Delete row sig_148342a2725d from signals

id sig_148342a2725d
event_id evt_78b20eca7fa5
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_21faaa022 ...
dedupe_key signal_enriched:news_delta:62647933b4039021
throttle_s 0
created_at 2026-04-22T11:16:45.388915+00:00
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