Delete row sig_501ad979b793 from signals

id sig_501ad979b793
event_id evt_63c3b3d473e6
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_676168e3d ...
dedupe_key signal_enriched:news_delta:957f06106314ed3a
throttle_s 0
created_at 2026-04-21T07:39:48.538715+00:00
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