Delete row sig_b4977363c9cb from signals

id sig_b4977363c9cb
event_id evt_d98d03403ee5
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_7d4c0196e ...
dedupe_key signal_enriched:news_delta:f4f56e9013361e19
throttle_s 0
created_at 2026-04-19T23:32:01.490471+00:00
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