Delete row sig_306b70bdc1a7 from signals

id sig_306b70bdc1a7
event_id evt_6cb14461c542
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_183b422cd ...
dedupe_key signal_enriched:news_delta:24577832e16a6421
throttle_s 0
created_at 2026-04-20T21:37:11.229863+00:00
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