Delete row sig_469a6607b652 from signals

id sig_469a6607b652
event_id evt_5018f97243f4
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_d903a03d6 ...
dedupe_key signal_enriched:news_delta:713a5f251daeb907
throttle_s 0
created_at 2026-04-10T14:15:34.461231+00:00
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