Delete row sig_912b4aa4e684 from signals

id sig_912b4aa4e684
event_id evt_bd5679c3cf9a
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_292b16d00 ...
dedupe_key signal_enriched:news_delta:d3a48c203f062b57
throttle_s 0
created_at 2026-04-12T22:11:41.829535+00:00
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