Delete row sig_930b2426bccf from signals

id sig_930b2426bccf
event_id evt_5c9468a0fbad
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_4edac4562 ...
dedupe_key signal_enriched:news_delta:05eb4b7864fb0890
throttle_s 0
created_at 2026-04-19T14:09:17.828705+00:00
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