Delete row sig_5525df474387 from signals

id sig_5525df474387
event_id evt_bd2c0ae08384
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T17:47:04.933328+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2ebddf9a430491e5
throttle_s 0
created_at 2026-04-11T17:47:04.933328+00:00
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