Delete row sig_2a76133a0135 from signals

id sig_2a76133a0135
event_id evt_55e049524b49
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_240f5671e ...
dedupe_key signal_enriched:news_delta:0880405f53c2873c
throttle_s 0
created_at 2026-04-19T09:39:51.390880+00:00
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