Delete row sig_28e9cb2333fa from signals

id sig_28e9cb2333fa
event_id evt_07f2e3998f19
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_6a4695320 ...
dedupe_key signal_enriched:news_delta:1bc2fab511a4ad09
throttle_s 0
created_at 2026-04-19T07:31:03.590235+00:00
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