Delete row sig_9f25e23e93ac from signals

id sig_9f25e23e93ac
event_id evt_d4857c55d044
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_515d6993a ...
dedupe_key signal_enriched:news_delta:d3cdf0fd92e40b02
throttle_s 0
created_at 2026-04-19T13:31:32.388929+00:00
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