Delete row sig_515bf784901b from signals

id sig_515bf784901b
event_id evt_de055f67a87b
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_107e9559f ...
dedupe_key signal_enriched:news_delta:83c6d70411f966ac
throttle_s 0
created_at 2026-04-18T14:05:04.050514+00:00
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