Delete row sig_ad10bf735d5b from signals

id sig_ad10bf735d5b
event_id evt_ae7a7cf5f4b2
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_a81bce39b ...
dedupe_key signal_enriched:news_delta:1d2df0721ea218bd
throttle_s 0
created_at 2026-04-22T12:47:29.134022+00:00
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