Delete row sig_4e0ea4f4a943 from signals

id sig_4e0ea4f4a943
event_id evt_58ca93acba6a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T02:38:22.712638+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1d464ff8272c1767
throttle_s 0
created_at 2026-04-08T02:38:22.712638+00:00
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