Delete row sig_19d5e19012ea from signals

id sig_19d5e19012ea
event_id evt_cfefb4ab16d5
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_0dd3a0ab8 ...
dedupe_key signal_enriched:news_delta:6371562548c5ce75
throttle_s 0
created_at 2026-04-22T12:17:14.529288+00:00
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