Delete row sig_75340fab9025 from signals

id sig_75340fab9025
event_id evt_4f6e3a256cab
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_b2ffb97f9 ...
dedupe_key signal_enriched:news_delta:bf2cd43b4940ac5e
throttle_s 0
created_at 2026-04-15T04:33:51.513478+00:00
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