Delete row sig_bd30c1806daf from signals

id sig_bd30c1806daf
event_id evt_0621a60ad18b
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_e80be0566 ...
dedupe_key signal_enriched:news_delta:ce0b3c0b9696a501
throttle_s 0
created_at 2026-04-13T11:10:14.254293+00:00
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