Delete row sig_15a7af630a7a from signals

id sig_15a7af630a7a
event_id evt_efb49bbea0c0
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_3f6704ee0 ...
dedupe_key signal_enriched:news_delta:8126973436987a08
throttle_s 0
created_at 2026-04-14T09:18:53.846455+00:00
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