Delete row sig_48019afcae26 from signals

id sig_48019afcae26
event_id evt_12116871fabf
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_b4c332b13 ...
dedupe_key signal_enriched:news_delta:21443eacafbef3e0
throttle_s 0
created_at 2026-04-14T18:05:04.609904+00:00
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