Delete row sig_3f436abd3652 from signals

id sig_3f436abd3652
event_id evt_307f9054ada6
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_0b483de51 ...
dedupe_key signal_enriched:news_delta:259564be9d3be016
throttle_s 0
created_at 2026-04-16T05:37:58.639999+00:00
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