Delete row sig_6c420f03d01f from signals

id sig_6c420f03d01f
event_id evt_36a6fad98250
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T05:49:31.517713+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7cebc6e107ec60ef
throttle_s 0
created_at 2026-04-18T05:49:31.517713+00:00
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