Delete row sig_dcd5d86bb786 from signals

id sig_dcd5d86bb786
event_id evt_2de87b3d1ad5
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_1ce9a659b ...
dedupe_key signal_enriched:news_delta:9ba9265edb637904
throttle_s 0
created_at 2026-04-08T03:15:56.593360+00:00
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