Delete row sig_b45e2640ba97 from signals

id sig_b45e2640ba97
event_id evt_6f49f0534aa2
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_22a0c147c ...
dedupe_key signal_enriched:market_headline_delta:a8f5bd0a209a ...
throttle_s 0
created_at 2026-04-18T23:11:09.956099+00:00
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