Delete row sig_7ff9dd32981c from signals

id sig_7ff9dd32981c
event_id evt_96d495287542
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_19de318e6 ...
dedupe_key signal_enriched:news_delta:f38133e344161a78
throttle_s 0
created_at 2026-04-19T17:09:55.332899+00:00
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