Delete row sig_d40ba9a74986 from signals

id sig_d40ba9a74986
event_id evt_49af688f3a28
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T03:21:38.905704+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:19807596f690117c
throttle_s 0
created_at 2026-04-10T03:21:38.905704+00:00
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