Delete row sig_e75143fb6f93 from signals

id sig_e75143fb6f93
event_id evt_f6b79ea1b1b6
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_b0d35eb37 ...
dedupe_key signal_enriched:news_delta:8483fce8395d105c
throttle_s 0
created_at 2026-04-20T16:27:42.864704+00:00
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