Delete row sig_12093b03a2a1 from signals

id sig_12093b03a2a1
event_id evt_c65c54d7ef85
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_501eac79f ...
dedupe_key signal_enriched:news_delta:cf824084de6522d6
throttle_s 0
created_at 2026-04-20T23:24:22.073392+00:00
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