Delete row sig_f1b90300c2e2 from signals

id sig_f1b90300c2e2
event_id evt_d3e6a17fa800
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_41e055414 ...
dedupe_key signal_enriched:news_delta:d83a2ba5376b1499
throttle_s 0
created_at 2026-04-20T13:02:54.576773+00:00
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