Delete row sig_2fc956139dce from signals

id sig_2fc956139dce
event_id evt_5e04a900744f
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_2511df316 ...
dedupe_key signal_enriched:news_delta:a70efb161f73aa1b
throttle_s 0
created_at 2026-04-17T11:58:31.258591+00:00
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