Delete row sig_75f4ded2b13a from signals

id sig_75f4ded2b13a
event_id evt_ed1d5de25382
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_ad19f4798 ...
dedupe_key signal_enriched:news_delta:c838b8617161d7d8
throttle_s 0
created_at 2026-04-20T23:24:21.941866+00:00
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