Delete row sig_5879699500c2 from signals

id sig_5879699500c2
event_id evt_5ffd351c6583
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_aa57fd6e6 ...
dedupe_key signal_enriched:news_delta:f729a64f11f6673e
throttle_s 0
created_at 2026-04-22T07:12:47.297365+00:00
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