Delete row sig_12750cdc3d98 from signals

id sig_12750cdc3d98
event_id evt_067d1120bec8
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_2cdac075e ...
dedupe_key signal_enriched:news_delta:2a138b84b72ab055
throttle_s 0
created_at 2026-04-06T15:00:06.737296+00:00
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