Delete row sig_bf0e221277ff from signals

id sig_bf0e221277ff
event_id evt_d297ecac5fe1
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_d9f43cba8 ...
dedupe_key signal_enriched:news_delta:dc6d5aa0fc72d1f8
throttle_s 0
created_at 2026-04-20T09:28:58.640279+00:00
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