Delete row sig_b477dcdabf29 from signals

id sig_b477dcdabf29
event_id evt_8ccdb69dbe7b
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_26bf9e38c ...
dedupe_key signal_enriched:news_delta:27cb7b63baccae38
throttle_s 0
created_at 2026-04-06T18:37:00.973440+00:00
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