Delete row sig_2f3d1b9f33e9 from signals

id sig_2f3d1b9f33e9
event_id evt_f7e8ae521721
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_aa31707f2 ...
dedupe_key signal_enriched:news_delta:61f6f39fb29e4e13
throttle_s 0
created_at 2026-04-18T11:33:38.890270+00:00
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