Delete row sig_28e8cdda9930 from signals

id sig_28e8cdda9930
event_id evt_49ffd537cd6a
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_2231b96c7 ...
dedupe_key signal_enriched:news_delta:17a98a299d8ceff6
throttle_s 0
created_at 2026-04-19T09:01:05.710685+00:00
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