Delete row sig_651892c88f01 from signals

id sig_651892c88f01
event_id evt_9a7cacd23ff3
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_dd30c3cf4 ...
dedupe_key signal_enriched:news_delta:5d15567e948d0255
throttle_s 0
created_at 2026-04-19T14:09:17.798024+00:00
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