Delete row sig_b1466e942319 from signals

id sig_b1466e942319
event_id evt_d17102d452f7
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_9d7da8904 ...
dedupe_key signal_enriched:news_delta:8de17eb72df7e6a3
throttle_s 0
created_at 2026-04-21T03:02:40.526233+00:00
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