Delete row sig_357add2779f4 from signals

id sig_357add2779f4
event_id evt_b6ec998b7a49
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_418dd9d02 ...
dedupe_key signal_enriched:news_delta:cbada901c8bbaac2
throttle_s 0
created_at 2026-04-21T12:19:49.751985+00:00
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