Delete row sig_3bda6039921c from signals

id sig_3bda6039921c
event_id evt_8965e9808bb2
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_bb2254052 ...
dedupe_key signal_enriched:news_delta:350867bfadd3dce1
throttle_s 0
created_at 2026-04-06T21:50:13.323965+00:00
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