Delete row sig_5a349432570a from signals

id sig_5a349432570a
event_id evt_2e91c6bd5991
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_f7ee9cf74 ...
dedupe_key signal_enriched:news_delta:7b171590db6f0d60
throttle_s 0
created_at 2026-04-08T03:15:56.530367+00:00
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