Delete row sig_0ddca41540b7 from signals

id sig_0ddca41540b7
event_id evt_773371896ddb
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T01:23:21.821737+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7d9ce2e69f6b1d90
throttle_s 0
created_at 2026-04-09T01:23:21.821737+00:00
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