Delete row sig_f8db09cdc955 from signals

id sig_f8db09cdc955
event_id evt_ed99064f7018
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_26af46a37 ...
dedupe_key signal_enriched:news_delta:f761224b2c46b849
throttle_s 0
created_at 2026-04-09T15:51:38.375070+00:00
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