Delete row sig_5f82c389becb from signals

id sig_5f82c389becb
event_id evt_b3f2ad2742b6
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_ebab98a46 ...
dedupe_key signal_enriched:news_delta:9f46b8cfcaa1d332
throttle_s 0
created_at 2026-04-20T12:17:04.471176+00:00
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