Delete row sig_fd28a6479c0e from signals

id sig_fd28a6479c0e
event_id evt_d375a30a6562
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_33899a610 ...
dedupe_key signal_enriched:news_delta:1f627d28f87a957c
throttle_s 0
created_at 2026-04-09T03:57:12.084640+00:00
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