Delete row sig_b8d9b1fd7599 from signals

id sig_b8d9b1fd7599
event_id evt_2bc9cd79f9e6
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_cdccd9136 ...
dedupe_key signal_enriched:news_delta:1799acfe69bcb466
throttle_s 0
created_at 2026-04-07T14:17:34.700151+00:00
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