Delete row sig_959ae3f28acf from signals

id sig_959ae3f28acf
event_id evt_ede09e7a8892
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_c03143a4e ...
dedupe_key signal_enriched:news_delta:3b256f6d4fbbda2c
throttle_s 0
created_at 2026-04-17T14:58:09.869893+00:00
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