Delete row sig_015b2e77250c from signals

id sig_015b2e77250c
event_id evt_9fe7a6666bae
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_556ac3185 ...
dedupe_key signal_enriched:news_delta:b98c2c1edaabff7d
throttle_s 0
created_at 2026-04-20T08:43:35.825993+00:00
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