Delete row sig_b1934e56f31a from signals

id sig_b1934e56f31a
event_id evt_f3c7428e30b6
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_d57043900 ...
dedupe_key signal_enriched:news_delta:d48f96f5f33b45ad
throttle_s 0
created_at 2026-04-13T08:10:29.847338+00:00
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