Delete row sig_aa15648ac93b from signals

id sig_aa15648ac93b
event_id evt_b2e2439f9416
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_c94ebac29 ...
dedupe_key signal_enriched:news_delta:3d4eda8f9e8cf7da
throttle_s 0
created_at 2026-04-21T19:16:34.939446+00:00
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