Delete row sig_b011660489a3 from signals

id sig_b011660489a3
event_id evt_7e6d4aa7719a
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_a3ad5772e ...
dedupe_key signal_enriched:news_delta:a96359a1645a2c7d
throttle_s 0
created_at 2026-04-14T04:15:02.035417+00:00
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