Delete row sig_37e694962126 from signals

id sig_37e694962126
event_id evt_e3345a11a831
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_f564599ae ...
dedupe_key signal_enriched:news_delta:a1185df46714fd16
throttle_s 0
created_at 2026-04-17T14:58:09.849310+00:00
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