Delete row sig_169521f22520 from signals

id sig_169521f22520
event_id evt_1b1d66cb75cf
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_f2189dd92 ...
dedupe_key signal_enriched:news_delta:9a8793f84ba76378
throttle_s 0
created_at 2026-04-08T21:48:34.586002+00:00
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