Delete row sig_753e46ba1282 from signals

id sig_753e46ba1282
event_id evt_09f6b44ac313
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_b6555bf8f ...
dedupe_key signal_enriched:news_delta:68045959a327519a
throttle_s 0
created_at 2026-04-15T21:55:46.335778+00:00
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