Delete row sig_5b9c94944108 from signals

id sig_5b9c94944108
event_id evt_5c0aaf55cd91
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_c2c59f528 ...
dedupe_key signal_enriched:news_delta:ac6549b73011f1b9
throttle_s 0
created_at 2026-04-08T12:48:26.499089+00:00
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