Delete row sig_622b1fa7e262 from signals

id sig_622b1fa7e262
event_id evt_a291a0b334c2
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_b22d80e7a ...
dedupe_key signal_enriched:news_delta:423f94fd193eab52
throttle_s 0
created_at 2026-04-09T16:31:19.725953+00:00
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