Delete row sig_1b5a8aa08553 from signals

id sig_1b5a8aa08553
event_id evt_1a06683c9799
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_68d9ff7ac ...
dedupe_key signal_enriched:news_delta:fd46bc85acd8b0fb
throttle_s 0
created_at 2026-04-20T03:50:23.905129+00:00
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