Delete row sig_d923d6cee19d from signals

id sig_d923d6cee19d
event_id evt_28180dee1135
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_92cbb512c ...
dedupe_key signal_enriched:news_delta:c2c9c374c911536b
throttle_s 0
created_at 2026-04-13T06:40:12.797776+00:00
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