Delete row sig_b980bdafb0ed from signals

id sig_b980bdafb0ed
event_id evt_ec3cc08ad981
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_05e738216 ...
dedupe_key signal_enriched:news_delta:77b481382005d693
throttle_s 0
created_at 2026-04-12T22:11:41.782109+00:00
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