Delete row sig_a53eb7e56339 from signals

id sig_a53eb7e56339
event_id evt_4b9c7858c368
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_a888f61a0 ...
dedupe_key signal_enriched:news_delta:4014cde4651c3b41
throttle_s 0
created_at 2026-04-19T17:09:55.225657+00:00
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