Delete row sig_b157e6764641 from signals

id sig_b157e6764641
event_id evt_28f859abfc10
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_2a4da577c ...
dedupe_key signal_enriched:news_delta:19125e2a354d3f0f
throttle_s 0
created_at 2026-04-17T21:07:05.379384+00:00
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