Delete row sig_0b1a526da093 from signals

id sig_0b1a526da093
event_id evt_86df5da3db2f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T05:47:11.357756+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9af9860a2b5a122a
throttle_s 0
created_at 2026-04-12T05:47:11.357756+00:00
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