Delete row sig_75a98f71cc60 from signals

id sig_75a98f71cc60
event_id evt_b1a2db93728d
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_7b7d7a7d8 ...
dedupe_key signal_enriched:news_delta:4477215137986cd1
throttle_s 0
created_at 2026-04-07T06:53:57.573933+00:00
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