Delete row sig_5a20a5524346 from signals

id sig_5a20a5524346
event_id evt_e9b9374b24d1
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_21a781124 ...
dedupe_key signal_enriched:news_delta:c5ce46b78ebfbc86
throttle_s 0
created_at 2026-04-21T19:56:17.446265+00:00
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