Delete row sig_3b6ad2826258 from signals

id sig_3b6ad2826258
event_id evt_56c13e27713b
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_e90bdf47e ...
dedupe_key signal_enriched:news_delta:5a75ea30d508b585
throttle_s 0
created_at 2026-04-17T04:27:44.074523+00:00
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