Delete row sig_3ceb378d327e from signals

id sig_3ceb378d327e
event_id evt_1e100ca8e94c
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_fee20ab76 ...
dedupe_key signal_enriched:news_delta:8c7e50c2b92798b7
throttle_s 0
created_at 2026-04-22T13:17:56.999979+00:00
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