Delete row sig_9c0bf1a5573b from signals

id sig_9c0bf1a5573b
event_id evt_8b5183bfd052
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T04:28:56.328650+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1e7cc9485fa6d0df
throttle_s 0
created_at 2026-04-08T04:28:56.328650+00:00
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