Delete row sig_b8867a9ea429 from signals

id sig_b8867a9ea429
event_id evt_ee183e2830c6
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_d2c0de765 ...
dedupe_key signal_enriched:news_delta:bc74d7631d196eb8
throttle_s 0
created_at 2026-04-08T10:39:13.869050+00:00
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