Delete row sig_2cb071726afa from signals

id sig_2cb071726afa
event_id evt_8f9c88ae5f79
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_4876339ea ...
dedupe_key signal_enriched:market_headline_delta:0485d44ebc1c ...
throttle_s 0
created_at 2026-04-20T01:55:25.706656+00:00
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