Delete row sig_6dc3dcacc669 from signals

id sig_6dc3dcacc669
event_id evt_464d8230142d
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_731d5587f ...
dedupe_key signal_enriched:news_delta:eccc1d77d03ea464
throttle_s 0
created_at 2026-04-20T06:57:43.719224+00:00
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