Delete row sig_697138faf794 from signals

id sig_697138faf794
event_id evt_5b7bf9f05cbd
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_2e5634b0f ...
dedupe_key signal_enriched:news_delta:89473abe273fd4da
throttle_s 0
created_at 2026-04-13T01:10:18.819661+00:00
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