Delete row sig_6375f473e6f8 from signals

id sig_6375f473e6f8
event_id evt_f1e21be5f913
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_ab6525300 ...
dedupe_key signal_enriched:news_delta:d7c3f9d0edfa6c5c
throttle_s 0
created_at 2026-04-19T01:31:58.365693+00:00
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