Delete row sig_1f9c33e96060 from signals

id sig_1f9c33e96060
event_id evt_8e654397648c
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_649ce0f33 ...
dedupe_key signal_enriched:news_delta:9dfe3523ec963961
throttle_s 0
created_at 2026-04-19T09:39:51.431507+00:00
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