Delete row sig_92ce75661242 from signals

id sig_92ce75661242
event_id evt_c32abd3060c5
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_cca230003 ...
dedupe_key signal_enriched:news_delta:746677b17895b89e
throttle_s 0
created_at 2026-04-17T23:34:43.613667+00:00
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