Delete row sig_b3f86efa767c from signals

id sig_b3f86efa767c
event_id evt_bf6b5cb82338
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_638cdaa53 ...
dedupe_key signal_enriched:news_delta:cd50319306d50419
throttle_s 0
created_at 2026-04-21T23:18:19.874329+00:00
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