Delete row sig_c939cbc5b60b from signals

id sig_c939cbc5b60b
event_id evt_acc5e8cb4e35
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T01:02:30.139497+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5f4aa4b6074b37f5
throttle_s 0
created_at 2026-04-20T01:02:30.139497+00:00
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