Delete row sig_549844cf43fc from signals

id sig_549844cf43fc
event_id evt_ebcedb407be1
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_66e69d913 ...
dedupe_key signal_enriched:news_delta:193709099d0a77fb
throttle_s 0
created_at 2026-04-20T11:00:44.912910+00:00
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