Delete row sig_195d0571ecdc from signals

id sig_195d0571ecdc
event_id evt_ff850d5f28a7
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_d1cfa1ec2 ...
dedupe_key signal_enriched:news_delta:c51a5b8bd339938a
throttle_s 0
created_at 2026-04-09T00:58:24.103156+00:00
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