Delete row sig_49a9dbb3dd3a from signals

id sig_49a9dbb3dd3a
event_id evt_bb53d5c5c1cb
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_968497bb6 ...
dedupe_key signal_enriched:news_delta:90a9361eab7633c1
throttle_s 0
created_at 2026-04-07T06:14:49.328532+00:00
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