Delete row sig_ff945916365b from signals

id sig_ff945916365b
event_id evt_ffbab97b9631
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_d173b4b14 ...
dedupe_key signal_enriched:news_delta:52f97e7b07351933
throttle_s 0
created_at 2026-04-10T15:03:23.165881+00:00
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