Delete row sig_a53d4d03fe2c from signals

id sig_a53d4d03fe2c
event_id evt_dfe79e1f587a
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_fc2b566ef ...
dedupe_key signal_enriched:news_delta:4ce0d7588c7554e8
throttle_s 0
created_at 2026-04-16T08:54:53.010379+00:00
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