Delete row sig_8aca6e2cb184 from signals

id sig_8aca6e2cb184
event_id evt_a4e53ea5f27b
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_60eb71c17 ...
dedupe_key signal_enriched:news_delta:cdcd2628ac4fa6c0
throttle_s 0
created_at 2026-04-18T10:17:55.990906+00:00
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