Delete row sig_6a1d90e44c77 from signals

id sig_6a1d90e44c77
event_id evt_09357c399f96
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_a9c04dee0 ...
dedupe_key signal_enriched:news_delta:97e16207fbbbe0ba
throttle_s 0
created_at 2026-04-13T10:19:17.317854+00:00
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