Delete row sig_e12970d41c8e from signals

id sig_e12970d41c8e
event_id evt_f6c05a18d750
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_064bb9cf3 ...
dedupe_key signal_enriched:news_delta:22ec6a7b9a7cdbcb
throttle_s 0
created_at 2026-04-14T05:30:51.232461+00:00
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