Delete row sig_14ee290181d1 from signals

id sig_14ee290181d1
event_id evt_fc5750dd7bad
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_f377627ba ...
dedupe_key signal_enriched:news_delta:496d56bddc5b31c0
throttle_s 0
created_at 2026-04-10T14:15:35.271586+00:00
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