Delete row sig_910e212fa5e0 from signals

id sig_910e212fa5e0
event_id evt_50aad9e06aac
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_7d8083e94 ...
dedupe_key signal_enriched:news_delta:57482366c80e8423
throttle_s 0
created_at 2026-04-06T20:42:08.636201+00:00
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