Delete row sig_e339598c2830 from signals

id sig_e339598c2830
event_id evt_7be860344ec2
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_a7c23c0ed ...
dedupe_key signal_enriched:news_delta:71f83193d976a075
throttle_s 0
created_at 2026-04-20T10:45:38.785910+00:00
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