Delete row sig_496f2e358048 from signals

id sig_496f2e358048
event_id evt_193f5743a216
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_0058f53e7 ...
dedupe_key signal_enriched:news_delta:9672509fe456c002
throttle_s 0
created_at 2026-04-10T04:17:05.809709+00:00
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