Delete row sig_230245193950 from signals

id sig_230245193950
event_id evt_a6e775d27415
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_20d2d1e1f ...
dedupe_key signal_enriched:news_delta:39ede93f38128890
throttle_s 0
created_at 2026-04-22T12:02:09.113952+00:00
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