Delete row sig_027a5392e963 from signals

id sig_027a5392e963
event_id evt_ed991350d82d
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_8ff894520 ...
dedupe_key signal_enriched:news_delta:8a8ea3fdf5cc68fe
throttle_s 0
created_at 2026-04-20T09:59:20.261939+00:00
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