Delete row sig_bab2ecc3788b from signals

id sig_bab2ecc3788b
event_id evt_315571eb106b
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_d1d8f5e05 ...
dedupe_key signal_enriched:news_delta:b7b09c7ea43b2838
throttle_s 0
created_at 2026-04-13T09:40:13.947996+00:00
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