Delete row sig_f886f9a90d8d from signals

id sig_f886f9a90d8d
event_id evt_f4df5e20007f
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_5687b3f4c ...
dedupe_key signal_enriched:news_delta:209492e8c61503ac
throttle_s 0
created_at 2026-04-19T22:00:25.252757+00:00
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