Delete row sig_b8905c17c796 from signals

id sig_b8905c17c796
event_id evt_c9d930e4c925
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_00c071146 ...
dedupe_key signal_enriched:news_delta:2d687a464d94b756
throttle_s 0
created_at 2026-04-17T21:07:05.289761+00:00
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