Delete row sig_db51501a8f2b from signals

id sig_db51501a8f2b
event_id evt_920807c82bfa
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_3b9f0a9a7 ...
dedupe_key signal_enriched:news_delta:9c660b453839061f
throttle_s 0
created_at 2026-04-20T17:59:52.305762+00:00
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