Delete row sig_91490378b30d from signals

id sig_91490378b30d
event_id evt_d28857f8784b
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_f6ca37aa5 ...
dedupe_key signal_enriched:news_delta:7b5aa8e179f6ead0
throttle_s 0
created_at 2026-04-10T04:32:14.761390+00:00
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