Delete row sig_107511057173 from signals

id sig_107511057173
event_id evt_7c439d769232
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_d6ae5fa3d ...
dedupe_key signal_enriched:news_delta:bf7d86a40b1760e8
throttle_s 0
created_at 2026-04-09T12:01:21.245301+00:00
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