Delete row sig_3ab2a3a939bc from signals

id sig_3ab2a3a939bc
event_id evt_078387008123
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_b44fac888 ...
dedupe_key signal_enriched:news_delta:a578d857ce18e7a6
throttle_s 0
created_at 2026-04-21T10:00:50.717089+00:00
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