Delete row sig_afbc80329958 from signals

id sig_afbc80329958
event_id evt_fbc19290e315
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_92e381c7c ...
dedupe_key signal_enriched:news_delta:ecb2498e2bf5d52d
throttle_s 0
created_at 2026-04-07T02:56:08.010412+00:00
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