Delete row sig_56080c283482 from signals

id sig_56080c283482
event_id evt_d856f7e28ea1
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_ae052bce3 ...
dedupe_key signal_enriched:news_delta:08e6ae745217d23f
throttle_s 0
created_at 2026-04-13T06:40:12.905451+00:00
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