Delete row sig_b2df34a8f21b from signals

id sig_b2df34a8f21b
event_id evt_4bf6c17a9fd9
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_31b055b50 ...
dedupe_key signal_enriched:news_delta:612602c16cdb3ffc
throttle_s 0
created_at 2026-04-19T04:31:33.173476+00:00
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