Delete row sig_2ff90ebf6c85 from signals

id sig_2ff90ebf6c85
event_id evt_29c32503650b
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_e532d8901 ...
dedupe_key signal_enriched:news_delta:8e3289aa53670026
throttle_s 0
created_at 2026-04-07T23:39:52.265648+00:00
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