Delete row sig_4b1b77dba015 from signals

id sig_4b1b77dba015
event_id evt_c12209b60b8f
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_bba7d91c3 ...
dedupe_key signal_enriched:news_delta:f71746a79f9dad5e
throttle_s 0
created_at 2026-04-06T21:50:13.215701+00:00
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