Delete row sig_91963fddedf7 from signals

id sig_91963fddedf7
event_id evt_ff26bf5f837d
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_dea97cf15 ...
dedupe_key signal_enriched:news_delta:fc0b05383bbc00cf
throttle_s 0
created_at 2026-04-07T23:23:39.098378+00:00
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