Delete row sig_6a405fac9635 from signals

id sig_6a405fac9635
event_id evt_5d0e288dc26f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-06T21:35:52.496223+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d3d581be2d509727
throttle_s 0
created_at 2026-04-06T21:35:52.496223+00:00
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