Delete row sig_b1e39af1824c from signals

id sig_b1e39af1824c
event_id evt_8cc8bf777d9e
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_ed5ab588b ...
dedupe_key signal_enriched:news_delta:f95349e070058794
throttle_s 0
created_at 2026-04-07T04:04:22.044219+00:00
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