Delete row sig_b49f9a6b41ff from signals

id sig_b49f9a6b41ff
event_id evt_d9c4b2d2f63f
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_eb80f0ccc ...
dedupe_key signal_enriched:news_delta:1aa33cd9d2f25b18
throttle_s 0
created_at 2026-04-13T05:10:34.418148+00:00
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