Delete row sig_16654956b916 from signals

id sig_16654956b916
event_id evt_c8395e1eafe6
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_81216e161 ...
dedupe_key signal_enriched:news_delta:65a2edfb1d8a260c
throttle_s 0
created_at 2026-04-10T20:50:30.402033+00:00
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