Delete row sig_606a7394ba9a from signals

id sig_606a7394ba9a
event_id evt_bd659e1e6ac3
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_fe459fc12 ...
dedupe_key signal_enriched:news_delta:4614857885a98513
throttle_s 0
created_at 2026-04-07T06:14:49.006021+00:00
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