Delete row sig_5d4a94b5f9c3 from signals

id sig_5d4a94b5f9c3
event_id evt_36fad757f9f0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T06:04:51.998597+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e42d988c63c2c738
throttle_s 0
created_at 2026-04-08T06:04:51.998597+00:00
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