Delete row sig_f75def42461e from signals

id sig_f75def42461e
event_id evt_96f10782fbb0
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_9e1258898 ...
dedupe_key signal_enriched:news_delta:a6a38b6d3c224202
throttle_s 0
created_at 2026-04-18T08:30:57.143119+00:00
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