Delete row sig_0056fa876459 from signals

id sig_0056fa876459
event_id evt_0d0dad117c54
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_98677e94b ...
dedupe_key signal_enriched:news_delta:82ec017f41d05781
throttle_s 0
created_at 2026-04-17T17:17:12.237219+00:00
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