Delete row sig_f6754eea2fe1 from signals

id sig_f6754eea2fe1
event_id evt_4511862af261
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_a81321a2b ...
dedupe_key signal_enriched:news_delta:6550a3626112301d
throttle_s 0
created_at 2026-04-14T10:34:33.643799+00:00
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