Delete row sig_1ae95ab4a8f7 from signals

id sig_1ae95ab4a8f7
event_id evt_198ddf236229
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_1ec5d4c3f ...
dedupe_key signal_enriched:news_delta:77c2e0acc0f5b876
throttle_s 0
created_at 2026-04-21T07:00:36.923429+00:00
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