Delete row sig_b1b7ca55069e from signals

id sig_b1b7ca55069e
event_id evt_a186d492a83f
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_9dc4b7b19 ...
dedupe_key signal_enriched:news_delta:e218bb2c63af24c6
throttle_s 0
created_at 2026-04-17T09:00:15.433042+00:00
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