Delete row sig_2d3939f1e972 from signals

id sig_2d3939f1e972
event_id evt_ce9014fd8ad3
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_a989a5423 ...
dedupe_key signal_enriched:news_delta:e7e04f651c0709bf
throttle_s 0
created_at 2026-04-15T05:12:44.819621+00:00
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