Delete row sig_90f2656edcda from signals

id sig_90f2656edcda
event_id evt_4008af82aebe
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_ba7e0d109 ...
dedupe_key signal_enriched:news_delta:465529438a0e26fb
throttle_s 0
created_at 2026-04-13T10:19:17.302726+00:00
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