Delete row sig_756dfea82d1d from signals

id sig_756dfea82d1d
event_id evt_2a8edea893fb
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_57fe2f4fc ...
dedupe_key signal_enriched:news_delta:977ba119d186bdab
throttle_s 0
created_at 2026-04-10T12:07:32.402015+00:00
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