Delete row sig_acff5a38d964 from signals

id sig_acff5a38d964
event_id evt_294d4b948f89
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_a48574b90 ...
dedupe_key signal_enriched:news_delta:7dabcc97f24f7ef9
throttle_s 0
created_at 2026-04-16T13:45:43.731784+00:00
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