Delete row sig_b195a6dcad99 from signals

id sig_b195a6dcad99
event_id evt_64e063591b3e
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_3e62ef0f1 ...
dedupe_key signal_enriched:news_delta:b34dde93492cdb74
throttle_s 0
created_at 2026-04-10T14:15:34.876678+00:00
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