Delete row sig_8f9f299dc666 from signals

id sig_8f9f299dc666
event_id evt_062202e4b32e
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_ff91d697e ...
dedupe_key signal_enriched:news_delta:76dc8492fa90eebf
throttle_s 0
created_at 2026-04-21T16:42:29.503215+00:00
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