Delete row sig_9990a917071d from signals

id sig_9990a917071d
event_id evt_31b2abfee1f8
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_751368c75 ...
dedupe_key signal_enriched:market_headline_delta:82c83fb1e173 ...
throttle_s 0
created_at 2026-04-13T01:48:35.070249+00:00
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