Delete row sig_f27c48956641 from signals

id sig_f27c48956641
event_id evt_b2426446a9f3
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_ec1ac2bad ...
dedupe_key signal_enriched:news_delta:9abb6e05ed4cda37
throttle_s 0
created_at 2026-04-08T01:28:20.774786+00:00
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