Delete row sig_894066b032cb from signals

id sig_894066b032cb
event_id evt_3b28d6d30174
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T04:51:08.872747+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d3cb6ecae7aa3fd2
throttle_s 0
created_at 2026-04-08T04:51:08.872747+00:00
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