Delete row sig_9e64a2c3b2c4 from signals

id sig_9e64a2c3b2c4
event_id evt_6454d4eb524b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T00:43:58.835267+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e71de77d81ccf904
throttle_s 0
created_at 2026-04-09T00:43:58.835267+00:00
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