Delete row sig_b56092bc5b63 from signals

id sig_b56092bc5b63
event_id evt_82aa3797ec31
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_a2cd5b34c ...
dedupe_key signal_enriched:news_delta:fe81df13708e4afc
throttle_s 0
created_at 2026-04-18T07:15:19.141210+00:00
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