sig_1307082dfa33 from signals

id sig_1307082dfa33
event_id evt_9f0b2b85740a
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_9ef4b462a ...
dedupe_key signal_enriched:news_delta:25843955c1141fb4
throttle_s 0
created_at 2026-04-18T22:33:11.899539+00:00
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