Delete row sig_150623a5d948 from signals

id sig_150623a5d948
event_id evt_5d7e14e9be62
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_159544029 ...
dedupe_key signal_enriched:news_delta:ba1e46e3504787f4
throttle_s 0
created_at 2026-04-19T12:01:23.152433+00:00
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