Delete row sig_192a08378c5d from signals

id sig_192a08378c5d
event_id evt_5fc795309b74
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_ea2aa7166 ...
dedupe_key signal_enriched:news_delta:8d82968b2ef694d4
throttle_s 0
created_at 2026-04-19T08:08:54.908585+00:00
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