Delete row sig_99176df8c52c from signals

id sig_99176df8c52c
event_id evt_f0bdec1e7392
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_44facf2d2 ...
dedupe_key signal_enriched:news_delta:01214446e04321cc
throttle_s 0
created_at 2026-04-19T23:32:01.695397+00:00
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