Delete row sig_b1f5129145de from signals

id sig_b1f5129145de
event_id evt_bd9a2d7edac3
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_d37e4880f ...
dedupe_key signal_enriched:news_delta:8f7d2803c7069d2b
throttle_s 0
created_at 2026-04-17T10:29:01.760044+00:00
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