Delete row sig_606dbacea1a4 from signals

id sig_606dbacea1a4
event_id evt_77d2b7912793
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_47c78187b ...
dedupe_key signal_enriched:news_delta:8e46714777645f44
throttle_s 0
created_at 2026-04-22T04:26:15.703431+00:00
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