Delete row sig_f1b0c7698d49 from signals

id sig_f1b0c7698d49
event_id evt_c53bc91442b5
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_dd4e2a63a ...
dedupe_key signal_enriched:news_delta:e22166c519f2109e
throttle_s 0
created_at 2026-04-20T09:44:04.672957+00:00
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