Delete row sig_b9373501b297 from signals

id sig_b9373501b297
event_id evt_9eafe06db9a9
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_2b5057606 ...
dedupe_key signal_enriched:market_headline_delta:fb9df50199bc ...
throttle_s 0
created_at 2026-04-18T01:37:21.281130+00:00
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