Delete row sig_41ffbfdb8112 from signals

id sig_41ffbfdb8112
event_id evt_96c72010897e
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_281189e29 ...
dedupe_key signal_enriched:news_delta:332c35791ace421a
throttle_s 0
created_at 2026-04-20T05:07:23.101002+00:00
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