Delete row sig_56a8a5a5e51c from signals

id sig_56a8a5a5e51c
event_id evt_749e0e85e140
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_7a2b23ca9 ...
dedupe_key signal_enriched:news_delta:0c3597fa4646b9c4
throttle_s 0
created_at 2026-04-09T23:03:22.010583+00:00
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