Delete row sig_01515f44f71c from signals

id sig_01515f44f71c
event_id evt_a312d51ec880
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_0ec37d933 ...
dedupe_key signal_enriched:news_delta:dad8b7cb0984637d
throttle_s 0
created_at 2026-04-16T08:09:25.441690+00:00
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