Delete row sig_5dadb7e2f812 from signals

id sig_5dadb7e2f812
event_id evt_b383cf04b644
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_89c704d41 ...
dedupe_key signal_enriched:news_delta:79db151516ea0882
throttle_s 0
created_at 2026-04-16T18:52:56.318370+00:00
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