Delete row sig_b1397a7ca77f from signals

id sig_b1397a7ca77f
event_id evt_2cc129854a24
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_b6eefea3c ...
dedupe_key signal_enriched:news_delta:81868ef1834a3ffb
throttle_s 0
created_at 2026-04-20T21:37:11.345209+00:00
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