Delete row sig_b2c71a16319b from signals

id sig_b2c71a16319b
event_id evt_a4da4a409559
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_869997f0b ...
dedupe_key signal_enriched:news_delta:5070ca739ef245b2
throttle_s 0
created_at 2026-04-10T03:30:53.054417+00:00
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