Delete row sig_3c6793d1dcbf from signals

id sig_3c6793d1dcbf
event_id evt_f5dcf8948a16
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_03f7cd5a9 ...
dedupe_key signal_enriched:news_delta:6a269ba4131c2029
throttle_s 0
created_at 2026-04-06T21:50:13.482080+00:00
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