Delete row sig_266fee30f856 from signals

id sig_266fee30f856
event_id evt_44b9db2f1c25
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_dd62c7feb ...
dedupe_key signal_enriched:news_delta:31976b601d95e6a9
throttle_s 0
created_at 2026-04-21T00:02:03.781794+00:00
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