Delete row sig_945d2363cfc3 from signals

id sig_945d2363cfc3
event_id evt_93d62d1aab20
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_ff2f2c84a ...
dedupe_key signal_enriched:news_delta:3bba337ca50c82d6
throttle_s 0
created_at 2026-04-20T05:53:30.345549+00:00
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