Delete row sig_437a3cf31569 from signals

id sig_437a3cf31569
event_id evt_1652e25cc96b
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_af35e1e75 ...
dedupe_key signal_enriched:news_delta:7dabb8c0d9982389
throttle_s 0
created_at 2026-04-19T09:01:05.726460+00:00
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