Delete row sig_75e6042ee859 from signals

id sig_75e6042ee859
event_id evt_2d1e3c4c4875
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_2843ac852 ...
dedupe_key signal_enriched:news_delta:dcc2090a53c97915
throttle_s 0
created_at 2026-04-14T11:50:16.937643+00:00
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