Delete row sig_aec100a73f4d from signals

id sig_aec100a73f4d
event_id evt_190e43126ec8
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_693cc9924 ...
dedupe_key signal_enriched:news_delta:b9d8dddfdf46df55
throttle_s 0
created_at 2026-04-06T15:00:06.804020+00:00
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