Delete row sig_105869bc49e5 from signals

id sig_105869bc49e5
event_id evt_da77c6c46ca1
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_7048f7d51 ...
dedupe_key signal_enriched:news_delta:b31f428b7ceea137
throttle_s 0
created_at 2026-04-18T05:29:26.830413+00:00
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