Delete row sig_75663dd3cb18 from signals

id sig_75663dd3cb18
event_id evt_147229e5f727
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_95807e75e ...
dedupe_key signal_enriched:news_delta:6953a4b5a6140ef4
throttle_s 0
created_at 2026-04-19T08:08:54.882999+00:00
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