Delete row sig_3d3a1412567b from signals

id sig_3d3a1412567b
event_id evt_06f28d1e3031
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_037775706 ...
dedupe_key signal_enriched:news_delta:2508c09a1014bdaa
throttle_s 0
created_at 2026-04-11T15:52:30.144151+00:00
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