Delete row sig_073b8f54300f from signals

id sig_073b8f54300f
event_id evt_ab6b1a75547a
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_b7c694a91 ...
dedupe_key signal_enriched:news_delta:9e7dccf02235e5d7
throttle_s 0
created_at 2026-04-17T15:36:58.387843+00:00
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