Delete row sig_6500adc975c6 from signals

id sig_6500adc975c6
event_id evt_2226e98c8ad7
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_7cc254b1e ...
dedupe_key signal_enriched:news_delta:633b0f2e3d839067
throttle_s 0
created_at 2026-04-17T20:17:18.465501+00:00
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