Delete row sig_700739576df8 from signals

id sig_700739576df8
event_id evt_0dc68437f7b4
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_7dcb96e52 ...
dedupe_key signal_enriched:news_delta:5b42647e1b3452fe
throttle_s 0
created_at 2026-04-19T22:16:21.262509+00:00
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