Delete row sig_62ddcc5b784d from signals

id sig_62ddcc5b784d
event_id evt_4442cac5515c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T23:48:15.353539+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2a7383fd8ad1aac5
throttle_s 0
created_at 2026-04-18T23:48:15.353539+00:00
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