Delete row sig_c75b1c6eab48 from signals

id sig_c75b1c6eab48
event_id evt_98891ff91a2f
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_373bc3565 ...
dedupe_key signal_enriched:news_delta:99b193320cadd2dc
throttle_s 0
created_at 2026-04-18T23:11:11.021250+00:00
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