Delete row sig_3f3c28e00823 from signals

id sig_3f3c28e00823
event_id evt_d45cba311db4
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_1d797a106 ...
dedupe_key signal_enriched:news_delta:8dc7266ea123ed62
throttle_s 0
created_at 2026-04-13T10:19:17.448961+00:00
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