Delete row sig_5456b3a200b5 from signals

id sig_5456b3a200b5
event_id evt_2b9c28013e53
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_f8524b0a9 ...
dedupe_key signal_enriched:news_delta:beffba5aea2f131f
throttle_s 0
created_at 2026-04-22T15:19:29.595921+00:00
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