Delete row sig_9035a922ebbe from signals

id sig_9035a922ebbe
event_id evt_3d704c2fee83
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T22:52:39.510516+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:edbd2585099ac36b
throttle_s 0
created_at 2026-04-19T22:52:39.510516+00:00
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