Delete row sig_b191a4a89045 from signals

id sig_b191a4a89045
event_id evt_edcb25a7ccf3
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_7b489efca ...
dedupe_key signal_enriched:news_delta:e4d77b57d94bb1a5
throttle_s 0
created_at 2026-04-19T12:01:22.926536+00:00
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