Delete row sig_a1149d53045d from signals

id sig_a1149d53045d
event_id evt_ce3ac2072d1f
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_34b37a525 ...
dedupe_key signal_enriched:news_delta:ca2550852ccf2eec
throttle_s 0
created_at 2026-04-22T15:19:29.455568+00:00
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