Delete row sig_09f2821c9089 from signals

id sig_09f2821c9089
event_id evt_d75e6f4030f5
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T18:37:49.392604+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6167e752781aa66a
throttle_s 0
created_at 2026-04-11T18:37:49.392604+00:00
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