Delete row sig_f92cdc49e61b from signals

id sig_f92cdc49e61b
event_id evt_1ff278572948
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_cdafc8314 ...
dedupe_key signal_enriched:news_delta:a56bf5df625cc65c
throttle_s 0
created_at 2026-04-13T13:18:39.800604+00:00
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