Delete row sig_dfbfe9ba2564 from signals

id sig_dfbfe9ba2564
event_id evt_a3ab7f52c3cf
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_b3164955c ...
dedupe_key signal_enriched:news_delta:2e15b7117437a1fa
throttle_s 0
created_at 2026-04-21T05:31:00.228588+00:00
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