Delete row sig_b997bc21f928 from signals

id sig_b997bc21f928
event_id evt_aa7bba0a3895
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_1309dee8e ...
dedupe_key signal_enriched:news_delta:d30e4ba1e67764e2
throttle_s 0
created_at 2026-04-20T00:02:15.146889+00:00
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