Delete row sig_99206c45b129 from signals

id sig_99206c45b129
event_id evt_f3469ff0c914
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_0b86e01c6 ...
dedupe_key signal_enriched:news_delta:219417fc30f5c4f9
throttle_s 0
created_at 2026-04-11T16:31:47.446461+00:00
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