Delete row sig_2304e26c6e55 from signals

id sig_2304e26c6e55
event_id evt_988e5f19a501
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_6656dee14 ...
dedupe_key signal_enriched:news_delta:08297a561b0289ad
throttle_s 0
created_at 2026-04-21T04:05:36.970838+00:00
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