Delete row sig_b8acafbd0869 from signals

id sig_b8acafbd0869
event_id evt_7c35a1d13786
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_dc4d636a0 ...
dedupe_key signal_enriched:news_delta:e126abc46acf3c86
throttle_s 0
created_at 2026-04-06T15:38:20.637846+00:00
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