Delete row sig_bbc9fb25f0bc from signals

id sig_bbc9fb25f0bc
event_id evt_dead9f26be39
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_115629df0 ...
dedupe_key signal_enriched:news_delta:d0e5d007ceb59f70
throttle_s 0
created_at 2026-04-18T14:45:41.245006+00:00
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