Delete row sig_b3ecaf6781f4 from signals

id sig_b3ecaf6781f4
event_id evt_afbc089e0ba1
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_c738ed98b ...
dedupe_key signal_enriched:news_delta:c281ceac6e30de54
throttle_s 0
created_at 2026-04-09T15:01:34.169699+00:00
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