Delete row sig_708377b46286 from signals

id sig_708377b46286
event_id evt_744d8e7df747
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_0e3b3959e ...
dedupe_key signal_enriched:news_delta:49ee74f23cdd0b8f
throttle_s 0
created_at 2026-04-15T18:57:35.286922+00:00
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