Delete row sig_5bb60c0cac62 from signals

id sig_5bb60c0cac62
event_id evt_ed692545947b
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_92e89246f ...
dedupe_key signal_enriched:news_delta:c23f33b0f38dc469
throttle_s 0
created_at 2026-04-21T19:56:17.580356+00:00
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