Delete row sig_6425660eedd5 from signals

id sig_6425660eedd5
event_id evt_812dd9ab316a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T15:51:45.884950+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c415b378759e6a62
throttle_s 0
created_at 2026-04-22T15:51:45.884950+00:00
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