Delete row sig_b712560ef78a from signals

id sig_b712560ef78a
event_id evt_d68889b39e4c
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_e6eac6184 ...
dedupe_key signal_enriched:news_delta:57a1285cc5ace964
throttle_s 0
created_at 2026-04-12T10:07:41.097452+00:00
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