Delete row sig_8848d6f030f8 from signals

id sig_8848d6f030f8
event_id evt_e6722ac2051f
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_a28baab38 ...
dedupe_key signal_enriched:news_delta:c6f07d84a7e25c0b
throttle_s 0
created_at 2026-04-07T23:23:38.554724+00:00
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