Delete row sig_91b77ca7c2d7 from signals

id sig_91b77ca7c2d7
event_id evt_16110c117427
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_9959ccd97 ...
dedupe_key signal_enriched:news_delta:f75542581cb1c251
throttle_s 0
created_at 2026-04-13T05:10:33.926525+00:00
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