Delete row sig_3857221a2ccc from signals

id sig_3857221a2ccc
event_id evt_c4f93ebb9867
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_8e485a801 ...
dedupe_key signal_enriched:news_delta:8ae553313cecec26
throttle_s 0
created_at 2026-04-10T10:05:26.145173+00:00
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