Delete row sig_75b760f60270 from signals

id sig_75b760f60270
event_id evt_c28e2e5e01f0
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_d9e165807 ...
dedupe_key signal_enriched:news_delta:922d2105dc33fd7a
throttle_s 0
created_at 2026-04-08T12:09:43.438034+00:00
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