Delete row sig_a75366c6a861 from signals

id sig_a75366c6a861
event_id evt_eb0c77abba99
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_749b00705 ...
dedupe_key signal_enriched:news_delta:26a651151193f606
throttle_s 0
created_at 2026-04-13T19:00:27.348594+00:00
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