Delete row sig_120288a39fbc from signals

id sig_120288a39fbc
event_id evt_49b9a768f45c
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_4ebcd6ce8 ...
dedupe_key signal_enriched:news_delta:0dda9193767dd0f6
throttle_s 0
created_at 2026-04-12T07:35:05.814929+00:00
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